FCM360W BLE Power Control

WIFI/BT Hardware
1

Hi,

Is it possible to reduce power level in FCM360W BLE application because we don’t want to have BLE connection from far away. We are using BLE in central mode.

Thanks.

2

Hi Muhammad,

Yes it is possible to reduce the power level, but right now i dont think it is available in the AT commands. Are you using AT solution or QuecOpen solution right now on the module?

3

Hi,

We are using AT Commands right now.

4

Hi,

Let me discuss this internally to see whether we can add a new AT command for transmit power control. Please note that even if we can implement it, the firmware development and release process may take some time. Would that timeline be acceptable for your project?

However, based on my understanding, your device is operating in Central mode. In this case, could you help clarify the purpose of adjusting the transmit power level? Since the Central device actively scans and initiates the connection, configuring the transmit power alone may not be the most effective approach if your goal is to connect only to nearby peripherals.

Instead, I would suggest filtering the scanned devices based on their RSSI before initiating the connection.

If you are using the standard AT command firmware with an external host MCU (such as STM32, ESP32, Arduino, or PIC), the implementation can be handled by your MCU:

  1. Send AT+QBLESCAN=2,<timeout> to start scanning.

  2. The module will return the scanned devices in the following format:

    +QBLESCAN: <name>,<address_type>,<BLE_addr>,<RSSI>,<adv_data>

  3. Your MCU can parse the returned RSSI value.

  4. If the RSSI exceeds your predefined threshold, your MCU can then issue AT+QBLECONN=... to establish the connection.

This approach allows you to connect only to devices within your desired signal range without requiring additional firmware changes.

Alternatively, if your product is still in the R&D stage, you may consider using QuecOpen, depending on your application requirements. QuecOpen provides greater flexibility for implementing custom connection logic, transmit power control, and other application-specific features.

I’ll send you an email shortly. Could you please help fill in the attached questionnaire? It will help us evaluate your request and coordinate the development internally.

Thank you, and I look forward to your reply.