1. As I have mentioned, the X-NUCLEO-IDB04A1 is broken, I guess that the tight socket makes me pull hard to break lines by mistake. I shall take care later on.

2 Luckly  X-NUCLEO-IDB05A1X-NUCLEO-IDB05A1 is still available for me to complete the BLE connection Here is the sample code form mbed

 


#include "mbed.h"
#include "ble/BLE.h"
#include "LEDService.h"


DigitalOut actuatedLED(LED1, 0);


const static char     DEVICE_NAME[] = "LED";
static const uint16_t uuid16_list[] = {LEDService::LED_SERVICE_UUID};


LEDService *ledServicePtr;


void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
{
    (void)params;
    BLE::Instance().gap().startAdvertising(); // restart advertising
}


/**
 * This callback allows the LEDService to receive updates to the ledState Characteristic.
 *
 * @param[in] params
 *     Information about the characterisitc being updated.
 */
void onDataWrittenCallback(const GattWriteCallbackParams *params) {
    if ((params->handle == ledServicePtr->getValueHandle()) && (params->len == 1)) {
        actuatedLED = *(params->data);
    }
}


/** 
 * This function is called when the ble initialization process has failled 
 */ 
void onBleInitError(BLE &ble, ble_error_t error) 
{ 
    /* Initialization error handling should go here */ 
} 


/** 
 * Callback triggered when the ble initialization process has finished 
 */ 
void bleInitComplete(BLE::InitializationCompleteCallbackContext *params) 
{
    BLE&        ble   = params->ble;
    ble_error_t error = params->error;


    if (error != BLE_ERROR_NONE) {
        /* In case of error, forward the error handling to onBleInitError */
        onBleInitError(ble, error);
        return;
    }


    /* Ensure that it is the default instance of BLE */
    if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
        return;
    }


    ble.gap().onDisconnection(disconnectionCallback);
    ble.gattServer().onDataWritten(onDataWrittenCallback);


    bool initialValueForLEDCharacteristic = true;
    ledServicePtr = new LEDService(ble, initialValueForLEDCharacteristic);


    /* setup advertising */
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.gap().setAdvertisingInterval(1000); /* 1000ms. */
    ble.gap().startAdvertising();


    while (true) {
        ble.waitForEvent();
    }
}


int main(void)
{
    BLE &ble = BLE::Instance();
    
    ble.init(bleInitComplete);
}

3. With Lightblue I can find the LED equiment and control from the console with 1 or 0 input to make the LED on or off

4. This is a simple test, therefore there is little to modify. The BLE service UUID is 0xA000 and BLE characteristic UUID is 0xA001. I can explore further with the design now.