Hello! I’m using an A6 GSM module to send sensor data from my board to a server, using HTTP. The board sends a POST message and the server replies with 200 OK.
I want to be able to configure the board from the server. So, I need to send a POST message from the server to the board. The problem is that the server cannot connect to the board.
It is weird, since the connection status is OK (no TCPCLOSED message is generated from the A6 module). Also, in the above situation, the communication works, because the board receives the OK message from the server. It is like the A6 module needs to first send a HTTP message before receiving a message from the server; it cannot receive one without first sending a message.
This is my configuration:
Does anybody know what is the problem? Am I misunderstanding something here?