Make Raspberry Pi Serial port available over Ethernet
To do this on raspberry-pi first install socat.
Then run following commands.
- On the raspberry-pi run following command to redirect tcp data on port 54321 to serial port ttyAMA0
sudo socat tcp-l:54321,reuseaddr,fork file:/dev/ttyAMA0, nonblock, raw, waitlock=/var/run/ttyAMA0.lock
- On other connecting(client) linux machine run following command to create a virtual serial port and direct it to tcp port of the raspberry-pi 54321 port.
sudo socat pty,link=/dev/ttyAMA0,waitslave tcp:10.42.0.3:54321
- Now when you write to virtual serial port on the linux pc it get to the actual serial port of raspberry-pi over ethernet connection. However this seems to be a blocking the port.
- Checked on pi4j read/write on same port and read hangs. So as a solution to this create another virtual serial port on raspberry pi and map it to actual serial port. Then read/write to it. It fixed the problem.
sudo socat PTY,link=/dev/ttyAMA0 PTY,link=/dev/ttyAMA1
Srinath Gamage has attached the following document:
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