RE: GATT profile : value updation

[sid]

Hi,

We are working with the nrf51822 on mBed platform

We have created the following profile under deviceinformationservices

in main.c

uint8_t DataCounter = 100; 

in void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)

  deviceInfo = new DeviceInformationService(ble, "ARM", "Model1", "SN1", "hw-rev1", "fw-rev1", "soft-rev1","ON");

in while loop

    DataCounter++;
    if (DataCounter == 175) { 
        DataCounter = 100;
        }            
deviceInfo->updateDataRate(DataCounter);

in deviceinformationsevices.h

in the constructor added the following
 uint8_t DataCounter  = NULL   
 valueBytes(DataCounter),
        emailStringCharacteristic(GattCharacteristic::UUID_EMAIL_ADDRESS,
                                              &DataCounter,
                                             (DataCounter != NULL) ? sizeof(DataCounter) : 0, /* Min length */
                                             (DataCounter != NULL) ? sizeof(DataCounter) : 0, /* Max length */
                                           GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ )
     GattCharacteristic *charTable[] = {&emailStringCharacteristic}; //Added Idris here

class function
    void updateDataRate(uint8_t DataCounter) {
        valueBytes.updateDataRate(DataCounter);
        ble.gattServer().write(emailStringCharacteristic.getValueHandle(), valueBytes.getPointer(), valueBytes.getNumValueBytes());
    }

private:
    BLE                &ble;
    GattCharacteristic  emailStringCharacteristic;

We are unable to update the data with the above updates kindly help us with the same.

Thanks and regards. Siddharth

[Hung Bui]

Hi Siddharth, For mbed question, it's better that you ask on the mbed forum where there are more people using mbed.

You may want to share the whole project, or the example you are following. I actually don't understand why mbed has a write() function for a gattServer.