Bluetoth module not discoverable!

Projects Networking, Protocols, and Devices
4

Hello,

did someone find solution for this issue? I am in similiar situation. I bought pack of 4x HC-06 modules. While 3 of them work as expected, last one is completly strange.

  1. It cannot be discovered by devices that had no problem to discover other 3 modules. (No Arduino, just 5V and ground.)

  2. It accepts AT+NAME command - this is different from original post.

  3. It replies to AT commands but not as expected. While 3 modules communicated at 9600 baud out of the box, this one did not communicate. I had an idea to set different baud rates and finally it replied at 4800 baud. So I issued AT+BAUD4 to set it to 9600. After "OK9600" I got Arduino back to 9600 baud and nothing! After some time I realised that actual communication speed is shifted by one. I mean, after AT+BAUD3 module communicates at 2400 baud, after AT+BAUD4 module communicates at 4800 baud, after AT+BAUD5 it communicates at 9600. Anyway, regardless of set speed this module is not discoverable.

Any idea what else to try? Contact the seller?

Thanks.