I am trying to send LinBus protocol serial commands over the ethernet port of my Raspberry pi to a linear actuator connected on the other end via ethernet.

Currently, I am using pyserial script to connect to /dev/ttyAMA0 on the pi and using socat to intercept traffic on that port and send it to the ethernet interface.

So far my test python script is:

import serial
serialport = serial.Serial("/dev/ttyAMA0", 5500, timeout=0.5)

I am using the following socat command:

sudo socat pty, link=/dev/ttyAMA0, raw tcp:

the ethernet interface has been configured to have the static ip as described in the socat command.

When I run the socat command I receive:

socat[852] E read(7, 0x143ad50, 8192): Connection refused

The Raspberry pi has been configured for UART and the /dev/ttyAMA0 port is shown when using ls /dev

Essentially, I am trying to send a special linbus frame containing serial byte commands such as "0x8000" from a Python script through the ethernet port to a linear actuator which is listening on the other end.

Am I approaching this the wrong way? If so, what do I need to do?

Thank you for your help!

  • 1
    You should just create a direct network connection to your destination, no need to redirect something with socat. You might consider socat if you have a program that insists on another interface and you can't modify it.
    – RalfFriedl
    Apr 25, 2019 at 13:53

1 Answer 1


/dev/ttyAMA0 is connected to Bluetooth

See How do I make serial work on the Raspberry Pi3 , Pi3B+, PiZeroW

  • I have changed the serial interface to /dev/serial0 but socat refuses to connect to that interface.
    – Jon Head
    Apr 26, 2019 at 1:53

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.