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gatt/GattCharacteristic.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2006-2020 ARM Limited
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 
19 #ifndef __GATT_CHARACTERISTIC_H__
20 #define __GATT_CHARACTERISTIC_H__
21 
23 
24 #include "ble/gatt/GattAttribute.h"
25 #include "ble/gatt/GattCallbackParamTypes.h"
26 
27 // Forward declare ble::impl::GattServer
28 namespace ble {
29 
30 #if !defined(DOXYGEN_ONLY)
31 namespace impl {
32 class GattServer;
33 }
34 #endif // !defined(DOXYGEN_ONLY)
35 }
36 
37 /**
38  * @addtogroup ble
39  * @{
40  * @addtogroup gatt
41  * @{
42  * @addtogroup server
43  * @{
44  */
45 
46 /**
47  * Representation of a GattServer characteristic.
48  *
49  * A characteristic is a typed value enclosed in a GATT service (GattService).
50  *
51  * @par Type
52  *
53  * The type of the value defines the purpose of the characteristic, and a
54  * UUID represents it. Standard characteristic types may be consulted at
55  * https://www.bluetooth.com/specifications/gatt/characteristics
56  *
57  * @par Supported operations
58  * A set of properties define what client operations the characteristic
59  * supports. See GattServer::Properties_t
60  *
61  * @par Descriptors
62  *
63  * Additional information, such as the unit of the characteristic value, a
64  * description string or a client control point, can be added to the
65  * characteristic.
66  *
67  * See BLUETOOTH SPECIFICATION Version 4.2 [Vol 3, Part G] - 3.3.1.1
68  *
69  * One of the most important types of descriptor is the Client Characteristic
70  * Configuration Descriptor (CCCD) that must be present if the characteristic
71  * properties allow a client to subscribe to updates of the characteristic
72  * value.
73  *
74  * @par Characteristic breakdown
75  *
76  * A characteristic is composed of several GATT attributes (GattAttribute):
77  * - Characteristic declaration: It contains the properties of the
78  * characteristic, its type and the handle of its value.
79  * - Characteristic value: The value of the characteristic.
80  * - Descriptors: A single GATT attribute stores each descriptor.
81  *
82  * When the GattService containing the characteristic is registered in the
83  * GattServer, a unique attribute handle is assigned to the various attributes
84  * of the characteristic. Clients use this handle to interact with the
85  * characteristic. This handle is used locally in GattServer APIs.
86  *
87  * @par Security requirements
88  *
89  * Verification of security requirements happens whenever a client request to
90  * read the characteristic; write it or even register to its updates. Different
91  * requirements may be defined for these three type of operation. As an example:
92  * it is possible to define a characteristic that do not require security to be
93  * read and require an authenticated link to be written.
94  *
95  * By default all security requirements are set to att_security_requirement_t::NONE
96  * except if the characteristic supports signed write; in such case the security
97  * requirement for write operations is set to att_security_requirement_t::UNAUTHENTICATED.
98  *
99  * @note If a peer uses an operation that is not set in the characteristic
100  * properties then the request request is discarded regardless of the security
101  * requirements and current security level. The only exception being signed
102  * write: signed write are converted into regular write without response if
103  * the link is encrypted.
104  */
106 public:
107 
108  /*
109  * Enumeration of characteristic UUID defined by the Bluetooth body.
110  */
111  enum {
112  /**
113  * Not used in actual BLE service.
114  */
115  UUID_BATTERY_LEVEL_STATE_CHAR = 0x2A1B,
116 
117  /**
118  * Not used in actual BLE service.
119  */
120  UUID_BATTERY_POWER_STATE_CHAR = 0x2A1A,
121 
122  /**
123  * Not used in actual BLE service.
124  */
125  UUID_REMOVABLE_CHAR = 0x2A3A,
126 
127  /**
128  * Not used in actual BLE service.
129  */
130  UUID_SERVICE_REQUIRED_CHAR = 0x2A3B,
131 
132  /**
133  * Not used as a characteristic UUID.
134  */
135  UUID_ALERT_CATEGORY_ID_CHAR = 0x2A43,
136 
137  /**
138  * Not used as a characteristic UUID.
139  */
140  UUID_ALERT_CATEGORY_ID_BIT_MASK_CHAR = 0x2A42,
141 
142  /**
143  * Control point of the Immediate Alert service that allows the client to
144  * command the server to alert to a given level.
145  */
146  UUID_ALERT_LEVEL_CHAR = 0x2A06,
147 
148  /**
149  * Control point of the Alert Notification service that allows the client
150  * finely tune the notification configuration.
151  */
152  UUID_ALERT_NOTIFICATION_CONTROL_POINT_CHAR = 0x2A44,
153 
154  /**
155  * Part of the Alert Notification service, which exposes the count of
156  * unread alert events existing in the server.
157  */
158  UUID_ALERT_STATUS_CHAR = 0x2A3F,
159 
160  /**
161  * Characteristic of the Battery service, which exposes the current
162  * battery level as a percentage.
163  */
164  UUID_BATTERY_LEVEL_CHAR = 0x2A19,
165 
166  /**
167  * Describe the features supported by the blood pressure sensor exposed
168  * by the Blood Pressure service.
169  */
170  UUID_BLOOD_PRESSURE_FEATURE_CHAR = 0x2A49,
171 
172  /**
173  * Characteristic of the Blood Pressure service that exposes the
174  * measurement of the blood sensor.
175  */
176  UUID_BLOOD_PRESSURE_MEASUREMENT_CHAR = 0x2A35,
177 
178  /**
179  * Characteristic of the Heart Rate service that indicate the intended
180  * location of the heart rate monitor.
181  */
182  UUID_BODY_SENSOR_LOCATION_CHAR = 0x2A38,
183 
184  /**
185  * Part of the Human Interface Device service.
186  */
187  UUID_BOOT_KEYBOARD_INPUT_REPORT_CHAR = 0x2A22,
188 
189  /**
190  * Part of the Human Interface Device service.
191  */
192  UUID_BOOT_KEYBOARD_OUTPUT_REPORT_CHAR = 0x2A32,
193 
194  /**
195  * Part of the Human Interface Device service.
196  */
197  UUID_BOOT_MOUSE_INPUT_REPORT_CHAR = 0x2A33,
198 
199  /**
200  * Characteristic of the Current Time service that contains the current
201  * time.
202  */
203  UUID_CURRENT_TIME_CHAR = 0x2A2B,
204 
205  /**
206  * Not used in a service as a characteristic.
207  */
208  UUID_DATE_TIME_CHAR = 0x2A08,
209 
210  /**
211  * Not used in a service as a characteristic.
212  */
213  UUID_DAY_DATE_TIME_CHAR = 0x2A0A,
214 
215  /**
216  * Not used in a service as a characteristic.
217  */
218  UUID_DAY_OF_WEEK_CHAR = 0x2A09,
219 
220  /**
221  * Not used in a service as a characteristic.
222  */
223  UUID_DST_OFFSET_CHAR = 0x2A0D,
224 
225  /**
226  * Not used in a service as a characteristic.
227  */
228  UUID_EXACT_TIME_256_CHAR = 0x2A0C,
229 
230  /**
231  * Characteristic of the Device Information Service that contains a
232  * UTF8 string representing the firmware revision for the firmware within
233  * the device.
234  */
235  UUID_FIRMWARE_REVISION_STRING_CHAR = 0x2A26,
236 
237  /**
238  * Characteristic of the Glucose service that exposes features supported
239  * by the server.
240  */
241  UUID_GLUCOSE_FEATURE_CHAR = 0x2A51,
242 
243  /**
244  * Characteristic of the Glucose service that exposes glucose
245  * measurements.
246  */
247  UUID_GLUCOSE_MEASUREMENT_CHAR = 0x2A18,
248 
249  /**
250  * Characteristic of the Glucose service that sends additional
251  * information related to the glucose measurements.
252  */
253  UUID_GLUCOSE_MEASUREMENT_CONTEXT_CHAR = 0x2A34,
254 
255  /**
256  * Characteristic of the Device Information Service that contains a
257  * UTF8 string representing the hardware revision of the device.
258  */
259  UUID_HARDWARE_REVISION_STRING_CHAR = 0x2A27,
260 
261  /**
262  * Characteristic of the Heart Rate service used by the client to control
263  * the service behavior.
264  */
265  UUID_HEART_RATE_CONTROL_POINT_CHAR = 0x2A39,
266 
267  /**
268  * Characteristic of the Heart Rate that sends heart rate measurements to
269  * registered clients.
270  */
271  UUID_HEART_RATE_MEASUREMENT_CHAR = 0x2A37,
272 
273  /**
274  * Part of the Human Interface Device service.
275  */
276  UUID_HID_CONTROL_POINT_CHAR = 0x2A4C,
277 
278  /**
279  * Part of the Human Interface Device service.
280  */
281  UUID_HID_INFORMATION_CHAR = 0x2A4A,
282 
283  /**
284  * Characteristic of the Environmental Sensing service, which exposes
285  * humidity measurements.
286  */
287  UUID_HUMIDITY_CHAR = 0x2A6F,
288 
289  /**
290  * Characteristic of the Device Information Service, which exposes
291  * various regulatory or certification compliance items to which the
292  * device claims adherence.
293  */
294  UUID_IEEE_REGULATORY_CERTIFICATION_DATA_LIST_CHAR = 0x2A2A,
295 
296  /**
297  * Characteristic of the Blood Pressure service, which exposes intermediate
298  * cuff pressure measurements.
299  */
300  UUID_INTERMEDIATE_CUFF_PRESSURE_CHAR = 0x2A36,
301 
302  /**
303  * Characteristic of the Health Thermometer service that sends intermediate
304  * temperature values while the measurement is in progress.
305  */
306  UUID_INTERMEDIATE_TEMPERATURE_CHAR = 0x2A1E,
307 
308  /**
309  * Characteristic of the current Time service that exposes information
310  * about the local time.
311  */
312  UUID_LOCAL_TIME_INFORMATION_CHAR = 0x2A0F,
313 
314  /**
315  * Characteristic of the Device Information Service that contains a
316  * UTF8 string representing the manufacturer name of the device.
317  */
318  UUID_MANUFACTURER_NAME_STRING_CHAR = 0x2A29,
319 
320  /**
321  * Characteristic of the Health Thermometer service that exposes the
322  * interval time between two measurements.
323  */
324  UUID_MEASUREMENT_INTERVAL_CHAR = 0x2A21,
325 
326  /**
327  * Characteristic of the Device Information Service that contains a
328  * UTF8 string representing the model number of the device assigned by
329  * the vendor.
330  */
331  UUID_MODEL_NUMBER_STRING_CHAR = 0x2A24,
332 
333  /**
334  * Characteristic of the Alert Notification Service that shows how many
335  * numbers of unread alerts exist in the specific category in the device.
336  */
337  UUID_UNREAD_ALERT_CHAR = 0x2A45,
338 
339  /**
340  * Characteristic of the Alert Notification Service that defines the
341  * category of the alert and how many new alerts of that category have
342  * occurred in the server.
343  */
344  UUID_NEW_ALERT_CHAR = 0x2A46,
345 
346  /**
347  * Characteristic of the Device Information Service; it is a set of
348  * values used to create a device ID that is unique for this device.
349  */
350  UUID_PNP_ID_CHAR = 0x2A50,
351 
352  /**
353  * Characteristic of the Environmental Sensing Service that exposes the
354  * pressure measured.
355  */
356  UUID_PRESSURE_CHAR = 0x2A6D,
357 
358  /**
359  * Part of the Human Interface Device service.
360  */
361  UUID_PROTOCOL_MODE_CHAR = 0x2A4E,
362 
363  /**
364  * Pulse Oxymeter, Glucose and Continuous Glucose Monitoring services
365  * use this control point to provide basic management of the patient
366  * record database.
367  */
368  UUID_RECORD_ACCESS_CONTROL_POINT_CHAR = 0x2A52,
369 
370  /**
371  * Characteristic of the Current Time service that exposes information
372  * related to the current time served (accuracy, source, hours since
373  * update and so on).
374  */
375  UUID_REFERENCE_TIME_INFORMATION_CHAR = 0x2A14,
376 
377  /**
378  * Part of the Human Interface Device service.
379  */
380  UUID_REPORT_CHAR = 0x2A4D,
381 
382  /**
383  * Part of the Human Interface Device service.
384  */
385  UUID_REPORT_MAP_CHAR = 0x2A4B,
386 
387  /**
388  * Characteristic of the Phone Alert Status service that allows a client
389  * to configure operating mode.
390  */
391  UUID_RINGER_CONTROL_POINT_CHAR = 0x2A40,
392 
393  /**
394  * Characteristic of the Phone Alert Status service that returns the
395  * ringer setting when read.
396  */
397  UUID_RINGER_SETTING_CHAR = 0x2A41,
398 
399  /**
400  * Characteristic of the Scan Parameter service that stores the client's
401  * scan parameters (scan interval and scan window).
402  */
403  UUID_SCAN_INTERVAL_WINDOW_CHAR = 0x2A4F,
404 
405  /**
406  * Characteristic of the Scan Parameter service that sends a notification
407  * to a client when the server requires its latest scan parameters.
408  */
409  UUID_SCAN_REFRESH_CHAR = 0x2A31,
410 
411  /**
412  * Characteristic of the Device Information Service that contains a
413  * UTF8 string representing the serial number of the device.
414  */
415  UUID_SERIAL_NUMBER_STRING_CHAR = 0x2A25,
416 
417  /**
418  * Characteristic of the Device Information Service that contains an
419  * UTF8 string representing the software revision of the device.
420  */
421  UUID_SOFTWARE_REVISION_STRING_CHAR = 0x2A28,
422 
423  /**
424  * Characteristic of the Alert Notification Service that notifies the
425  * count of new alerts for a given category to a subscribed client.
426  */
427  UUID_SUPPORTED_NEW_ALERT_CATEGORY_CHAR = 0x2A47,
428 
429  /**
430  * Characteristic of the Alert Notification service, which exposes
431  * categories of unread alert supported by the server.
432  */
433  UUID_SUPPORTED_UNREAD_ALERT_CATEGORY_CHAR = 0x2A48,
434 
435  /**
436  * Characteristic of the Device Information Service that exposes a
437  * structure containing an Organizationally Unique Identifier (OUI)
438  * followed by a manufacturer-defined identifier. The value of the
439  * structure is unique for each individual instance of the product.
440  */
441  UUID_SYSTEM_ID_CHAR = 0x2A23,
442 
443  /**
444  * Characteristic of the Environmental Sensing service that exposes the
445  * temperature measurement with a resolution of 0.01 degree Celsius.
446  */
447  UUID_TEMPERATURE_CHAR = 0x2A6E,
448 
449  /**
450  * Characteristic of the Health Thermometer service that sends temperature
451  * measurement to clients.
452  */
453  UUID_TEMPERATURE_MEASUREMENT_CHAR = 0x2A1C,
454 
455  /**
456  * Characteristic of the Health Thermometer service that describes
457  * where the measurement takes place.
458  */
459  UUID_TEMPERATURE_TYPE_CHAR = 0x2A1D,
460 
461  /**
462  * Not used in a service as a characteristic.
463  */
464  UUID_TIME_ACCURACY_CHAR = 0x2A12,
465 
466  /**
467  * Not used in a service as a characteristic.
468  */
469  UUID_TIME_SOURCE_CHAR = 0x2A13,
470 
471  /**
472  * Characteristic of the Reference Time service that allows clients to
473  * control time update.
474  */
475  UUID_TIME_UPDATE_CONTROL_POINT_CHAR = 0x2A16,
476 
477  /**
478  * Characteristic of the Reference Time service that informs clients of
479  * the status of the time update operation.
480  */
481  UUID_TIME_UPDATE_STATE_CHAR = 0x2A17,
482 
483  /**
484  * Characteristic of the Next DST Change service that returns to clients
485  * the time with DST.
486  */
487  UUID_TIME_WITH_DST_CHAR = 0x2A11,
488 
489  /**
490  * Not used in a service as a characteristic.
491  */
492  UUID_TIME_ZONE_CHAR = 0x2A0E,
493 
494  /**
495  * Characteristic of the TX Power service that exposes the current
496  * transmission power in dBm.
497  */
498  UUID_TX_POWER_LEVEL_CHAR = 0x2A07,
499 
500  /**
501  * Characteristic of the Cycling Speed and Cadence (CSC) service that
502  * exposes features supported by the server.
503  */
504  UUID_CSC_FEATURE_CHAR = 0x2A5C,
505 
506  /**
507  * Characteristic of the Cycling Speed and Cadence (CSC) service that
508  * exposes measurements made by the server.
509  */
510  UUID_CSC_MEASUREMENT_CHAR = 0x2A5B,
511 
512  /**
513  * Characteristic of the Running Speed and Cadence (RSC) service that
514  * exposes features supported by the server.
515  */
516  UUID_RSC_FEATURE_CHAR = 0x2A54,
517 
518  /**
519  * Characteristic of the Running Speed and Cadence (RSC) service that
520  * exposes measurements made by the server.
521  */
522  UUID_RSC_MEASUREMENT_CHAR = 0x2A53
523  };
524 
525  /**
526  * Unit type of a characteristic value.
527  *
528  * These unit types are used to describe what the raw numeric data in a
529  * characteristic actually represents. A server can expose that information
530  * to its clients by adding a Characteristic Presentation Format descriptor
531  * to relevant characteristics.
532  *
533  * @note See https://developer.bluetooth.org/gatt/units/Pages/default.aspx
534  */
535  enum {
536 
537  /**
538  * No specified unit type.
539  */
540  BLE_GATT_UNIT_NONE = 0x2700,
541 
542  /**
543  * Length, meter.
544  */
545  BLE_GATT_UNIT_LENGTH_METRE = 0x2701,
546 
547  /**
548  * Mass, kilogram.
549  */
550  BLE_GATT_UNIT_MASS_KILOGRAM = 0x2702,
551 
552  /**
553  * Time, second.
554  */
555  BLE_GATT_UNIT_TIME_SECOND = 0x2703,
556 
557  /**
558  * Electric current, ampere.
559  */
560  BLE_GATT_UNIT_ELECTRIC_CURRENT_AMPERE = 0x2704,
561 
562  /**
563  * Thermodynamic temperature, kelvin.
564  */
565  BLE_GATT_UNIT_THERMODYNAMIC_TEMPERATURE_KELVIN = 0x2705,
566 
567  /** Amount of substance, mole.
568  *
569  */
570  BLE_GATT_UNIT_AMOUNT_OF_SUBSTANCE_MOLE = 0x2706,
571 
572  /**
573  * Luminous intensity, candela.
574  */
575  BLE_GATT_UNIT_LUMINOUS_INTENSITY_CANDELA = 0x2707,
576 
577  /**
578  * Area, square meters.
579  */
580  BLE_GATT_UNIT_AREA_SQUARE_METRES = 0x2710,
581 
582  /**
583  * Volume, cubic meters.
584  */
585  BLE_GATT_UNIT_VOLUME_CUBIC_METRES = 0x2711,
586 
587  /**
588  * Velocity, meters per second.
589  */
590  BLE_GATT_UNIT_VELOCITY_METRES_PER_SECOND = 0x2712,
591 
592  /**
593  * Acceleration, meters per second squared.
594  */
595  BLE_GATT_UNIT_ACCELERATION_METRES_PER_SECOND_SQUARED = 0x2713,
596 
597  /**
598  * Wave number reciprocal, meter.
599  */
600  BLE_GATT_UNIT_WAVENUMBER_RECIPROCAL_METRE = 0x2714,
601 
602  /**
603  * Density, kilogram per cubic meter.
604  */
605  BLE_GATT_UNIT_DENSITY_KILOGRAM_PER_CUBIC_METRE = 0x2715,
606 
607  /**
608  * Surface density (kilogram per square meter).
609  */
610  BLE_GATT_UNIT_SURFACE_DENSITY_KILOGRAM_PER_SQUARE_METRE = 0x2716,
611 
612  /**
613  * Specific volume (cubic meter per kilogram).
614  */
615  BLE_GATT_UNIT_SPECIFIC_VOLUME_CUBIC_METRE_PER_KILOGRAM = 0x2717,
616 
617  /**
618  * Current density (ampere per square meter).
619  */
620  BLE_GATT_UNIT_CURRENT_DENSITY_AMPERE_PER_SQUARE_METRE = 0x2718,
621 
622  /**
623  * Magnetic field strength, ampere per meter.
624  */
625  BLE_GATT_UNIT_MAGNETIC_FIELD_STRENGTH_AMPERE_PER_METRE = 0x2719,
626 
627  /**
628  * Amount concentration (mole per cubic meter).
629  */
630  BLE_GATT_UNIT_AMOUNT_CONCENTRATION_MOLE_PER_CUBIC_METRE = 0x271A,
631 
632  /**
633  * Mass concentration (kilogram per cubic meter).
634  */
635  BLE_GATT_UNIT_MASS_CONCENTRATION_KILOGRAM_PER_CUBIC_METRE = 0x271B,
636 
637  /**
638  * Luminance (candela per square meter).
639  */
640  BLE_GATT_UNIT_LUMINANCE_CANDELA_PER_SQUARE_METRE = 0x271C,
641 
642  /**
643  * Refractive index.
644  */
645  BLE_GATT_UNIT_REFRACTIVE_INDEX = 0x271D,
646 
647  /**
648  * Relative permeability.
649  */
650  BLE_GATT_UNIT_RELATIVE_PERMEABILITY = 0x271E,
651 
652  /**
653  * Plane angle (radian).
654  */
655  BLE_GATT_UNIT_PLANE_ANGLE_RADIAN = 0x2720,
656 
657  /**
658  * Solid angle (steradian).
659  */
660  BLE_GATT_UNIT_SOLID_ANGLE_STERADIAN = 0x2721,
661 
662  /**
663  * Frequency, hertz.
664  */
665  BLE_GATT_UNIT_FREQUENCY_HERTZ = 0x2722,
666 
667  /**
668  * Force, newton.
669  */
670  BLE_GATT_UNIT_FORCE_NEWTON = 0x2723,
671 
672  /**
673  * Pressure, pascal.
674  */
675  BLE_GATT_UNIT_PRESSURE_PASCAL = 0x2724,
676 
677  /**
678  * Energy, joule.
679  */
680  BLE_GATT_UNIT_ENERGY_JOULE = 0x2725,
681 
682  /**
683  * Power, watt.
684  */
685  BLE_GATT_UNIT_POWER_WATT = 0x2726,
686 
687  /**
688  * Electrical charge, coulomb.
689  */
690  BLE_GATT_UNIT_ELECTRIC_CHARGE_COULOMB = 0x2727,
691 
692  /**
693  * Electrical potential difference, voltage.
694  */
695  BLE_GATT_UNIT_ELECTRIC_POTENTIAL_DIFFERENCE_VOLT = 0x2728,
696 
697  /**
698  * Capacitance, farad.
699  */
700  BLE_GATT_UNIT_CAPACITANCE_FARAD = 0x2729,
701 
702  /**
703  * Electric resistance, ohm.
704  */
705  BLE_GATT_UNIT_ELECTRIC_RESISTANCE_OHM = 0x272A,
706 
707  /**
708  * Electric conductance, siemens.
709  */
710  BLE_GATT_UNIT_ELECTRIC_CONDUCTANCE_SIEMENS = 0x272B,
711 
712  /**
713  * Magnetic flux, weber.
714  */
715  BLE_GATT_UNIT_MAGNETIC_FLUX_WEBER = 0x272C,
716 
717  /**
718  * Magnetic flux density, tesla.
719  */
720  BLE_GATT_UNIT_MAGNETIC_FLUX_DENSITY_TESLA = 0x272D,
721 
722  /**
723  * Inductance, henry.
724  */
725  BLE_GATT_UNIT_INDUCTANCE_HENRY = 0x272E,
726 
727  /**
728  * Celsius temperature, degree Celsius.
729  */
730  BLE_GATT_UNIT_THERMODYNAMIC_TEMPERATURE_DEGREE_CELSIUS = 0x272F,
731 
732  /**
733  * Luminous flux, lumen.
734  */
735  BLE_GATT_UNIT_LUMINOUS_FLUX_LUMEN = 0x2730,
736 
737  /**
738  * Illuminance, lux.
739  */
740  BLE_GATT_UNIT_ILLUMINANCE_LUX = 0x2731,
741 
742  /**
743  * Activity referred to a radionuclide, becquerel.
744  */
745  BLE_GATT_UNIT_ACTIVITY_REFERRED_TO_A_RADIONUCLIDE_BECQUEREL = 0x2732,
746 
747  /**
748  * Absorbed dose, gray.
749  */
750  BLE_GATT_UNIT_ABSORBED_DOSE_GRAY = 0x2733,
751 
752  /**
753  * Dose equivalent, sievert.
754  */
755  BLE_GATT_UNIT_DOSE_EQUIVALENT_SIEVERT = 0x2734,
756 
757  /**
758  * Catalytic activity, katal.
759  */
760  BLE_GATT_UNIT_CATALYTIC_ACTIVITY_KATAL = 0x2735,
761 
762  /**
763  * Dynamic viscosity, pascal second.
764  */
765  BLE_GATT_UNIT_DYNAMIC_VISCOSITY_PASCAL_SECOND = 0x2740,
766 
767  /**
768  * Moment of force, newton meter.
769  */
770  BLE_GATT_UNIT_MOMENT_OF_FORCE_NEWTON_METRE = 0x2741,
771 
772  /**
773  * Surface tension, newton per meter.
774  */
775  BLE_GATT_UNIT_SURFACE_TENSION_NEWTON_PER_METRE = 0x2742,
776 
777  /**
778  * Angular velocity, radian per second.
779  */
780  BLE_GATT_UNIT_ANGULAR_VELOCITY_RADIAN_PER_SECOND = 0x2743,
781 
782  /**
783  * Angular acceleration, radian per second squared.
784  */
785  BLE_GATT_UNIT_ANGULAR_ACCELERATION_RADIAN_PER_SECOND_SQUARED = 0x2744,
786 
787  /**
788  * Heat flux density, watt per square meter.
789  */
790  BLE_GATT_UNIT_HEAT_FLUX_DENSITY_WATT_PER_SQUARE_METRE = 0x2745,
791 
792  /**
793  * Heat capacity, joule per kelvin.
794  */
795  BLE_GATT_UNIT_HEAT_CAPACITY_JOULE_PER_KELVIN = 0x2746,
796 
797  /**
798  * Specific heat capacity, joule per kilogram kelvin.
799  */
800  BLE_GATT_UNIT_SPECIFIC_HEAT_CAPACITY_JOULE_PER_KILOGRAM_KELVIN = 0x2747,
801 
802  /**
803  * Specific energy, joule per kilogram.
804  */
805  BLE_GATT_UNIT_SPECIFIC_ENERGY_JOULE_PER_KILOGRAM = 0x2748,
806 
807  /**
808  * Thermal conductivity, watt per meter kelvin.
809  */
810  BLE_GATT_UNIT_THERMAL_CONDUCTIVITY_WATT_PER_METRE_KELVIN = 0x2749,
811 
812  /**
813  * Energy density, joule per cubic meter.
814  */
815  BLE_GATT_UNIT_ENERGY_DENSITY_JOULE_PER_CUBIC_METRE = 0x274A,
816 
817  /**
818  * Electric field strength, volt per meter.
819  */
820  BLE_GATT_UNIT_ELECTRIC_FIELD_STRENGTH_VOLT_PER_METRE = 0x274B,
821 
822  /**
823  * Electric charge density, coulomb per cubic meter.
824  */
825  BLE_GATT_UNIT_ELECTRIC_CHARGE_DENSITY_COULOMB_PER_CUBIC_METRE = 0x274C,
826 
827  /**
828  * Surface charge density, coulomb per square meter.
829  */
830  BLE_GATT_UNIT_SURFACE_CHARGE_DENSITY_COULOMB_PER_SQUARE_METRE = 0x274D,
831 
832  /**
833  * Electric flux density, coulomb per square meter.
834  */
835  BLE_GATT_UNIT_ELECTRIC_FLUX_DENSITY_COULOMB_PER_SQUARE_METRE = 0x274E,
836 
837  /**
838  * Permittivity, farad per meter.
839  */
840  BLE_GATT_UNIT_PERMITTIVITY_FARAD_PER_METRE = 0x274F,
841 
842  /**
843  * Permeability, henry per meter.
844  */
845  BLE_GATT_UNIT_PERMEABILITY_HENRY_PER_METRE = 0x2750,
846 
847  /**
848  * Molar energy, joule per mole.
849  */
850  BLE_GATT_UNIT_MOLAR_ENERGY_JOULE_PER_MOLE = 0x2751,
851 
852  /**
853  * Molar entropy, joule per mole kelvin.
854  */
855  BLE_GATT_UNIT_MOLAR_ENTROPY_JOULE_PER_MOLE_KELVIN = 0x2752,
856 
857  /**
858  * Exposure, coulomb per kilogram.
859  */
860  BLE_GATT_UNIT_EXPOSURE_COULOMB_PER_KILOGRAM = 0x2753,
861 
862  /**
863  * Absorbed dose rate, gray per second.
864  */
865  BLE_GATT_UNIT_ABSORBED_DOSE_RATE_GRAY_PER_SECOND = 0x2754,
866 
867  /**
868  * Radiant intensity, watt per steradian.
869  */
870  BLE_GATT_UNIT_RADIANT_INTENSITY_WATT_PER_STERADIAN = 0x2755,
871 
872  /**
873  * Radiance, watt per square meter steradian.
874  */
875  BLE_GATT_UNIT_RADIANCE_WATT_PER_SQUARE_METRE_STERADIAN = 0x2756,
876 
877  /**
878  * Catalytic activity concentration, katal per cubic meter.
879  */
880  BLE_GATT_UNIT_CATALYTIC_ACTIVITY_CONCENTRATION_KATAL_PER_CUBIC_METRE = 0x2757,
881 
882  /**
883  * Time, minute.
884  */
885  BLE_GATT_UNIT_TIME_MINUTE = 0x2760,
886 
887  /**
888  * Time, hour.
889  */
890  BLE_GATT_UNIT_TIME_HOUR = 0x2761,
891 
892  /**
893  * Time, day.
894  */
895  BLE_GATT_UNIT_TIME_DAY = 0x2762,
896 
897  /**
898  * Plane angle, degree.
899  */
900  BLE_GATT_UNIT_PLANE_ANGLE_DEGREE = 0x2763,
901 
902  /**
903  * Plane angle, minute.
904  */
905  BLE_GATT_UNIT_PLANE_ANGLE_MINUTE = 0x2764,
906 
907  /**
908  * Plane angle, seconds.
909  */
910  BLE_GATT_UNIT_PLANE_ANGLE_SECOND = 0x2765,
911 
912  /**
913  * Area, hectare.
914  */
915  BLE_GATT_UNIT_AREA_HECTARE = 0x2766,
916 
917  /**
918  * Volume, liter.
919  */
920  BLE_GATT_UNIT_VOLUME_LITRE = 0x2767,
921 
922  /**
923  * Mass, ton.
924  */
925  BLE_GATT_UNIT_MASS_TONNE = 0x2768,
926 
927  /**
928  * Pressure, bar.
929  */
930  BLE_GATT_UNIT_PRESSURE_BAR = 0x2780,
931 
932  /**
933  * Pressure, millimeter of mercury.
934  */
935  BLE_GATT_UNIT_PRESSURE_MILLIMETRE_OF_MERCURY = 0x2781,
936 
937  /**
938  * Length, ngstrm.
939  */
940  BLE_GATT_UNIT_LENGTH_ANGSTROM = 0x2782,
941 
942  /**
943  * Length, nautical mile.
944  */
945  BLE_GATT_UNIT_LENGTH_NAUTICAL_MILE = 0x2783,
946 
947  /**
948  * Area, barn.
949  */
950  BLE_GATT_UNIT_AREA_BARN = 0x2784,
951 
952  /**
953  * Velocity, knot.
954  */
955  BLE_GATT_UNIT_VELOCITY_KNOT = 0x2785,
956 
957  /**
958  * Logarithmic radio quantity, neper.
959  */
960  BLE_GATT_UNIT_LOGARITHMIC_RADIO_QUANTITY_NEPER = 0x2786,
961 
962  /**
963  * Logarithmic radio quantity, bel.
964  */
965  BLE_GATT_UNIT_LOGARITHMIC_RADIO_QUANTITY_BEL = 0x2787,
966 
967  /**
968  * Length, yard.
969  */
970  BLE_GATT_UNIT_LENGTH_YARD = 0x27A0,
971 
972  /**
973  * Length, parsec.
974  */
975  BLE_GATT_UNIT_LENGTH_PARSEC = 0x27A1,
976 
977  /**
978  * Length, inch.
979  */
980  BLE_GATT_UNIT_LENGTH_INCH = 0x27A2,
981 
982  /**
983  * Length, foot.
984  */
985  BLE_GATT_UNIT_LENGTH_FOOT = 0x27A3,
986 
987  /**
988  * Length, mile.
989  */
990  BLE_GATT_UNIT_LENGTH_MILE = 0x27A4,
991 
992  /**
993  * Pressure, pound-force per square inch.
994  */
995  BLE_GATT_UNIT_PRESSURE_POUND_FORCE_PER_SQUARE_INCH = 0x27A5,
996 
997  /**
998  * Velocity, kilometer per hour.
999  */
1000  BLE_GATT_UNIT_VELOCITY_KILOMETRE_PER_HOUR = 0x27A6,
1001 
1002  /** Velocity, mile per hour.
1003  *
1004  */
1005  BLE_GATT_UNIT_VELOCITY_MILE_PER_HOUR = 0x27A7,
1006 
1007  /**
1008  * Angular Velocity, revolution per minute.
1009  */
1010  BLE_GATT_UNIT_ANGULAR_VELOCITY_REVOLUTION_PER_MINUTE = 0x27A8,
1011 
1012  /**
1013  * Energy, gram calorie.
1014  */
1015  BLE_GATT_UNIT_ENERGY_GRAM_CALORIE = 0x27A9,
1016 
1017  /**
1018  * Energy, kilogram calorie.
1019  */
1020  BLE_GATT_UNIT_ENERGY_KILOGRAM_CALORIE = 0x27AA,
1021 
1022  /**
1023  * Energy, killowatt hour.
1024  */
1025  BLE_GATT_UNIT_ENERGY_KILOWATT_HOUR = 0x27AB,
1026 
1027  /**
1028  * Thermodynamic temperature, degree Fahrenheit.
1029  */
1030  BLE_GATT_UNIT_THERMODYNAMIC_TEMPERATURE_DEGREE_FAHRENHEIT = 0x27AC,
1031 
1032  /**
1033  * Percentage.
1034  */
1035  BLE_GATT_UNIT_PERCENTAGE = 0x27AD,
1036 
1037  /**
1038  * Per mille.
1039  */
1040  BLE_GATT_UNIT_PER_MILLE = 0x27AE,
1041 
1042  /**
1043  * Period, beats per minute.
1044  */
1045  BLE_GATT_UNIT_PERIOD_BEATS_PER_MINUTE = 0x27AF,
1046 
1047  /**
1048  * Electric charge, ampere hours.
1049  */
1050  BLE_GATT_UNIT_ELECTRIC_CHARGE_AMPERE_HOURS = 0x27B0,
1051 
1052  /**
1053  * Mass density, milligram per deciliter.
1054  */
1055  BLE_GATT_UNIT_MASS_DENSITY_MILLIGRAM_PER_DECILITRE = 0x27B1,
1056 
1057  /**
1058  * Mass density, millimole per liter.
1059  */
1060  BLE_GATT_UNIT_MASS_DENSITY_MILLIMOLE_PER_LITRE = 0x27B2,
1061 
1062  /**
1063  * Time, year.
1064  */
1065  BLE_GATT_UNIT_TIME_YEAR = 0x27B3,
1066 
1067  /**
1068  * Time, month.
1069  */
1070  BLE_GATT_UNIT_TIME_MONTH = 0x27B4,
1071 
1072  /**
1073  * Concentration, count per cubic meter.
1074  */
1075  BLE_GATT_UNIT_CONCENTRATION_COUNT_PER_CUBIC_METRE = 0x27B5,
1076 
1077  /**
1078  * Irradiance, watt per square meter.
1079  */
1080  BLE_GATT_UNIT_IRRADIANCE_WATT_PER_SQUARE_METRE = 0x27B6
1081  };
1082 
1083  /**
1084  * Presentation format of a characteristic.
1085  *
1086  * It determines how the value of a characteristic is formatted. A server
1087  * can expose that information to its clients by adding a Characteristic
1088  * Presentation Format descriptor to relevant characteristics.
1089  *
1090  * @note See Bluetooth Specification 4.0 (Vol. 3), Part G, Section 3.3.3.5.2.
1091  */
1092  enum {
1093  /**
1094  * Reserved for future use.
1095  */
1096  BLE_GATT_FORMAT_RFU = 0x00,
1097 
1098  /**
1099  * Boolean.
1100  */
1101  BLE_GATT_FORMAT_BOOLEAN = 0x01,
1102 
1103  /**
1104  * Unsigned 2-bit integer.
1105  */
1106  BLE_GATT_FORMAT_2BIT = 0x02,
1107 
1108  /**
1109  * Unsigned 4-bit integer.
1110  */
1111  BLE_GATT_FORMAT_NIBBLE = 0x03,
1112 
1113  /**
1114  * Unsigned 8-bit integer.
1115  */
1116  BLE_GATT_FORMAT_UINT8 = 0x04,
1117 
1118  /**
1119  * Unsigned 12-bit integer.
1120  */
1121  BLE_GATT_FORMAT_UINT12 = 0x05,
1122 
1123  /**
1124  * Unsigned 16-bit integer.
1125  */
1126  BLE_GATT_FORMAT_UINT16 = 0x06,
1127 
1128  /**
1129  * Unsigned 24-bit integer.
1130  */
1131  BLE_GATT_FORMAT_UINT24 = 0x07,
1132 
1133  /**
1134  * Unsigned 32-bit integer.
1135  */
1136  BLE_GATT_FORMAT_UINT32 = 0x08,
1137 
1138  /**
1139  * Unsigned 48-bit integer.
1140  */
1141  BLE_GATT_FORMAT_UINT48 = 0x09,
1142 
1143  /**
1144  * Unsigned 64-bit integer.
1145  */
1146  BLE_GATT_FORMAT_UINT64 = 0x0A,
1147 
1148  /**
1149  * Unsigned 128-bit integer.
1150  */
1151  BLE_GATT_FORMAT_UINT128 = 0x0B,
1152 
1153  /**
1154  * Signed 8-bit integer.
1155  */
1156  BLE_GATT_FORMAT_SINT8 = 0x0C,
1157 
1158  /**
1159  * Signed 12-bit integer.
1160  */
1161  BLE_GATT_FORMAT_SINT12 = 0x0D,
1162 
1163  /**
1164  * Signed 16-bit integer.
1165  */
1166  BLE_GATT_FORMAT_SINT16 = 0x0E,
1167 
1168  /**
1169  * Signed 24-bit integer.
1170  */
1171  BLE_GATT_FORMAT_SINT24 = 0x0F,
1172 
1173  /**
1174  * Signed 32-bit integer.
1175  */
1176  BLE_GATT_FORMAT_SINT32 = 0x10,
1177 
1178  /**
1179  * Signed 48-bit integer.
1180  */
1181  BLE_GATT_FORMAT_SINT48 = 0x11,
1182 
1183  /**
1184  * Signed 64-bit integer.
1185  */
1186  BLE_GATT_FORMAT_SINT64 = 0x12,
1187 
1188  /**
1189  * Signed 128-bit integer.
1190  */
1191  BLE_GATT_FORMAT_SINT128 = 0x13,
1192 
1193  /**
1194  * IEEE-754 32-bit floating point.
1195  */
1196  BLE_GATT_FORMAT_FLOAT32 = 0x14,
1197 
1198  /**
1199  * IEEE-754 64-bit floating point.
1200  */
1201  BLE_GATT_FORMAT_FLOAT64 = 0x15,
1202 
1203  /**
1204  * IEEE-11073 16-bit SFLOAT.
1205  */
1206  BLE_GATT_FORMAT_SFLOAT = 0x16,
1207 
1208  /**
1209  * IEEE-11073 32-bit FLOAT.
1210  */
1211  BLE_GATT_FORMAT_FLOAT = 0x17,
1212 
1213  /**
1214  * IEEE-20601 format.
1215  */
1216  BLE_GATT_FORMAT_DUINT16 = 0x18,
1217 
1218  /**
1219  * UTF8 string.
1220  */
1221  BLE_GATT_FORMAT_UTF8S = 0x19,
1222 
1223  /**
1224  * UTF16 string.
1225  */
1226  BLE_GATT_FORMAT_UTF16S = 0x1A,
1227 
1228  /**
1229  * Opaque Structure.
1230  */
1231  BLE_GATT_FORMAT_STRUCT = 0x1B
1232  };
1233 
1234  /*!
1235  * Characteristic properties.
1236  *
1237  * It is a bitfield that determines how a characteristic value can be used.
1238  *
1239  * @note See Bluetooth Specification 4.0 (Vol. 3), Part G, Section 3.3.1.1
1240  * and Section 3.3.3.1 for Extended Properties.
1241  */
1243  /**
1244  * No property defined.
1245  */
1246  BLE_GATT_CHAR_PROPERTIES_NONE = 0x00,
1247 
1248  /**
1249  * Permits broadcasts of the characteristic value using the Server
1250  * Characteristic Configuration descriptor.
1251  */
1252  BLE_GATT_CHAR_PROPERTIES_BROADCAST = 0x01,
1253 
1254  /**
1255  * Permits reads of the characteristic value.
1256  */
1257  BLE_GATT_CHAR_PROPERTIES_READ = 0x02,
1258 
1259  /**
1260  * Permits writes of the characteristic value without response.
1261  */
1262  BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE = 0x04,
1263 
1264  /**
1265  * Permits writes of the characteristic value with response.
1266  */
1267  BLE_GATT_CHAR_PROPERTIES_WRITE = 0x08,
1268 
1269  /**
1270  * Permits notifications of a characteristic value without acknowledgment.
1271  */
1272  BLE_GATT_CHAR_PROPERTIES_NOTIFY = 0x10,
1273 
1274  /**
1275  * Permits indications of a characteristic value with acknowledgment.
1276  */
1277  BLE_GATT_CHAR_PROPERTIES_INDICATE = 0x20,
1278 
1279  /**
1280  * Permits signed writes to the characteristic value.
1281  */
1282  BLE_GATT_CHAR_PROPERTIES_AUTHENTICATED_SIGNED_WRITES = 0x40,
1283 
1284  /**
1285  * The Characteristic Extended Properties descriptor
1286  * defines additional characteristic properties.
1287  */
1288  BLE_GATT_CHAR_PROPERTIES_EXTENDED_PROPERTIES = 0x80
1289  };
1290 
1291  /**
1292  * Indicates if the properties has at least one of the writable flags.
1293  *
1294  * @param[in] properties The properties to inspect.
1295  *
1296  * @return True if the properties set at least one of the writable flags and
1297  * false otherwise.
1298  */
1299  static bool isWritable(uint8_t properties)
1300  {
1301  const uint8_t writable =
1302  BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE |
1303  BLE_GATT_CHAR_PROPERTIES_WRITE |
1304  BLE_GATT_CHAR_PROPERTIES_AUTHENTICATED_SIGNED_WRITES;
1305 
1306  return properties & writable;
1307  }
1308 
1309  /**
1310  * Indicates if the properties is readable.
1311  *
1312  * @param[in] properties The properties to inspect.
1313  *
1314  * @return True if the properties has its readable flag set and false
1315  * otherwise.
1316  */
1317  static bool isReadable(uint8_t properties)
1318  {
1319  const uint8_t readable = BLE_GATT_CHAR_PROPERTIES_READ;
1320  return properties & readable;
1321  }
1322 
1323  /**
1324  * Value of a Characteristic Presentation Format descriptor.
1325  *
1326  * Characteristic Presentation Format descriptor expresses the format of a
1327  * characteristic value.
1328  *
1329  * @note See Bluetooth Specification 4.0 (Vol. 3), Part G, Section 3.3.3.5.
1330  */
1332  /**
1333  * Format of the value.
1334  */
1335  uint8_t gatt_format;
1336 
1337  /**
1338  * Exponent for integer data types.
1339  *
1340  * Example: if Exponent = -3 and the char value is 3892, the actual
1341  * value is 3.892
1342  */
1343  int8_t exponent;
1344 
1345  /**
1346  * Unit of the characteristic value.
1347  *
1348  * It is a UUID from Bluetooth Assigned Numbers.
1349  */
1350  uint16_t gatt_unit;
1351 
1352  /**
1353  * Namespace of the description field.
1354  *
1355  * This field identifies the organization that is responsible for
1356  * defining the enumerations for the description field.
1357  *
1358  * The namespace of the Bluetooth Body is 0x01.
1359  */
1361 
1362  /**
1363  * Description.
1364  *
1365  * @note The value 0x0000 means unknown in the Bluetooth namespace.
1366  */
1367  uint16_t gatt_nsdesc;
1368 
1369  };
1370 
1371  /**
1372  * Security level applied to GATT operations.
1373  */
1375 
1376  /**
1377  * @brief Constructs a new GattCharacteristic.
1378  *
1379  * @param[in] uuid The UUID of this characteristic.
1380  * @param[in] valuePtr Memory buffer holding the initial value. The value is
1381  * copied into the Bluetooth subsytem when the enclosing service is added.
1382  * Thereafter, the stack maintains it internally.
1383  * @param[in] len The length in bytes of this characteristic's value.
1384  * @param[in] maxLen The capacity in bytes of the characteristic value
1385  * buffer.
1386  * @param[in] props An 8-bit field that contains the characteristic's
1387  * properties.
1388  * @param[in] descriptors A pointer to an array of descriptors to be included
1389  * within this characteristic. The caller owns the memory for the descriptor
1390  * array, which must remain valid at least until the enclosing service is
1391  * added to the GATT table.
1392  * @param[in] numDescriptors The number of descriptors presents in @p
1393  * descriptors array.
1394  * @param[in] hasVariableLen Flag that indicates if the attribute's value
1395  * length can change throughout time.
1396  *
1397  * @note If valuePtr is nullptr, length is equal to 0 and the characteristic
1398  * is readable, then that particular characteristic may be considered
1399  * optional and dropped while instantiating the service with the underlying
1400  * BLE stack.
1401  *
1402  * @note A Client Characteristic Configuration Descriptor (CCCD) should not
1403  * be allocated if either the notify or indicate flag in the @p props bit
1404  * field; the underlying BLE stack handles it.
1405  *
1406  * @attention GattCharacteristic registered in a GattServer must remain
1407  * valid for the lifetime of the GattServer.
1408  */
1410  const UUID &uuid,
1411  uint8_t *valuePtr = nullptr,
1412  uint16_t len = 0,
1413  uint16_t maxLen = 0,
1414  uint8_t props = BLE_GATT_CHAR_PROPERTIES_NONE,
1415  GattAttribute *descriptors[] = nullptr,
1416  unsigned numDescriptors = 0,
1417  bool hasVariableLen = true
1418  ) : _valueAttribute(uuid, valuePtr, len, maxLen, hasVariableLen),
1419  _properties(props),
1420  _descriptors(descriptors),
1421  _descriptorCount(numDescriptors),
1422  readAuthorizationCallback(),
1423  writeAuthorizationCallback(),
1424  _update_security(SecurityRequirement_t::NONE) {
1425  _valueAttribute.allowWrite(isWritable(_properties));
1426  _valueAttribute.allowRead(isReadable(_properties));
1427 
1428 #if BLE_FEATURE_SECURITY
1429  // signed writes requires at least an unauthenticated CSRK or an
1430  // unauthenticated ltk if the link is encrypted.
1431  if (_properties & BLE_GATT_CHAR_PROPERTIES_AUTHENTICATED_SIGNED_WRITES) {
1432  _valueAttribute.setWriteSecurityRequirement(
1433  SecurityRequirement_t::UNAUTHENTICATED
1434  );
1435  }
1436 #endif // BLE_FEATURE_SECURITY
1437  }
1438 
1439  GattCharacteristic(const GattCharacteristic &) = delete;
1440  GattCharacteristic& operator=(const GattCharacteristic &) = delete;
1441 
1442  ~GattCharacteristic() {
1443  delete _implicit_cccd;
1444  _implicit_cccd = nullptr;
1445  }
1446 
1447 public:
1448 
1449  /**
1450  * Set all security requirements of the characteristic.
1451  *
1452  * @param read_security The security requirement of the read operations.
1453  * @param write_security The security requirement of write operations.
1454  * @param update_security The security requirement of update operations.
1455  */
1457  SecurityRequirement_t read_security,
1458  SecurityRequirement_t write_security,
1459  SecurityRequirement_t update_security
1460  ) {
1461  setReadSecurityRequirement(read_security);
1462  setWriteSecurityRequirement(write_security);
1463  setUpdateSecurityRequirement(update_security);
1464  }
1465 
1466  /**
1467  * Set the security of the read operation.
1468  *
1469  * @param[in] security The security requirement of the read operation.
1470  */
1471  void setReadSecurityRequirement(SecurityRequirement_t security)
1472  {
1473  _valueAttribute.setReadSecurityRequirement(security);
1474  }
1475 
1476  /**
1477  * Get the security requirement of the read operation.
1478  *
1479  * @return The security requirement of the read operation.
1480  */
1481  SecurityRequirement_t getReadSecurityRequirement() const
1482  {
1483  return _valueAttribute.getReadSecurityRequirement();
1484  }
1485 
1486  /**
1487  * Set the security requirement of the write operations.
1488  *
1489  * @note If the signed write flag is set in the characteristic properties
1490  * then the security requirement applied to write operation must be either
1491  * AUTHENTICATED or UNAUTHENTICATED. Security requirements NONE and
1492  * SC_AUTHENTICATED are not applicable to signing operation.
1493  *
1494  * @param[in] security The security requirement of write operations.
1495  */
1496  void setWriteSecurityRequirement(SecurityRequirement_t security)
1497  {
1498 #if BLE_FEATURE_SECURITY
1499  MBED_ASSERT(
1500  ((_properties & BLE_GATT_CHAR_PROPERTIES_AUTHENTICATED_SIGNED_WRITES) &&
1501  ((security == SecurityRequirement_t::NONE) ||
1502  (security == SecurityRequirement_t::SC_AUTHENTICATED))) == false
1503  );
1504 #endif // BLE_FEATURE_SECURITY
1505  _valueAttribute.setWriteSecurityRequirement(security);
1506  }
1507 
1508  /**
1509  * Get the security requirement of write operations.
1510  *
1511  * @return The security requirement of write operations.
1512  */
1513  SecurityRequirement_t getWriteSecurityRequirement() const
1514  {
1515  return _valueAttribute.getWriteSecurityRequirement();
1516  }
1517 
1518  /**
1519  * Set the security requirement of update operations.
1520  *
1521  * @note This security requirement is also applied to the write operation of
1522  * the Client Characteristic Configuration Descriptor.
1523  *
1524  * @param[in] security The security requirement that must be met to send
1525  * updates and accept write of the CCCD.
1526  */
1527  void setUpdateSecurityRequirement(SecurityRequirement_t security)
1528  {
1529  _update_security = security.value();
1530  }
1531 
1532  /**
1533  * Get the security requirement of update operations.
1534  *
1535  * @note This security requirement is also applied to the write operation of
1536  * the Client Characteristic Configuration Descriptor.
1537  *
1538  * @return The security requirement that must be met to send updates and
1539  * accept write of the CCCD.
1540  */
1541  SecurityRequirement_t getUpdateSecurityRequirement() const
1542  {
1543  return static_cast<SecurityRequirement_t::type>(_update_security);
1544  }
1545 
1546 public:
1547  /**
1548  * Register a callback handling client's write requests or commands.
1549  *
1550  * The callback registered is invoked when the client attempts to write the
1551  * characteristic value; the event handler can accept or reject the write
1552  * request with the appropriate error code.
1553  *
1554  * @param[in] callback Event handler being registered.
1555  */
1558  ) {
1559  writeAuthorizationCallback.attach(callback);
1560  }
1561 
1562  /**
1563  * Register a callback handling client's write requests or commands.
1564  *
1565  * The callback registered is invoked when the client attempts to write the
1566  * characteristic value; the event handler can accept or reject the write
1567  * request with the appropriate error code.
1568  *
1569  * @param[in] object Pointer to the object of a class defining the event
1570  * handler (@p member). It must remain valid for the lifetime of the
1571  * GattCharacteristic.
1572  * @param[in] member The member function that handles the write event.
1573  */
1574  template <typename T>
1576  T *object,
1577  void (T::*member)(GattWriteAuthCallbackParams *)
1578  ) {
1579  writeAuthorizationCallback.attach(object, member);
1580  }
1581 
1582  /**
1583  * Register the read requests event handler.
1584  *
1585  * The callback registered is invoked when the client attempts to read the
1586  * characteristic value; the event handler can accept or reject the read
1587  * request with the appropriate error code. It can also set specific outgoing
1588  * data.
1589  *
1590  * @param[in] callback Event handler being registered.
1591  */
1594  ) {
1595  readAuthorizationCallback.attach(callback);
1596  }
1597 
1598  /**
1599  * Register the read requests event handler.
1600  *
1601  * The callback registered is invoked when the client attempts to read the
1602  * characteristic value; the event handler can accept or reject the read
1603  * request with the appropriate error code. It can also set specific outgoing
1604  * data.
1605  *
1606  * @param[in] object Pointer to the object of a class defining the event
1607  * handler (@p member). It must remain valid for the lifetime of the
1608  * GattCharacteristic.
1609  * @param[in] member The member function that handles the read event.
1610  */
1611  template <typename T>
1613  T *object,
1614  void (T::*member)(GattReadAuthCallbackParams *)
1615  ) {
1616  readAuthorizationCallback.attach(object, member);
1617  }
1618 
1619  /**
1620  * Invoke the write authorization callback.
1621  *
1622  * This function is a helper that calls the registered write handler to
1623  * determine the authorization reply for a write request.
1624  *
1625  * @attention This function is not meant to be called by user code.
1626  *
1627  * @param[in] params Context of the write-auth request; it contains an
1628  * out-parameter used as a reply.
1629  *
1630  * @return A GattAuthCallbackReply_t value indicating whether authorization
1631  * is granted.
1632  */
1634  {
1635  if (!isWriteAuthorizationEnabled()) {
1637  }
1638 
1639  /* Initialized to no-error by default. */
1641  writeAuthorizationCallback.call(params);
1642  return params->authorizationReply;
1643  }
1644 
1645  /**
1646  * Invoke the read authorization callback.
1647  *
1648  * This function is a helper that calls the registered read handler to
1649  * determine the authorization reply for a read request.
1650  *
1651  * @attention This function is not meant to be called by user code.
1652  *
1653  * @param[in] params Context of the read-auth request; it contains an
1654  * out-parameter used as a reply and the handler can fill it with outgoing
1655  * data.
1656  *
1657  * @return A GattAuthCallbackReply_t value indicating whether authorization
1658  * is granted.
1659  *
1660  * @note If the read request is approved and params->data remains nullptr, then
1661  * the current characteristic value is used in the read response payload.
1662  *
1663  * @note If the read is approved, the event handler can specify an outgoing
1664  * value directly with the help of the fields
1665  * GattReadAuthCallbackParams::data and GattReadAuthCallbackParams::len.
1666  */
1668  {
1669  if (!isReadAuthorizationEnabled()) {
1671  }
1672 
1673  /* Initialized to no-error by default. */
1675  readAuthorizationCallback.call(params);
1676  return params->authorizationReply;
1677  }
1678 
1679 public:
1680  /**
1681  * Get the characteristic's value attribute.
1682  *
1683  * @return A reference to the characteristic's value attribute.
1684  */
1686  {
1687  return _valueAttribute;
1688  }
1689 
1690  /**
1691  * Get the characteristic's value attribute.
1692  *
1693  * @return A const reference to the characteristic's value attribute.
1694  */
1696  {
1697  return _valueAttribute;
1698  }
1699 
1700  /**
1701  * Get the characteristic's value attribute handle in the ATT table.
1702  *
1703  * @return The value attribute handle.
1704  *
1705  * @note The underlying BLE stack assigns the attribute handle when the
1706  * enclosing service is added.
1707  */
1709  {
1710  return getValueAttribute().getHandle();
1711  }
1712 
1713  /**
1714  * Get the characteristic's properties.
1715  *
1716  * @note Refer to GattCharacteristic::Properties_t.
1717  *
1718  * @return The characteristic's properties.
1719  */
1720  uint8_t getProperties() const
1721  {
1722  return _properties;
1723  }
1724 
1725  /**
1726  * Get the total number of descriptors within this characteristic.
1727  *
1728  * @return The total number of descriptors.
1729  */
1730  uint8_t getDescriptorCount() const
1731  {
1732  return (_implicit_cccd == nullptr? _descriptorCount : _descriptorCount+1);
1733  }
1734 
1735  /**
1736  * Check whether read authorization is enabled.
1737  *
1738  * Read authorization is enabled when a read authorization event handler is
1739  * set up.
1740  *
1741  * @return true if read authorization is enabled and false otherwise.
1742  */
1744  {
1745  return readAuthorizationCallback;
1746  }
1747 
1748  /**
1749  * Check whether write authorization is enabled.
1750  *
1751  * Write authorization is enabled when a write authorization event handler is
1752  * set up.
1753  *
1754  * @return true if write authorization is enabled, false otherwise.
1755  */
1757  {
1758  return writeAuthorizationCallback;
1759  }
1760 
1761  /**
1762  * Get this characteristic's descriptor at a specific index.
1763  *
1764  * @param[in] index The index of the descriptor to get.
1765  *
1766  * @return A pointer the requested descriptor if @p index is within the
1767  * range of the descriptor array or nullptr otherwise.
1768  *
1769  * @note if this characteristic has an implicitly-created CCCD this
1770  * descriptor will be available at the highest index
1771  * (ie: return of getDescriptorCount() - 1)
1772  */
1774  {
1775 
1776  if(index == _descriptorCount) {
1777  // If _implicit_cccd is nullptr, we want to return that anyway
1778  return _implicit_cccd;
1779  }
1780  else if (index > _descriptorCount) {
1781  return nullptr;
1782  }
1783 
1784  return _descriptors[index];
1785  }
1786 
1787 
1788 private:
1789 
1790  friend ble::impl::GattServer;
1791 
1792 #if !defined(DOXYGEN_ONLY)
1793  /**
1794  * Sets this GattCharacteristic's implicitly-created CCCD, if
1795  * applicable.
1796  *
1797  * @note once this is called, the pointed-to GattAttribute
1798  * is owned by this GattCharacteristic and will be deleted
1799  * during this object's destructor
1800  */
1801  void setImplicitCCCD(GattAttribute *implicit_cccd) {
1802  _implicit_cccd = implicit_cccd;
1803  }
1804 #endif // !defined(DOXYGEN_ONLY)
1805 
1806 
1807 private:
1808 
1809  /**
1810  * Attribute that contains the actual value of this characteristic.
1811  */
1812  GattAttribute _valueAttribute;
1813 
1814  /**
1815  * The characteristic's properties. Refer to
1816  * GattCharacteristic::Properties_t.
1817  */
1818  uint8_t _properties;
1819 
1820  /**
1821  * The characteristic's descriptor attributes.
1822  */
1823  GattAttribute **_descriptors;
1824 
1825  /**
1826  * The number of descriptors in this characteristic.
1827  */
1828  uint8_t _descriptorCount;
1829 
1830  /**
1831  * Pointer to characteristic's implicit CCCD, if applicable
1832  *
1833  * @note this is only populated if the stack creates an implicit CCCD
1834  * for this GattCharacteristic. If the descriptors array passed into
1835  * the constructor includes a CCCD this field is left as nullptr to
1836  * indicate the CCCD was explicitly created.
1837  */
1838  GattAttribute* _implicit_cccd = nullptr;
1839 
1840  /**
1841  * The registered callback handler for read authorization reply.
1842  */
1844  readAuthorizationCallback;
1845 
1846  /**
1847  * The registered callback handler for write authorization reply.
1848  */
1850  writeAuthorizationCallback;
1851 
1852  /**
1853  * Security requirements of update operations.
1854  *
1855  * The peer must meet the security requirement to enable, disable and
1856  * receive updates
1857  */
1858  uint8_t _update_security: SecurityRequirement_t::size;
1859 };
1860 
1861 /**
1862  * Helper class that represents a read only GattCharacteristic.
1863  */
1864 template <typename T>
1866 public:
1867  /**
1868  * Construct a ReadOnlyGattCharacteristic.
1869  *
1870  * @param[in] uuid The characteristic's UUID.
1871  * @param[in] valuePtr Pointer to the characteristic's initial value. The
1872  * pointer is reinterpreted as a pointer to an uint8_t buffer.
1873  * @param[in] additionalProperties Additional characteristic properties. By
1874  * default, the properties are set to
1875  * Properties_t::BLE_GATT_CHAR_PROPERTIES_READ.
1876  * @param[in] descriptors An array of pointers to descriptors to be added
1877  * to the new characteristic.
1878  * @param[in] numDescriptors The total number of descriptors in @p
1879  * descriptors.
1880  *
1881  * @note Instances of ReadOnlyGattCharacteristic have a fixed length
1882  * attribute value that equals sizeof(T). For a variable length alternative,
1883  * use GattCharacteristic directly.
1884  */
1886  const UUID &uuid,
1887  T *valuePtr,
1888  uint8_t additionalProperties = BLE_GATT_CHAR_PROPERTIES_NONE,
1889  GattAttribute *descriptors[] = nullptr,
1890  unsigned numDescriptors = 0
1891  ) : GattCharacteristic(
1892  uuid,
1893  reinterpret_cast<uint8_t *>(valuePtr),
1894  sizeof(T),
1895  sizeof(T),
1896  BLE_GATT_CHAR_PROPERTIES_READ | additionalProperties,
1897  descriptors,
1898  numDescriptors,
1899  false
1900  ) {
1901  }
1902 };
1903 
1904 /**
1905  * Helper class that represents a write only GattCharacteristic.
1906  */
1907 template <typename T>
1909 public:
1910  /**
1911  * Construct a WriteOnlyGattCharacteristic.
1912  *
1913  * @param[in] uuid The characteristic's UUID.
1914  * @param[in] valuePtr Pointer to the characteristic's initial value. The
1915  * pointer is reinterpreted as a pointer to an uint8_t buffer.
1916  * @param[in] additionalProperties Additional characteristic properties. By
1917  * default, the properties are set to
1918  * Properties_t::BLE_GATT_CHAR_PROPERTIES_WRITE.
1919  * @param[in] descriptors An array of pointers to descriptors to be added to
1920  * the new characteristic.
1921  * @param[in] numDescriptors The total number of descriptors in @p
1922  * descriptors.
1923  *
1924  * @note Instances of WriteOnlyGattCharacteristic have variable length
1925  * attribute value with maximum size equal to sizeof(T). For a fixed length
1926  * alternative, use GattCharacteristic directly.
1927  */
1929  const UUID &uuid,
1930  T *valuePtr,
1931  uint8_t additionalProperties = BLE_GATT_CHAR_PROPERTIES_NONE,
1932  GattAttribute *descriptors[] = nullptr,
1933  unsigned numDescriptors = 0
1934  ) : GattCharacteristic(
1935  uuid,
1936  reinterpret_cast<uint8_t *>(valuePtr),
1937  sizeof(T),
1938  sizeof(T),
1939  BLE_GATT_CHAR_PROPERTIES_WRITE | additionalProperties,
1940  descriptors,
1941  numDescriptors
1942  ) {
1943  }
1944 };
1945 
1946 /**
1947  * Helper class that represents a readable and writable GattCharacteristic.
1948  */
1949 template <typename T>
1951 public:
1952  /**
1953  * Construct a ReadWriteGattCharacteristic.
1954  *
1955  * @param[in] uuid The characteristic's UUID.
1956  * @param[in] valuePtr Pointer to the characteristic's initial value. The
1957  * pointer is reinterpreted as a pointer to an uint8_t buffer.
1958  * @param[in] additionalProperties Additional characteristic properties. By
1959  * default, the properties are set to
1960  * Properties_t::BLE_GATT_CHAR_PROPERTIES_WRITE and
1961  * Properties_t::BLE_GATT_CHAR_PROPERTIES_READ.
1962  * @param[in] descriptors An array of pointers to descriptors to be added to
1963  * the new characteristic.
1964  * @param[in] numDescriptors The total number of descriptors in @p descriptors.
1965  *
1966  * @note Instances of ReadWriteGattCharacteristic have variable length
1967  * attribute value with maximum size equal to sizeof(T). For a fixed length
1968  * alternative, use GattCharacteristic directly.
1969  */
1971  const UUID &uuid,
1972  T *valuePtr,
1973  uint8_t additionalProperties = BLE_GATT_CHAR_PROPERTIES_NONE,
1974  GattAttribute *descriptors[] = nullptr,
1975  unsigned numDescriptors = 0
1976  ) : GattCharacteristic(
1977  uuid,
1978  reinterpret_cast<uint8_t *>(valuePtr),
1979  sizeof(T),
1980  sizeof(T),
1981  BLE_GATT_CHAR_PROPERTIES_READ | BLE_GATT_CHAR_PROPERTIES_WRITE | additionalProperties,
1982  descriptors,
1983  numDescriptors
1984  ) {
1985  }
1986 };
1987 
1988 /**
1989  * Helper class that represents a write-only GattCharacteristic with an array
1990  * value.
1991  */
1992 template <typename T, unsigned NUM_ELEMENTS>
1994 public:
1995  /**
1996  * Construct a WriteOnlyGattCharacteristic.
1997  *
1998  * @param[in] uuid The characteristic's UUID.
1999  * @param[in] valuePtr Pointer to an array of length NUM_ELEMENTS containing
2000  * the characteristic's initial value. The pointer is reinterpreted as a
2001  * pointer to an uint8_t buffer.
2002  * @param[in] additionalProperties Additional characteristic properties. By
2003  * default, the properties are set to
2004  * Properties_t::BLE_GATT_CHAR_PROPERTIES_WRITE.
2005  * @param[in] descriptors An array of pointers to descriptors to be added to
2006  * the new characteristic.
2007  * @param[in] numDescriptors The total number of descriptors in @p descriptors.
2008  *
2009  * @note Instances of WriteOnlyGattCharacteristic have variable length
2010  * attribute value with maximum size equal to sizeof(T) * NUM_ELEMENTS.
2011  * For a fixed length alternative, use GattCharacteristic directly.
2012  */
2014  const UUID &uuid,
2015  T valuePtr[NUM_ELEMENTS],
2016  uint8_t additionalProperties = BLE_GATT_CHAR_PROPERTIES_NONE,
2017  GattAttribute *descriptors[] = nullptr,
2018  unsigned numDescriptors = 0
2019  ) : GattCharacteristic(
2020  uuid,
2021  reinterpret_cast<uint8_t *>(valuePtr),
2022  sizeof(T) * NUM_ELEMENTS,
2023  sizeof(T) * NUM_ELEMENTS,
2024  BLE_GATT_CHAR_PROPERTIES_WRITE | additionalProperties,
2025  descriptors,
2026  numDescriptors
2027  ) {
2028  }
2029 };
2030 
2031 /**
2032  * Helper class that represents a read-only GattCharacteristic with an array
2033  * value.
2034  */
2035 template <typename T, unsigned NUM_ELEMENTS>
2037 public:
2038  /**
2039  * Construct a ReadOnlyGattCharacteristic.
2040  *
2041  * @param[in] uuid The characteristic's UUID.
2042  * @param[in] valuePtr Pointer to an array of length NUM_ELEMENTS containing
2043  * the characteristic's initial value. The pointer is reinterpreted as a
2044  * pointer to an uint8_t buffer.
2045  * @param[in] additionalProperties Additional characteristic properties. By
2046  * default, the properties are set to
2047  * Properties_t::BLE_GATT_CHAR_PROPERTIES_READ.
2048  * @param[in] descriptors An array of pointers to descriptors to be added to
2049  * the new characteristic.
2050  * @param[in] numDescriptors The total number of descriptors in @p
2051  * descriptors.
2052  *
2053  * @note Instances of ReadOnlyGattCharacteristic have fixed length
2054  * attribute value that equals sizeof(T) * NUM_ELEMENTS. For a variable
2055  * length alternative, use GattCharacteristic directly.
2056  */
2058  const UUID &uuid,
2059  T valuePtr[NUM_ELEMENTS],
2060  uint8_t additionalProperties = BLE_GATT_CHAR_PROPERTIES_NONE,
2061  GattAttribute *descriptors[] = nullptr,
2062  unsigned numDescriptors = 0
2063  ) : GattCharacteristic(
2064  uuid,
2065  reinterpret_cast<uint8_t *>(valuePtr),
2066  sizeof(T) * NUM_ELEMENTS,
2067  sizeof(T) * NUM_ELEMENTS,
2068  BLE_GATT_CHAR_PROPERTIES_READ | additionalProperties,
2069  descriptors,
2070  numDescriptors,
2071  false
2072  ) {
2073  }
2074 };
2075 
2076 /**
2077  * Helper class that represents a readable and writable GattCharacteristic with
2078  * an array value.
2079  */
2080 template <typename T, unsigned NUM_ELEMENTS>
2082 public:
2083  /**
2084  * Construct a ReadWriteGattCharacteristic.
2085  *
2086  * @param[in] uuid The characteristic's UUID.
2087  * @param[in] valuePtr Pointer to an array of length NUM_ELEMENTS containing
2088  * the characteristic's initial value. The pointer is reinterpreted as a
2089  * pointer to an uint8_t buffer.
2090  * @param[in] additionalProperties Additional characteristic properties. By
2091  * default, the properties are set to
2092  * Properties_t::BLE_GATT_CHAR_PROPERTIES_WRITE |
2093  * Properties_t::BLE_GATT_CHAR_PROPERTIES_READ.
2094  * @param[in] descriptors An array of pointers to descriptors to be added to
2095  * the new characteristic.
2096  * @param[in] numDescriptors The total number of descriptors in @p descriptors.
2097  *
2098  * @note Instances of ReadWriteGattCharacteristic have variable length
2099  * attribute value with maximum size equal to sizeof(T) * NUM_ELEMENTS.
2100  * For a fixed length alternative, use GattCharacteristic directly.
2101  */
2103  const UUID &uuid,
2104  T valuePtr[NUM_ELEMENTS],
2105  uint8_t additionalProperties = BLE_GATT_CHAR_PROPERTIES_NONE,
2106  GattAttribute *descriptors[] = nullptr,
2107  unsigned numDescriptors = 0
2108  ) : GattCharacteristic(
2109  uuid,
2110  reinterpret_cast<uint8_t *>(valuePtr),
2111  sizeof(T) * NUM_ELEMENTS,
2112  sizeof(T) * NUM_ELEMENTS,
2113  BLE_GATT_CHAR_PROPERTIES_READ | BLE_GATT_CHAR_PROPERTIES_WRITE | additionalProperties,
2114  descriptors,
2115  numDescriptors
2116  ) {
2117  }
2118 };
2119 
2120 /**
2121  * @}
2122  * @}
2123  * @}
2124  */
2125 
2126 #endif /* ifndef __GATT_CHARACTERISTIC_H__ */
Helper class that represents a readable and writable GattCharacteristic.
uint8_t getProperties() const
Get the characteristic&#39;s properties.
GattAuthCallbackReply_t authorizationReply
Authorization result.
static bool isWritable(uint8_t properties)
Indicates if the properties has at least one of the writable flags.
uint8_t gatt_namespace
Namespace of the description field.
GattAuthCallbackReply_t authorizeRead(GattReadAuthCallbackParams *params)
Invoke the read authorization callback.
GATT write authorization request event.
GattAttribute::Handle_t getValueHandle() const
Get the characteristic&#39;s value attribute handle in the ATT table.
SecurityRequirement_t getReadSecurityRequirement() const
Get the security requirement of the read operation.
void setUpdateSecurityRequirement(SecurityRequirement_t security)
Set the security requirement of update operations.
Security requirement that can be attached to an attribute operation.
void setSecurityRequirements(SecurityRequirement_t read_security, SecurityRequirement_t write_security, SecurityRequirement_t update_security)
Set all security requirements of the characteristic.
Helper class that represents a readable and writable GattCharacteristic with an array value...
ble::att_security_requirement_t SecurityRequirement_t
Security level applied to GATT operations.
GATT read authorization request event.
GattAttribute & getValueAttribute()
Get the characteristic&#39;s value attribute.
GattAuthCallbackReply_t authorizationReply
Authorization result.
LayoutType value() const
Explicit access to the inner value of the SafeEnum instance.
const GattAttribute & getValueAttribute() const
Get the characteristic&#39;s value attribute.
Callback< R(ArgTs...)> callback(R(*func)(ArgTs...)=nullptr) noexcept
Create a callback class with type inferred from the arguments.
Definition: Callback.h:678
type
struct scoped enum wrapped by the class
Helper class that represents a read-only GattCharacteristic with an array value.
Representation of a Universally Unique Identifier (UUID).
Definition: common/UUID.h:76
void setReadSecurityRequirement(SecurityRequirement_t security)
Set the security of the read operation.
Representation of a GattServer attribute.
ble::attribute_handle_t Handle_t
Representation of an attribute handle.
Helper class that represents a write-only GattCharacteristic with an array value. ...
int8_t exponent
Exponent for integer data types.
uint8_t getDescriptorCount() const
Get the total number of descriptors within this characteristic.
void setReadAuthorizationCallback(void(*callback)(GattReadAuthCallbackParams *))
Register the read requests event handler.
bool isReadAuthorizationEnabled() const
Check whether read authorization is enabled.
GattAuthCallbackReply_t authorizeWrite(GattWriteAuthCallbackParams *params)
Invoke the write authorization callback.
#define MBED_ASSERT(expr)
MBED_ASSERT Declare runtime assertions: results in runtime error if condition is false.
Definition: mbed_assert.h:66
static bool isReadable(uint8_t properties)
Indicates if the properties is readable.
SecurityRequirement_t getWriteSecurityRequirement() const
Get the security requirement of write operations.
Representation of a GattServer characteristic.
GattAttribute * getDescriptor(uint8_t index)
Get this characteristic&#39;s descriptor at a specific index.
Helper class that represents a write only GattCharacteristic.
uint16_t gatt_unit
Unit of the characteristic value.
bool isWriteAuthorizationEnabled() const
Check whether write authorization is enabled.
SecurityRequirement_t getUpdateSecurityRequirement() const
Get the security requirement of update operations.
void setReadAuthorizationCallback(T *object, void(T::*member)(GattReadAuthCallbackParams *))
Register the read requests event handler.
void setWriteAuthorizationCallback(void(*callback)(GattWriteAuthCallbackParams *))
Register a callback handling client&#39;s write requests or commands.
void setWriteSecurityRequirement(SecurityRequirement_t security)
Set the security requirement of the write operations.
GattCharacteristic(const UUID &uuid, uint8_t *valuePtr=nullptr, uint16_t len=0, uint16_t maxLen=0, uint8_t props=BLE_GATT_CHAR_PROPERTIES_NONE, GattAttribute *descriptors[]=nullptr, unsigned numDescriptors=0, bool hasVariableLen=true)
Constructs a new GattCharacteristic.
void setWriteAuthorizationCallback(T *object, void(T::*member)(GattWriteAuthCallbackParams *))
Register a callback handling client&#39;s write requests or commands.
Helper class that represents a read only GattCharacteristic.
Value of a Characteristic Presentation Format descriptor.
Entry namespace for all BLE API definitions.
GattAuthCallbackReply_t
Enumeration of allowed values returned by read or write authorization process.
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