Bluetooth door lock

[TomWang]

Hi

I have a custom who is using 52832 to develop a Bluetooth door lock, including a NB-iot module, The door lock is unlocked via app Bluetooth.

the question is : There is a certain probability that Bluetooth can't connect to the mobile phone, or after using the app to unlock, there is a certain probability that Bluetooth will be disconnected. At this time, Bluetooth can't be found by using another mobile phone, and other mobile phones can't find Bluetooth until the Bluetooth of the first mobile phone is turned off.

Test approach:
① Separate NB from Bluetooth power supply;
② no shell is installed and FPC antenna is used to lead out;
③ Disconnect the power supply of the motor;
None of the above test methods solve the problem.

the app log is as below:

and I don't know what the line 466 means

Best Regards!!!

[run_ar]

Hi,

Not sure I understand exactly what your questions is. But you are right that some phones will automatically try to reconnect to a bonded device. This will potentially block the device from being used by other users while the Auto-reconnect-device is within range.

[TomWang]

I mean the Bluetooth connection is not stable. Sometimes the Bluetooth will be disconnected after the door is opened. The non directional broadcast package is used. and I want to know how to troubleshoot, thx!

[run_ar]

Have you checked the LF clk source? is this RC or Xtal? Are they using the correct loading capacitors? What is the connection supervision timeout?

If they are using an external crystal, you could ask them to try the RC and/or 500 ppm setting to see if this improves performance.

[TomWang]

I checked the clk source, it's using 2 external crystal: 32M 12pf ±20ppm and 32.768KHz ±20ppm, and we have tested the RF performance, no problem found. so I suspect there is some problem in underlying interaction. but I don't know the details.

[run_ar]

Is it possible to capture a sniffertrace of the connection to see what is happening?