BLUENRG-M0A: Characteristics Overwritten when Specific UUIDs Are Used
- March 9, 2023
- 1 reply
- 1053 views
Hello,
I am writing some BLE firmware using the BlueNRG-M0A model on a Nucleo board to try and develop an understanding. To try and build an understanding, I am creating multiple services and characteristics with different functions (read only, read/write, etc.) and I am noticing a problem when I try to use the ST BLE Toolbox to verify the proper setup, I notice that certain UUIDs cause previously created characteristics to be overwritten.
For example, when I use the following UUIDs, all only the last characteristic (E909930B-39D7-0000-8FE12A48A02B36E6) is visible in the ST BLE Toolbox.
Characteristic UUIDs:
E909900B-39D7-0000-8FE12A48A02B36E6
E909910B-39D7-0000-8FE12A48A02B36E6
E909920B-39D7-0000-8FE12A48A02B36E6
E909930B-39D7-0000-8FE12A48A02B36E6
Then, when I use the following UUIDs, all the characteristics are visible in the ST BLE Toolbox.
Characteristic UUIDs:
E909900B-39D7-0000-8FE12A48A02B36E6
E919900B-39D7-0000-8FE12A48A02B36E6
E929900B-39D7-0000-8FE12A48A02B36E6
E939900B-39D7-0000-8FE12A48A02B36E6
Can anyone explain what would cause this?
Here is the code snippet for creating the service and the character handles:
#define COPY_BATTERY_SERVICE_UUID(uuid_struct) COPY_UUID_128(uuid_struct,0xE9,0x09,0x90,0x0B,0x39,0xD7,0x00,0x00,0x8F,0xE1,0x2A,0x48,0xA0,0x2B,0x36,0xE6)
#define COPY_BATTERY_SOC_CHAR_UUID(uuid_struct) COPY_UUID_128(uuid_struct,0xE9,0x09,0x91,0x0B,0x39,0xD7,0x00,0x00,0x8F,0xE1,0x2A,0x48,0xA0,0x2B,0x36,0xE6)
#define COPY_VOLTAGE_POWER_CHAR_UUID(uuid_struct) COPY_UUID_128(uuid_struct,0xE9,0x09,0x92,0x0B,0x39,0xD7,0x00,0x00,0x8F,0xE1,0x2A,0x48,0xA0,0x2B,0x36,0xE6)
#define COPY_TEMPERATURE_CHAR_UUID(uuid_struct) COPY_UUID_128(uuid_struct,0xE9,0x09,0x93,0x0B,0x39,0xD7,0x00,0x00,0x8F,0xE1,0x2A,0x48,0xA0,0x2B,0x36,0xE6)
....
tBleStatus Add_Battery_Service(void)
{
tBleStatus ret;
//int32_t NumberOfCharacters=3;
uint8_t uuid[16];
COPY_BATTERY_SERVICE_UUID(uuid);
BLUENRG_memcpy(&service_uuid.Service_UUID_128, uuid, 16);
ret = aci_gatt_add_serv(UUID_TYPE_128, service_uuid.Service_UUID_128, PRIMARY_SERVICE,
16, &BatteryServHandle);
if (ret != BLE_STATUS_SUCCESS) {
goto fail;
}
COPY_BATTERY_SOC_CHAR_UUID(uuid);
BLUENRG_memcpy(&char_uuid.Char_UUID_128, uuid, 16);
ret = aci_gatt_add_char(BatteryServHandle, UUID_TYPE_128, char_uuid.Char_UUID_128,
2+4,
CHAR_PROP_NOTIFY|CHAR_PROP_READ,
ATTR_PERMISSION_NONE,
GATT_NOTIFY_READ_REQ_AND_WAIT_FOR_APPL_RESP,
16, 0, &SOC_CharHandle);
COPY_VOLTAGE_POWER_CHAR_UUID(uuid);
BLUENRG_memcpy(&char_uuid.Char_UUID_128, uuid, 16);
ret = aci_gatt_add_char(BatteryServHandle, UUID_TYPE_128, char_uuid.Char_UUID_128,
2+4,
CHAR_PROP_NOTIFY|CHAR_PROP_READ,
ATTR_PERMISSION_NONE,
GATT_NOTIFY_READ_REQ_AND_WAIT_FOR_APPL_RESP,
16, 0, &VoltagePowerCharHandle);
COPY_TEMPERATURE_CHAR_UUID(uuid);
BLUENRG_memcpy(&char_uuid.Char_UUID_128, uuid, 16);
ret = aci_gatt_add_char(BatteryServHandle, UUID_TYPE_128, char_uuid.Char_UUID_128,
2+4,
CHAR_PROP_NOTIFY|CHAR_PROP_READ,
ATTR_PERMISSION_NONE,
GATT_NOTIFY_READ_REQ_AND_WAIT_FOR_APPL_RESP,
16, 0, &TemperatureCharHandle);
if (ret != BLE_STATUS_SUCCESS) {
goto fail;
}
return BLE_STATUS_SUCCESS;
fail:
return BLE_STATUS_ERROR;
}