Diff: ble/services/EddystoneService.h

Revision:

1053:ec4a5b9b254e

Parent:

978:7d8155c636b8

Child:

992:ca834f7ae8ed

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ble/services/EddystoneService.h	Mon Jan 11 08:51:32 2016 +0000
@@ -0,0 +1,653 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SERVICES_EDDYSTONEBEACON_H_
+#define SERVICES_EDDYSTONEBEACON_H_
+
+#warning ble/services/EddystoneService.h is deprecated. Please use the example in 'github.com/ARMmbed/ble-examples/tree/master/BLE_EddystoneService'.
+
+#include "ble/BLE.h"
+#include "mbed.h"
+#include "CircularBuffer.h"
+static const uint8_t BEACON_EDDYSTONE[] = {0xAA, 0xFE};
+
+//Debug is disabled by default
+#if 0
+#define DBG(MSG, ...)  printf("[EddyStone: DBG]" MSG " \t[%s,%d]\r\n", \
+                            ## __VA_ARGS__,                            \
+                            __FILE__,                                  \
+                            __LINE__);
+#define WARN(MSG, ...) printf("[EddyStone: WARN]" MSG " \t[%s,%d]\r\n", \
+                            ## __VA_ARGS__,                             \
+                            __FILE__,                                   \
+                            __LINE__);
+#define ERR(MSG, ...)  printf("[EddyStone: ERR]" MSG " \t[%s,%d]\r\n", \
+                            ## __VA_ARGS__,                            \
+                            __FILE__,                                  \
+                            __LINE__);
+#else // if 0
+#define DBG(x, ...) //wait_us(10);
+#define WARN(x, ...) //wait_us(10);
+#define ERR(x, ...)
+#endif // if 0
+
+#if 0
+#define INFO(x, ...)  printf("[EddyStone: INFO]"x " \t[%s,%d]\r\n", \
+                             ## __VA_ARGS__,                        \
+                             __FILE__,                              \
+                             __LINE__);
+#else // if 0
+#define INFO(x, ...)
+#endif // if 0
+
+/**
+* @class Eddystone
+* @brief Eddystone Configuration Service. Can be used to set URL, adjust power levels, and set flags.
+* See https://github.com/google/eddystone
+*
+*/
+class EddystoneService
+{
+public:
+    enum FrameTypes {
+        NONE,
+        url,
+        uid,
+        tlm
+    };
+
+    static const int SERVICE_DATA_MAX = 31;             // Maximum size of service data in ADV packets
+
+    // There are currently 3 subframes defined, URI, UID, and TLM
+#define EDDYSTONE_MAX_FRAMETYPE 3
+    void (*frames[EDDYSTONE_MAX_FRAMETYPE])(uint8_t *, uint32_t);
+    static const int URI_DATA_MAX = 18;
+    typedef uint8_t  UriData_t[URI_DATA_MAX];
+    CircularBuffer<FrameTypes, EDDYSTONE_MAX_FRAMETYPE> overflow;
+
+    // UID Frame Type subfields
+    static const int UID_NAMESPACEID_SIZE = 10;
+    typedef uint8_t  UIDNamespaceID_t[UID_NAMESPACEID_SIZE];
+    static const int UID_INSTANCEID_SIZE = 6;
+    typedef uint8_t  UIDInstanceID_t[UID_INSTANCEID_SIZE];
+
+    // Eddystone Frame Type ID
+    static const uint8_t FRAME_TYPE_UID = 0x00;
+    static const uint8_t FRAME_TYPE_URL = 0x10;
+    static const uint8_t FRAME_TYPE_TLM = 0x20;
+
+    static const uint8_t FRAME_SIZE_TLM = 14; // TLM frame is a constant 14Bytes
+    static const uint8_t FRAME_SIZE_UID = 20; // includes RFU bytes
+
+    /**
+     *  Set Eddystone UID Frame information.
+     *
+     *  @param[in] power       TX Power in dB measured at 0 meters from the device. Range of -100 to +20 dB.
+     *  @param[in] namespaceID 10B namespace ID
+     *  @param[in] instanceID  6B instance ID
+     *  @param[in] RFU         2B of RFU, initialized to 0x0000 and not broadcast, included for future reference.
+     */
+    void setUIDFrameData(int8_t           power,
+                         UIDNamespaceID_t namespaceID,
+                         UIDInstanceID_t  instanceID,
+                         float            uidAdvPeriodIn,
+                         uint16_t         RFU = 0x0000) {
+        if (0.0f == uidAdvPeriodIn) {
+            uidIsSet = false;
+            return;
+        }
+        if (power > 20) {
+            power = 20;
+        }
+        if (power < -100) {
+            power = -100;
+        }
+
+        defaultUidPower = power;
+        memcpy(defaultUidNamespaceID, namespaceID, UID_NAMESPACEID_SIZE);
+        memcpy(defaultUidInstanceID,  instanceID,  UID_INSTANCEID_SIZE);
+        uidRFU       = (uint16_t)RFU; // this is probably bad form, but it doesn't really matter yet.
+        uidAdvPeriod = uidAdvPeriodIn;
+        uidIsSet     = true;          // set toggle to advertise UID frames
+    }
+
+    /*
+    *  Construct UID frame from private variables
+    *  @param[in/out] Data pointer to array to store constructed frame in
+    *  @param[in] maxSize number of bytes left in array, effectively how much empty space is available to write to
+    *  @return number of bytes used. negative number indicates error message.
+    */
+    unsigned constructUIDFrame(uint8_t *Data, uint8_t maxSize) {
+        unsigned index = 0;
+
+        Data[index++] = FRAME_TYPE_UID;                     // 1B  Type
+
+        if (defaultUidPower > 20) {
+            defaultUidPower = 20;                           // enforce range of vaild values.
+        }
+        if (defaultUidPower < -100) {
+            defaultUidPower = -100;
+        }
+        Data[index++] = defaultUidPower;                    // 1B  Power @ 0meter
+
+        DBG("UID NamespaceID = '0x");
+        for (size_t x = 0; x < UID_NAMESPACEID_SIZE; x++) { // 10B Namespace ID
+            Data[index++] = defaultUidNamespaceID[x];
+            DBG("%x,", defaultUidNamespaceID[x]);
+        }
+        DBG("'\r\n");
+
+        DBG("UID InstanceID = '0x");
+        for (size_t x = 0; x< UID_INSTANCEID_SIZE; x++) {   // 6B  Instance ID
+            Data[index++] = defaultUidInstanceID[x];
+            DBG("%x,", defaultUidInstanceID[x]);
+        }
+        DBG("'\r\n");
+
+        if (0 != uidRFU) {                                  // 2B RFU, include if non-zero, otherwise ignore
+            Data[index++] = (uint8_t)(uidRFU >> 0);
+            Data[index++] = (uint8_t)(uidRFU >> 8);
+        }
+        DBG("construcUIDFrame %d, %d", maxSize, index);
+        return index;
+    }
+
+    /**
+     *  Set Eddystone URL Frame information.
+     *  @param[in] power          TX Power in dB measured at 0 meters from the device.
+     *  @param[in] url            URL to encode
+     *  @param[in] urlAdvPeriodIn How long to advertise the URL frame (measured in # of adv periods)
+     *  @return false on success, true on failure.
+     */
+    bool setURLFrameData(int8_t power, const char *urlIn, float urlAdvPeriodIn) {
+        if (0.0f == urlAdvPeriodIn) {
+            urlIsSet = false;
+            return false;
+        }
+        encodeURL(urlIn, defaultUriData, defaultUriDataLength); // encode URL to URL Formatting
+        if (defaultUriDataLength > URI_DATA_MAX) {
+            return true;                                        // error, URL is too big
+        }
+        defaultUrlPower = power;
+        urlAdvPeriod = urlAdvPeriodIn;
+        urlIsSet     = true;
+        return false;
+    }
+
+    /**
+     *  Set Eddystone URL Frame information.
+     *  @param[in] power              TX Power in dB measured at 0 meters from the device.
+     *  @param[in] encodedUrlIn       Encoded URL
+     *  @param[in] encodedUrlInLength Length of the encoded URL
+     *  @param[in] urlAdvPeriodIn     How long to advertise the URL frame (measured in # of adv periods)
+     *  @return false on success, true on failure.
+     */
+    bool setURLFrameEncodedData(int8_t power, const char *encodedUrlIn, uint8_t encodedUrlInLength, float urlAdvPeriodIn) {
+        if (0.0f == urlAdvPeriodIn) {
+            urlIsSet = false;
+            return false;
+        }
+        memcpy(defaultUriData, encodedUrlIn, encodedUrlInLength);
+        if (defaultUriDataLength > URI_DATA_MAX) {
+            return true;                                        // error, URL is too big
+        }
+        defaultUrlPower      = power;
+        defaultUriDataLength = encodedUrlInLength;
+        urlAdvPeriod         = urlAdvPeriodIn;
+        urlIsSet             = true;
+        return false;
+    }
+
+    /*
+    *  Construct URL frame from private variables
+    *  @param[in/out] Data pointer to array to store constructed frame in
+    *  @param[in] maxSize number of bytes left in array, effectively how much emtpy space is available to write to
+    *  @return number of bytes used. negative number indicates error message.
+    */
+    int constructURLFrame(uint8_t *Data, uint8_t maxSize) {
+        int index = 0;
+        Data[index++] = FRAME_TYPE_URL;                     // 1B  Type
+        Data[index++] = defaultUrlPower;                    // 1B  TX Power
+        for (int x = 0; x < defaultUriDataLength; x++) {    // 18B of URL Prefix + encoded URL
+            Data[index++] = defaultUriData[x];
+        }
+        DBG("constructURLFrame: %d, %d", maxSize, index);
+        return index;
+    }
+
+    /*
+    *  Set Eddystone TLM Frame information.
+    *  @param[in] Version    of the TLM beacon data format
+    *  @param[in] advPeriod  how often to advertise the TLM frame for (in minutes)
+    *  @param batteryVoltage in milivolts
+    *  @param beaconTemp     in 8.8 floating point notation
+    *
+    */
+    void setTLMFrameData(uint8_t  version        = 0,
+                         float    advPeriod      = 60.0f,
+                         uint16_t batteryVoltage = 0,
+                         uint16_t beaconTemp     = 0x8000,
+                         uint32_t pduCount       = 0,
+                         uint32_t timeSinceBoot  = 0) {
+        if (0.0f == advPeriod) {
+            tlmIsSet = false;
+            return;
+        }
+        TlmVersion        = version;
+        TlmBatteryVoltage = batteryVoltage;
+        TlmBeaconTemp     = beaconTemp;
+        TlmPduCount       = pduCount;      // reset
+        TlmTimeSinceBoot  = timeSinceBoot; // reset
+        TlmAdvPeriod      = advPeriod;
+        tlmIsSet          = true;          // TLM Data has been enabled
+    }
+
+    /*
+    *  Construct TLM frame from private variables
+    *  @param[in/out] Data pointer to array to store constructed frame in
+    *  @param[in] maxSize number of bytes left in array, effectively how much emtpy space is available to write to
+    *  @return number of bytes used. negative number indicates error message.
+    */
+    int constructTLMFrame(uint8_t *Data, uint8_t maxSize) {
+        uint32_t now = timeSinceBootTimer.read_ms();
+        TlmTimeSinceBoot += (now - lastBootTimerRead) / 100;
+        lastBootTimerRead = now;
+
+        int index = 0;
+        Data[index++] = FRAME_TYPE_TLM;                    // Eddystone frame type = Telemetry
+        Data[index++] = TlmVersion;                        // TLM Version Number
+        Data[index++] = (uint8_t)(TlmBatteryVoltage >> 8); // Battery Voltage[0]
+        Data[index++] = (uint8_t)(TlmBatteryVoltage >> 0); // Battery Voltage[1]
+        Data[index++] = (uint8_t)(TlmBeaconTemp >> 8);     // Beacon Temp[0]
+        Data[index++] = (uint8_t)(TlmBeaconTemp >> 0);     // Beacon Temp[1]
+        Data[index++] = (uint8_t)(TlmPduCount >> 24);      // PDU Count [0]
+        Data[index++] = (uint8_t)(TlmPduCount >> 16);      // PDU Count [1]
+        Data[index++] = (uint8_t)(TlmPduCount >> 8);       // PDU Count [2]
+        Data[index++] = (uint8_t)(TlmPduCount >> 0);       // PDU Count [3]
+        Data[index++] = (uint8_t)(TlmTimeSinceBoot >> 24); // Time Since Boot [0]
+        Data[index++] = (uint8_t)(TlmTimeSinceBoot >> 16); // Time Since Boot [1]
+        Data[index++] = (uint8_t)(TlmTimeSinceBoot >> 8);  // Time Since Boot [2]
+        Data[index++] = (uint8_t)(TlmTimeSinceBoot >> 0);  // Time Since Boot [3]
+        DBG("constructURLFrame: %d, %d", maxSize, index);
+        return index;
+    }
+
+    /*
+    *  Update the TLM frame battery voltage value
+    *  @param[in] voltagemv Voltage to update the TLM field battery voltage with (in mV)
+    *  @return nothing
+    */
+    void updateTlmBatteryVoltage(uint16_t voltagemv) {
+        TlmBatteryVoltage = voltagemv;
+    }
+
+    /*
+    *  Update the TLM frame beacon temperature
+    *  @param[in] temp Temperature of beacon (in 8.8fpn)
+    *  @return nothing
+    */
+    void updateTlmBeaconTemp(uint16_t temp) {
+        TlmBeaconTemp = temp;
+    }
+
+    /*
+    *  Update the TLM frame PDU Count field
+    *  @param[in] pduCount Number of Advertisiting frames sent since powerup
+    *  @return nothing
+    */
+    void updateTlmPduCount(uint32_t pduCount) {
+        TlmPduCount = pduCount;
+    }
+
+    /*
+    *  Update the TLM frame Time since boot in 0.1s incriments
+    *  @param[in] timeSinceBoot Time since boot in 0.1s incriments
+    *  @return nothing
+    */
+    void updateTlmTimeSinceBoot(uint32_t timeSinceBoot) {
+        TlmTimeSinceBoot = timeSinceBoot;
+    }
+
+    /*
+    * Update advertising data
+    * @return true on success, false on failure
+    */
+    bool updateAdvPacket(uint8_t serviceData[], unsigned serviceDataLen) {
+        // Fields from the Service
+        DBG("Updating AdvFrame: %d", serviceDataLen);
+
+        ble.clearAdvertisingPayload();
+        ble.setAdvertisingType(GapAdvertisingParams::ADV_NON_CONNECTABLE_UNDIRECTED);
+        ble.setAdvertisingInterval(100);
+        ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
+        ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, BEACON_EDDYSTONE, sizeof(BEACON_EDDYSTONE));
+        ble.accumulateAdvertisingPayload(GapAdvertisingData::SERVICE_DATA, serviceData, serviceDataLen);
+
+
+        return true;
+    }
+
+    /*
+    *   State machine for switching out frames.
+    *   This function is called by the radioNotificationCallback when a frame needs to get swapped out.
+    *   This function exists because of time constraints in the radioNotificationCallback, so it is effectively
+    *   broken up into two functions.
+    */
+    void swapOutFrames(FrameTypes frameType) {
+        uint8_t  serviceData[SERVICE_DATA_MAX];
+        unsigned serviceDataLen = 0;
+        //hard code in the eddystone UUID
+        serviceData[serviceDataLen++] = BEACON_EDDYSTONE[0];
+        serviceData[serviceDataLen++] = BEACON_EDDYSTONE[1];
+
+        // if certain frames are not enabled, then skip them. Worst case TLM is always enabled
+        switch (frameType) {
+            case tlm:
+                // TLM frame
+                if (tlmIsSet) {
+                    DBG("Swapping in TLM Frame: version=%x, Batt=%d, Temp = %d, PDUCnt = %d, TimeSinceBoot=%d",
+                        TlmVersion,
+                        TlmBatteryVoltage,
+                        TlmBeaconTemp,
+                        TlmPduCount,
+                        TlmTimeSinceBoot);
+                    serviceDataLen += constructTLMFrame(serviceData + serviceDataLen, 20);
+                    DBG("\t Swapping in TLM Frame: len=%d", serviceDataLen);
+                    updateAdvPacket(serviceData, serviceDataLen);
+                }
+                break;
+            case url:
+                // URL Frame
+                if (urlIsSet) {
+                    DBG("Swapping in URL Frame: Power: %d", defaultUrlPower);
+                    serviceDataLen += constructURLFrame(serviceData + serviceDataLen, 20);
+                    DBG("\t Swapping in URL Frame: len=%d ", serviceDataLen);
+                    updateAdvPacket(serviceData, serviceDataLen);
+                    //switchFlag = false;
+                }
+                break;
+            case uid:
+                // UID Frame
+                if (uidIsSet) {
+                    DBG("Swapping in UID Frame: Power: %d", defaultUidPower);
+                    serviceDataLen += constructUIDFrame(serviceData + serviceDataLen, 20);
+                    DBG("\t Swapping in UID Frame: len=%d", serviceDataLen);
+                    updateAdvPacket(serviceData, serviceDataLen);
+                    //switchFlag = false;
+                }
+                break;
+            default:
+                ERR("You have not initialized a Frame yet, please initialize one before starting a beacon");
+                ERR("uidIsSet = %d, urlIsSet = %d, tlmIsSet = %d", uidIsSet, urlIsSet, tlmIsSet);
+        }
+    }
+
+    /*
+    * Callback to swap in URL frame
+    */
+    void urlCallback(void) {
+        DBG("urlCallback");
+        if (false == advLock) {
+            advLock = true;
+            DBG("advLock = url")
+            frameIndex = url;
+            swapOutFrames(frameIndex);
+            ble.startAdvertising();
+        } else {
+            // Someone else is broadcasting, toss it into the overflow buffer to retransmit when free
+            INFO("URI(%d) cannot complete, %d is currently broadcasting", url, frameIndex);
+            FrameTypes x = url;
+            overflow.push(x);
+        }
+    }
+
+    /*
+    * Callback to swap in UID frame
+    */
+    void uidCallback(void) {
+        DBG("uidCallback");
+        if (false == advLock) {
+            advLock = true;
+            DBG("advLock = uid")
+            frameIndex = uid;
+            swapOutFrames(frameIndex);
+            ble.startAdvertising();
+        } else {
+            // Someone else is broadcasting, toss it into the overflow buffer to retransmit when free
+            INFO("UID(%d) cannot complete, %d is currently broadcasting", uid, frameIndex);
+            FrameTypes x = uid; // have to do this to satisfy cont vs volatile keywords... sigh...
+            overflow.push(x);
+        }
+    }
+
+    /*
+    * Callback to swap in TLM frame
+    */
+    void tlmCallback(void) {
+        DBG("tlmCallback");
+        if (false == advLock) {
+            // OK to broadcast
+            advLock = true;
+            DBG("advLock = tlm")
+            frameIndex = tlm;
+            swapOutFrames(frameIndex);
+            ble.startAdvertising();
+        } else {
+            // Someone else is broadcasting, toss it into the overflow buffer to retransmit when free
+            INFO("TLM(%d) cannot complete, %d is currently broadcasting", tlm, frameIndex);
+            FrameTypes x = tlm;
+            overflow.push(x);
+        }
+    }
+
+    void stopAdvCallback(void) {
+        if (overflow.empty()) {
+            // if nothing left to transmit, stop
+            ble.stopAdvertising();
+            advLock = false; // unlock lock
+        } else {
+            // transmit other packets at current time index
+            FrameTypes x = NONE;
+            overflow.pop(x);
+            INFO("Re-Transmitting %d", x);
+            swapOutFrames(x);
+        }
+    }
+
+    /*
+    *  Callback from onRadioNotification(), used to update the PDUCounter and process next state.
+    */
+#define EDDYSTONE_SWAPFRAME_DELAYMS 1
+    void radioNotificationCallback(bool radioActive) {
+        // Update PDUCount
+        TlmPduCount++;
+        // True just before an frame is sent, false just after a frame is sent
+        if (radioActive) {
+            // Do Nothing
+        } else {
+            // Packet has been sent, disable advertising
+            stopAdv.attach_us(this, &EddystoneService::stopAdvCallback, 1);
+        }
+    }
+
+    /*
+    *   This function explicityly sets the parameters used by the Eddystone beacon.
+    *   this function should be used in leu of the config service.
+    *
+    *   @param bleIn ble object used to broadcast eddystone information
+    *   @param beaconPeriodus is how often ble broadcasts are mde, in mili seconds
+    *   @param txPowerLevel sets the broadcasting power level.
+    *
+    */
+    EddystoneService(BLEDevice &bleIn,
+                     uint16_t   beaconPeriodus = 100,
+                     uint8_t    txPowerIn      = 0) :
+        ble(bleIn),
+        advPeriodus(beaconPeriodus),
+        txPower(txPowerIn),
+        advLock(false),
+        frameIndex(NONE) {
+    }
+
+    /*
+    * @breif this function starts eddystone advertising based on configured frames.
+    */
+    void start(void) {
+        // Initialize Frame transition, start with URL to pass eddystone validator app on first try
+        if (urlIsSet) {
+            frameIndex = url;
+            urlTicker.attach(this, &EddystoneService::urlCallback, (float) advPeriodus / 1000.0f);
+            DBG("attached urlCallback every %d seconds", urlAdvPeriod);
+        }
+        if (uidIsSet) {
+            frameIndex = uid;
+            uidTicker.attach(this, &EddystoneService::uidCallback, uidAdvPeriod);
+            DBG("attached uidCallback every %d seconds", uidAdvPeriod);
+        }
+        if (tlmIsSet) {
+            frameIndex = tlm;
+            // Make double sure the PDUCount and TimeSinceBoot fields are set to zero at reset
+            updateTlmPduCount(0);
+            updateTlmTimeSinceBoot(0);
+            lastBootTimerRead = 0;
+            timeSinceBootTimer.start();
+            tlmTicker.attach(this, &EddystoneService::tlmCallback, TlmAdvPeriod);
+            DBG("attached tlmCallback every %d seconds", TlmAdvPeriod);
+        }
+        if (NONE == frameIndex) {
+            error("No Frames were Initialized! Please initialize a frame before starting an eddystone beacon.");
+        }
+        //uidRFU = 0;
+
+        ble.setTxPower(txPower);
+        ble.gap().onRadioNotification(this, &EddystoneService::radioNotificationCallback);
+    }
+
+private:
+
+    // Eddystone Variables
+    BLEDevice           &ble;
+    uint16_t            advPeriodus;
+    uint8_t             txPower;
+    Timer               timeSinceBootTimer;
+    volatile uint32_t   lastBootTimerRead;
+    volatile bool       advLock;
+    volatile FrameTypes frameIndex;
+    Timeout             stopAdv;
+
+
+    // URI Frame Variables
+    uint8_t             defaultUriDataLength;
+    UriData_t           defaultUriData;
+    int8_t              defaultUrlPower;
+    bool                urlIsSet;       // flag that enables / disable URI Frames
+    float               urlAdvPeriod;   // how long the url frame will be advertised for
+    Ticker              urlTicker;
+
+    // UID Frame Variables
+    UIDNamespaceID_t    defaultUidNamespaceID;
+    UIDInstanceID_t     defaultUidInstanceID;
+    int8_t              defaultUidPower;
+    uint16_t            uidRFU;
+    bool                uidIsSet;       // flag that enables / disable UID Frames
+    float               uidAdvPeriod;   // how long the uid frame will be advertised for
+    Ticker              uidTicker;
+
+    // TLM Frame Variables
+    uint8_t             TlmVersion;
+    volatile uint16_t   TlmBatteryVoltage;
+    volatile uint16_t   TlmBeaconTemp;
+    volatile uint32_t   TlmPduCount;
+    volatile uint32_t   TlmTimeSinceBoot;
+    bool                tlmIsSet;          // flag that enables / disables TLM frames
+    float               TlmAdvPeriod;      // number of minutes between adv frames
+    Ticker              tlmTicker;
+
+public:
+    /*
+     *  Encode a human-readable URI into the binary format defined by URIBeacon spec (https://github.com/google/uribeacon/tree/master/specification).
+     */
+    static void encodeURL(const char *uriDataIn, UriData_t uriDataOut, uint8_t &sizeofURIDataOut) {
+        DBG("Encode URL = %s", uriDataIn);
+        const char  *prefixes[] = {
+            "http://www.",
+            "https://www.",
+            "http://",
+            "https://",
+        };
+        const size_t NUM_PREFIXES = sizeof(prefixes) / sizeof(char *);
+        const char  *suffixes[]   = {
+            ".com/",
+            ".org/",
+            ".edu/",
+            ".net/",
+            ".info/",
+            ".biz/",
+            ".gov/",
+            ".com",
+            ".org",
+            ".edu",
+            ".net",
+            ".info",
+            ".biz",
+            ".gov"
+        };
+        const size_t NUM_SUFFIXES = sizeof(suffixes) / sizeof(char *);
+
+        sizeofURIDataOut = 0;
+        memset(uriDataOut, 0, sizeof(UriData_t));
+
+        if ((uriDataIn == NULL) || (strlen(uriDataIn) == 0)) {
+            return;
+        }
+
+        /*
+         * handle prefix
+         */
+        for (unsigned i = 0; i < NUM_PREFIXES; i++) {
+            size_t prefixLen = strlen(prefixes[i]);
+            if (strncmp(uriDataIn, prefixes[i], prefixLen) == 0) {
+                uriDataOut[sizeofURIDataOut++]  = i;
+                uriDataIn                      += prefixLen;
+                break;
+            }
+        }
+
+        /*
+         * handle suffixes
+         */
+        while (*uriDataIn && (sizeofURIDataOut < URI_DATA_MAX)) {
+            /* check for suffix match */
+            unsigned i;
+            for (i = 0; i < NUM_SUFFIXES; i++) {
+                size_t suffixLen = strlen(suffixes[i]);
+                if (strncmp(uriDataIn, suffixes[i], suffixLen) == 0) {
+                    uriDataOut[sizeofURIDataOut++]  = i;
+                    uriDataIn                      += suffixLen;
+                    break; /* from the for loop for checking against suffixes */
+                }
+            }
+            /* This is the default case where we've got an ordinary character which doesn't match a suffix. */
+            INFO("Encoding URI: No Suffix Found");
+            if (i == NUM_SUFFIXES) {
+                uriDataOut[sizeofURIDataOut++] = *uriDataIn;
+                ++uriDataIn;
+            }
+        }
+    }
+};
+
+#endif  // SERVICES_EDDYSTONEBEACON_H_
\ No newline at end of file