esp_ble_gatts_set_attr_value，can not work！

[JonathanChenNew]

Hi
The function(esp_ble_gatts_set_attr_value) can not change attr_value.It returns OK,but when i use " esp_ble_gatts_get_attr_value",i found that the value has no change.And i have set "ESP_GATT_RSP_BY_APP".
My code:

Code: Select all

case ESP_GATTS_WRITE_EVT: {
		ESP_LOGI(UPDATE_GATTS_TAG, "GATT_WRITE_EVT, conn_id %d, trans_id %d, handle %d\n", param->write.conn_id, param->write.trans_id, param->write.handle);
		ESP_LOGI(UPDATE_GATTS_TAG, "GATT_WRITE_EVT, value len %d, value %08x\n", param->write.len, *(uint32_t *)param->write.value);
		LOG_ERROR("write value = %d\n",param->write.value[0]);
		esp_ble_gatts_set_attr_value(param->write.handle,param->write.len,param->write.value);
		esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, ESP_GATT_OK, NULL);

		break;
	}

Thanks!

[ESP_Angus]

Hi Jonathan,

Does the discussion in this Github issue apply to your code?
https://github.com/espressif/esp-idf/issues/428


Angus

[JonathanChenNew]

Hi Jonathan,

Does the discussion in this Github issue apply to your code?
https://github.com/espressif/esp-idf/issues/428


Angus

thank you
but it doesn't work.

[jesseb]

I haven't gotten the esp_ble_gatts_set_attr_value to work either. I can only change the value by remote writes. As far as I understand the esp_ble_gatts_set_attr_value is meant for when you use the attribute table and the control setting is ESP_GATT_AUTO_RSP. If it was ESP_GATT_RSP_BY_APP then you would simply use esp_ble_gatts_send_response when they read the value and cache whatever value passed when they the controller/client performs a write.

[tamhan]

Attention! The handle table is initialized ASYNC, as in, some time after the main stack is inited.

I solved this problem by updating the BLE store only on device connect.

Also, keep in mind that the method returns ESP_OK even if the handle is unitialiyed, in this case it just bins the result.