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BLE ADV Gateway, converts advertisement to proper JSON serial output
Dependencies: BLE_API mbed mbedtls nRF51822
Diff: main.cpp
- Revision:
- 4:e5fa4c8838db
- Parent:
- 3:3eda308b78e6
- Child:
- 5:f4d74a8cad43
--- a/main.cpp Mon Jul 20 08:58:21 2015 +0000 +++ b/main.cpp Fri Jul 31 09:11:43 2015 +0000 @@ -17,51 +17,48 @@ #include "mbed.h" #include "ble/BLE.h" -#include "ble/DiscoveredCharacteristic.h" -#include "ble/DiscoveredService.h" #include "TMP_nrf51/TMP_nrf51.h" -#define COMP_ID_TEST 0xFEFE +#define APP_SPECIFIC_ID_TEST 0xFEFE #pragma pack(1) -typedef struct manufacturerData { - uint16_t companyId; - /* User defined manufacture data */ - TMP_nrf51::tmpSensorValue_t tmpSensorValue; -} manufacturerData_t; +struct ApplicationData_t { + uint16_t applicationSpecificId; /* An ID used to identify temperature value + in the manufacture specific AD data field */ + TMP_nrf51::tmpSensorValue_t tmpSensorValue; /* User defined application data */ +}; #pragma pack() BLE ble; TMP_nrf51 tempSensor; DigitalOut alivenessLED(LED1, 1); -static bool triggerTempValueRead = true; +static bool triggerTempValueUpdate = false; void periodicCallback(void) { /* Do blinky on LED1 while we're waiting for BLE events */ alivenessLED = !alivenessLED; - triggerTempValueRead = true; + triggerTempValueUpdate = true; +} + +void accumulateApplicationData(ApplicationData_t &appData) +{ + appData.applicationSpecificId = APP_SPECIFIC_ID_TEST; + /* Read a new temperature value */ + appData.tmpSensorValue = tempSensor.get(); } void temperatureValueAdvertising(void) { - manufacturerData_t manuData; - manuData.companyId = COMP_ID_TEST; + ApplicationData_t appData; - /* Read a new temperature value */ - manuData.tmpSensorValue = tempSensor.get(); - printf("Temp is %f\r\n", (float)manuData.tmpSensorValue); - - /* Stop advertising and clear the payload if in advertising state */ - if((ble.gap().getState()).advertising == 1) { - ble.gap().stopAdvertising(); - ble.gap().clearAdvertisingPayload(); - } + accumulateApplicationData(appData); + //printf("Temp is %f\r\n", (float)appData.tmpSensorValue); /* Setup advertising payload */ ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE); /* Set flag */ ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_THERMOMETER); /* Set appearance */ - ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA, (uint8_t *)&manuData, sizeof(manufacturerData_t)); /* Set data */ + ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA, (uint8_t *)&appData, sizeof(ApplicationData_t)); /* Set data */ /* Setup advertising parameters */ ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_NON_CONNECTABLE_UNDIRECTED); ble.gap().setAdvertisingInterval(500); @@ -69,18 +66,35 @@ ble.gap().startAdvertising(); } +void updateSensorValueInAdvPayload(void) +{ + ApplicationData_t appData; + + accumulateApplicationData(appData); + + /* Stop advertising first */ + ble.gap().stopAdvertising(); + /* Only update temperature value field */ + ble.gap().updateAdvertisingPayload(GapAdvertisingData::MANUFACTURER_SPECIFIC_DATA, (uint8_t *)&appData, sizeof(ApplicationData_t)); + /* Start advertising again */ + ble.gap().startAdvertising(); +} + int main(void) { Ticker ticker; - /* Refresh temperature value every 2 seconds */ + /* Enable trigger every 2 seconds */ ticker.attach(periodicCallback, 2); ble.init(); - + /* Start temperature advertising */ + temperatureValueAdvertising(); + while (true) { - if (triggerTempValueRead) { - temperatureValueAdvertising(); - triggerTempValueRead = false; + if (triggerTempValueUpdate) { + /* Update temperature value */ + updateSensorValueInAdvPayload(); + triggerTempValueUpdate = false; } ble.waitForEvent(); }