Only now I bought two boards on Aliexpress. I took it out of the package and checked it strictly following the instructions(Wiki getting started).
Unfortunately I can not get an answer OK.
At first I used SSCOM as stated on the wiki, but without success.
After that, I connected the boards to Raspberry Pi and just sent the lines to the preconfigured(115200 8n1) /dev/ttyUSB0 device.
rabbit@raspberrypi:~ $ echo -ne ‘at+\r\n’ >/dev/ttyUSB0
rabbit@raspberrypi:~ $ echo -ne ‘at+\n’ >/dev/ttyUSB0
rabbit@raspberrypi:~ $ echo -ne ‘AT+\r’ >/dev/ttyUSB0
Tell me, please, what else can I do to make these things to work?
Some pictures. The modules were in sealed bags, there was silica gel as well. I just pulled them out and tried to execute the simplest AT command.
As it turned out, it doesn’t understand 'AT’or ‘AT+’, but it responds to ‘AT+GMR’. ￼