How slave data send to master?

I have system like one master and 20 energy meter as slave device. I am reading fixed 10 holding register and 10 coil register from each slave. Baud rate : 9600, Parity : even, Data bit : 8 Response...
How slave data send to master?

I have system like one master and 20 energy meter as slave device. I am reading fixed 10 holding register and 10 coil register from each slave. Baud rate : 9600, Parity : even, Data bit : 8 Response...
How is send data without lwip func.

Hi; i use lwip tcp/ip raw.. tcp_echoserver.c is running my project.It's working no problem. But i want send data while loop in main.c.. i write; while(1) { mx_lwip_process(); hal_delay(250);...
How is send data without lwip func.

Hi; i use lwip tcp/ip raw.. tcp_echoserver.c is running my project.It's working no problem. But i want send data while loop in main.c.. i write; while(1) { mx_lwip_process(); hal_delay(250);...
how to send data from open cv to arm7

I am working on a project using arm7. Ihave done image processing in opencv and want to send the data to arm7 microcontroller.