I have two HC-05 modules and want to communicate between them (one in master mode, the other as slave). I have the Module types with EN pin ans a little button on the PCB. Both Modules, I resetted with the ORGL command, so they both have default setting.
First Module: I just power on with no connection of EN pin. Module starts and the LED is blinking fast.
Second Module: I set EN pin to High and power on the Module. Module starts and the LED is 2seconds on/2seconds off, so Im in the command mode.
Now I send following commands to the Module:
AT
OK
AT+VERSION
+VERSION:4.0-20190815
OK
AT+ORGL
OK
AT+ROLE=1
OK
AT+RESET
OK
AT+INIT
ERROR: [0]
AT+RMAAD
OK
AT+INQ
+INQ:0021:04:062C93,1F00,FFD0,HC-05
OK
AT+STATE?
+STATE:INITIALIZED
OK
AT+PAIR=0021,04,062C93
---> No answer
First I'm wondering: The module is always in state "initialized". I have never seen any other stade. I suggest something like "READY" or "PAIRABLE", but get never this states. Is there any delailed description what the states exaclty mean? I didn't found details about them.
Second I'm wondering: The init command sends ERROR0, so it seems that the module didn't know this command? On all tutorials in the internet, this command is used, I have never read about that this command may not exists on some modules?
Third I'm wondering: AT+RAIR returns no answer. I also tryed to send the pin 1234 after entering this command (I read this in another thread), but still nothing hapens. --> Maybe this is not working, because the state is INITIALIZED instead of ready or pairable?
On another Thread I read that there are two command modes for HC-05, one with a reduced command set, but this not seems to be the problem, because in the reduced command set normally INQ is not working, but this command is working here. So, i suggest, it has something to do with the state of the module. Why its always INITIALIZED? Never READY or PAIRABLE? I have tryed the procedure with both modules. Both have the same behavoir.
Any ideas whats wrong?
