This application shows how to use GAP to transmit a simple value to disconnected peer listening for advertisement every time that a value is updated. The canonical source for this example lives at: https://github.com/ARMmbed/mbed-os-example-ble/tree/master/BLE_GAPButton

Button count over GAP

This application shows how to use GAP to transmit a simple value to disconnected peer listening for advertisement every time that a value is updated:

  • The value is a count of how many times a button on the device was pressed (the code actually monitors the button's releases, not press downs).
  • We transmit the value in the SERVICE_DATA field of the advertising payload.

Running the application

Requirements

The sample application can be seen on any BLE scanner on a smartphone. If you don't have a scanner on your phone, please install :

- nRF Master Control Panel for Android.

- LightBlue for iPhone.

Hardware requirements are in the main readme.

Building instructions

Building with mbed CLI

If you'd like to use mbed CLI to build this, then you should refer to the main readme. The instructions here relate to using the developer.mbed.org Online Compiler

In order to build this example in the mbed Online Compiler, first import the example using the ‘Import’ button on the right hand side.

Next, select a platform to build for. This must either be a platform that supports BLE, for example the NRF51-DK, or one of the following:

List of platforms supporting Bluetooth Low Energy

Or you must also add a piece of hardware and the supporting library that includes a Bluetooth Low Energy driver for that hardware, for example the K64F or NUCLEO_F401RE with the X-NUCLEO-IDB05A1

List of components supporting Bluetooth Low Energy.

Once you have selected your platform, compile the example and drag and drop the resulting binary onto your board.

For general instructions on using the mbed Online Compiler, please see the mbed Handbook

Checking for success

Note: Screens captures depicted below show what is expected from this example if the scanner used is nRF Master Control Panel version 4.0.5. If you encounter any difficulties consider trying another scanner or another version of nRF Master Control Panel. Alternative scanners may require reference to their manuals.

  • Build the application and install it on your board as explained in the building instructions.
  • Open the BLE scanner on your phone.
  • Start a scan.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-GAPButton/raw-file/8f898b781de2/img/start_scan.png

figure 1 How to start scan using nRF Master Control Panel 4.0.5.

  • Find your device; it should be named `GAPButton`; and look at the advertisement broadcasted by your device (there is no need to connect to your device).

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-GAPButton/raw-file/8f898b781de2/img/discovery.png

figure 2 Scan results using nRF Master Control Panel 4.0.5.

  • The Service Data field of the advertisement packet broadcasted by your device reflects the button press count. The starting value is 0.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-GAPButton/raw-file/8f898b781de2/img/initial_state.png

figure 3 Initial state of the button using nRF Master Control Panel 4.0.5.

  • Press the button on the device.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-GAPButton/raw-file/8f898b781de2/img/first_press.png

figure 3 State after 1 button press using nRF Master Control Panel 4.0.5.

  • The Service Data field value of the advertisement packet should change every time you press the button.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-GAPButton/raw-file/8f898b781de2/img/result.png

figure 3 State after 6 button press using nRF Master Control Panel 4.0.5.

Note

Since broadcasting is not reliable and your phone may scan intermittently, it is possible that your phone will miss button updates.

Revisions of mbed-os.lib

Revision Date Message Actions
75:755edfe92edb 2018-11-07 Merge pull request #189 from ARMmbed/donatieng-patch-1 File  Diff  Annotate
74:5f07c82211e5 2018-10-22 Merge pull request #187 from cmonr/master File  Diff  Annotate
73:4a446673b384 2018-09-26 Merge pull request #183 from ARMmbed/mbed-os-5.10.0-oob File  Diff  Annotate
71:038bc22898fb 2018-08-29 Merge pull request #172 from 0xc0170/master File  Diff  Annotate
70:579a3e2ca9b5 2018-08-23 Updating mbed-os to mbed-os-5.9.5 File  Diff  Annotate
69:235cef9b8d60 2018-08-08 Merge pull request #168 from cmonr/master File  Diff  Annotate
68:1f4296f23d88 2018-07-18 Merge pull request #166 from cmonr/master File  Diff  Annotate
67:464f5b492e35 2018-07-06 Merge pull request #163 from adbridge/master File  Diff  Annotate
66:be98e38e598c 2018-06-22 Merge pull request #160 from adbridge/master File  Diff  Annotate
65:d927cb89f35b 2018-06-20 Merge pull request #159 from ARMmbed/mbed-os-5.9.0-oob File  Diff  Annotate
64:7848e0088f94 2018-06-11 Merge pull request #158 from adbridge/master File  Diff  Annotate
63:0dd6262093d9 2018-06-05 Merge pull request #151 from paul-szczepanek-arm/privacy File  Diff  Annotate
62:fd993361c886 2018-04-04 Merge pull request #141 from adbridge/master File  Diff  Annotate
61:1ffd455d931d 2018-04-04 Merge pull request #142 from ARMmbed/mbed-os-5.8.0-oob File  Diff  Annotate
60:001107e7c90b 2018-03-23 Merge pull request #139 from cmonr/master File  Diff  Annotate
59:136540807fac 2018-03-23 Merge pull request #137 from adbridge/master File  Diff  Annotate
58:54ef49a5c9cf 2018-02-13 Merge pull request #135 from adbridge/master File  Diff  Annotate
56:5dc8297b04e9 2018-01-31 Merge pull request #134 from cmonr/master File  Diff  Annotate
55:874d6f0aa3ef 2018-01-17 Merge pull request #133 from adbridge/master File  Diff  Annotate
54:7be26b7eade9 2018-01-09 Merge pull request #129 from adbridge/master File  Diff  Annotate
52:d168cec728b7 2017-12-20 Merge pull request #126 from ARMmbed/mbed-os-5.7.0-oob File  Diff  Annotate
51:b2bb5563f994 2017-12-05 Merge pull request #119 from adbridge/master File  Diff  Annotate
50:67f029b725a4 2017-11-23 Merge pull request #115 from adbridge/master File  Diff  Annotate
49:d5f97ad1a359 2017-11-07 Merge pull request #113 from adbridge/master File  Diff  Annotate
48:91d4934948e2 2017-11-03 Merge pull request #110 from 0xc0170/master File  Diff  Annotate
46:9b386b659844 2017-10-11 Merge pull request #108 from adbridge/master File  Diff  Annotate
45:d42c148d41f2 2017-09-29 Merge pull request #106 from 0xc0170/master File  Diff  Annotate
44:55f5da77e102 2017-09-20 Merge pull request #103 from ARMmbed/5.6_sanity File  Diff  Annotate
43:63b7eadfbcad 2017-09-08 Merge pull request #102 from adbridge/master File  Diff  Annotate
42:3fe3ce7dd726 2017-08-08 Merge pull request #100 from 0xc0170/master File  Diff  Annotate
40:0f3fe53a08cc 2017-07-19 Merge pull request #97 from 0xc0170/master File  Diff  Annotate
38:96780edf66c3 2017-07-11 Merge pull request #93 from adbridge/master File  Diff  Annotate
37:cc38b28a3446 2017-06-22 Merge pull request #89 from adbridge/master File  Diff  Annotate
35:dad435ee6e57 2017-06-20 Merge pull request #88 from adbridge/master File  Diff  Annotate
33:ef9272cc1f82 2017-06-08 Merge pull request #82 from adbridge/master File  Diff  Annotate
32:020d8a8b4675 2017-05-25 Merge pull request #81 from adbridge/master File  Diff  Annotate
31:603c9a634e46 2017-05-10 Merge pull request #79 from adbridge/master File  Diff  Annotate
29:35ac362b9fd0 2017-05-09 Merge pull request #77 from 0xc0170/master File  Diff  Annotate
28:dbf974af4a3e 2017-04-05 Merge pull request #70 from 0xc0170/master File  Diff  Annotate
25:7efe4b43e08e 2017-03-14 Merge pull request #68 from adbridge/master File  Diff  Annotate
24:4de7c8dcf440 2017-03-09 Merge pull request #66 from ARMmbed/oob_test_mbed-os-5.4 File  Diff  Annotate
23:0e3bbca798a6 2017-03-01 Merge pull request #55 from adbridge/master File  Diff  Annotate
21:4006639f72f8 2017-02-15 Merge pull request #52 from 0xc0170/master File  Diff  Annotate
20:38154eb4f35b 2017-02-02 Merge pull request #48 from adbridge/master File  Diff  Annotate
19:7151bddc77a7 2017-01-26 Merge pull request #46 from adbridge/master File  Diff  Annotate
18:218dbaa5e67d 2016-12-15 Update mbed-os revision to mbed-os 5.3.0. File  Diff  Annotate
17:eb0b5fd852c6 2016-12-15 Merge pull request #42 from ARMmbed/mbed-os-5.3.0-rc3 File  Diff  Annotate
16:3ff007600aba 2016-10-28 Updating mbed-os to mbed-os-5.2.1 File  Diff  Annotate
15:da714c2c75cb 2016-10-24 Updating mbed-os to mbed-os-5.2.0 File  Diff  Annotate
14:332bb3fa072b 2016-10-24 Merge pull request #32 from ARMmbed/oob File  Diff  Annotate
13:0495768a0b73 2016-10-05 Updating mbed-os to mbed-os-5.1.5 File  Diff  Annotate
12:c230aa0a635e 2016-09-16 Updating mbed-os to mbed-os-5.1.4 File  Diff  Annotate
11:0feb280abb34 2016-08-20 Updating mbed-os to mbed-os-5.1.2 File  Diff  Annotate
10:4a6c8eee8926 2016-08-19 Updating mbed-os to mbed-os-5.1.1 File  Diff  Annotate
9:13eb922c959d 2016-08-05 Updating mbed-os to mbed-os-5.1.0 File  Diff  Annotate
5:6a2812a8df01 2016-08-03 Updating mbed-os to mbed-os-5.1.0-rc5 File  Diff  Annotate
4:368da4cfc6ba 2016-07-30 Updating mbed-os to mbed-os-5.1.0-rc4 File  Diff  Annotate
3:f0ed4199b362 2016-07-28 Merge branch 'master' of https://github.com/ARMmbed/mbed-os-example-ble File  Diff  Annotate
2:e532bbe3fd8e 2016-07-28 Sync with mbed-os-5.1.0-rc3 File  Diff  Annotate
1:7f4e41bacb3c 2016-07-28 Merge branch 'master' of https://github.com/ARMmbed/mbed-os-example-ble File  Diff  Annotate