File content as of revision 3:d6f80e11a7f4:

#include "mbed.h"
#include "ble/BLE.h"
#include "ble/DiscoveredCharacteristic.h"
#include "ble/DiscoveredService.h"
#include "ble/GapScanningParams.h"
#include "ble_radio_notification.h"
#include "ble_gap.h"

BLE ble;
Serial pc(USBTX, USBRX);

const uint8_t MPU6050_service_uuid[] = {
    0x45,0x35,0x56,0x80,0x0F,0xD8,0x5F,0xB5,0x51,0x48,0x30,0x27,0x06,0x9B,0x3F,0xD9
};

const uint8_t MPU6050_Accel_Characteristic_uuid[] = {
    0x45,0x35,0x56,0x81,0x0F,0xD8,0x5F,0xB5,0x51,0x48,0x30,0x27,0x06,0x9B,0x3F,0xD9
};

DiscoveredCharacteristic accelChar;
UUID serviceUUID(MPU6050_service_uuid);
UUID accelUUID(MPU6050_Accel_Characteristic_uuid);

#define NUMBER_OF_PERIPHERALS 3

typedef struct {
    Gap::Handle_t   handle;
    Gap::Address_t  address;
    bool    connected;
    uint8_t*    deviceName;
} peripheral_t;

static peripheral_t gs_peripheral[NUMBER_OF_PERIPHERALS];

uint32_t ble_advdata_parser(uint8_t type, uint8_t advdata_len, uint8_t *p_advdata, uint8_t *len, uint8_t *p_field_data)
{
    uint8_t index=0;
    uint8_t field_length, field_type;
    
    while(index<advdata_len)
    {
        field_length = p_advdata[index];
        field_type   = p_advdata[index+1];
        if(field_type == type)
        {
            memcpy(p_field_data, &p_advdata[index+2], (field_length-1));
            *len = field_length - 1;
            return NRF_SUCCESS;
        }
        index += field_length + 1;
    }
    return NRF_ERROR_NOT_FOUND;
}

void scanCallback(const Gap::AdvertisementCallbackParams_t *params) {
    pc.printf("adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n",
           params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2], params->peerAddr[1], params->peerAddr[0],
           params->rssi, params->isScanResponse, params->type);
    
    uint8_t len;
    uint8_t adv_name[31];
    if( NRF_SUCCESS == ble_advdata_parser(BLE_GAP_AD_TYPE_COMPLETE_LOCAL_NAME,
                             params->advertisingDataLen,
                            (uint8_t *)params->advertisingData, &len, adv_name)){

        for(uint8_t i=0; i<3; i++){
            if(gs_peripheral[i].connected == false){
                memcpy(gs_peripheral[i].address, params->peerAddr, sizeof(params->peerAddr)); 
                gs_peripheral[i].deviceName = adv_name;
                ble.connect(params->peerAddr, BLEProtocol::AddressType::RANDOM_STATIC, NULL, NULL);
                break;
            }
        }
        ble.stopScan();
    }
}

void serviceDiscoveryCallback(const DiscoveredService *service) {
    pc.printf("service found...\r\n");    
}

void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) {
    pc.printf("characteristicDiscoveryCallback\r\n");
    
    accelChar = *characteristicP;
    
    for(uint8_t i=0; i<3; i++){
        if(gs_peripheral[i].connected){
            ble.gattClient().read(characteristicP->getConnectionHandle(), characteristicP->getValueHandle(), 0);
        }
    }

}

void connectionCallback(const Gap::ConnectionCallbackParams_t *params) {
    pc.printf("GAP_EVT_CONNECTED\r\n");
    if (params->role == Gap::CENTRAL) {

        for(uint8_t i=0; i<3; i++){
            if(gs_peripheral[i].connected == false){
                gs_peripheral[i].handle = params->handle;
                gs_peripheral[i].connected = true;
                break;
            }
        }
                
        ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, serviceUUID, accelUUID);
        
    }
}

void discoveryTerminationCallback(Gap::Handle_t connectionHandle) {
    pc.printf("terminated SD for handle %u\r\n", connectionHandle);
}

void triggerRead(const GattReadCallbackParams *response) {
    pc.printf("triggerRead.....\r\n");
    
    pc.printf("len: %d\r\n", response->len);
    const uint8_t *data = response->data;
    pc.printf("data ");
    for(int i=0; i < response->len; i++){
        pc.printf("%f ", (float)data[i]);  
    }
    pc.printf("\r\n");
    accelChar.read();
}

void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params){
    pc.printf("disconnected\r\n");
    
    for(uint8_t i=0; i<3; i++){
        if(gs_peripheral[i].handle == params->handle){
            gs_peripheral[i].connected = false;
            gs_peripheral[i].handle = 0xFFFF;
        }
    }
    wait(8.0);
    ble.gap().startScan(scanCallback);
}

int main(void) {
    pc.baud(9600);
    wait(8.0);
    pc.printf("start\r\n");

    ble.init();

    ble.onConnection(connectionCallback);
    ble.onDisconnection(disconnectionCallback);
    ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
    ble.gattClient().onDataRead(triggerRead);
    //ble.gattClient().onDataWrite(triggerToggledWrite);

    ble.gap().setScanParams(500, 400);
    ble.gap().startScan(scanCallback);

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