Make Raspberry Pi Serial port available over Ethernet

Make Raspberry Pi Serial port available over Ethernet

To do this on raspberry-pi first install socat.

Then run following commands.

1. 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

2. 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

3. 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.
4. 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:

Make Serial port available over Ethernet

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Make Raspberry Pi Serial port available over Ethernet

Serial Communication Test on Raspberry-pi

Serial Communication Test on Raspberry-pi

1. First we have to disable OS from using serial port

2. Just for the testing; Connect TxRx pin 8 and 10 on pin header with a jumper(cable).

3. Then write to Serial port with following python code.

#!/usr/bin/env python

import time

import serial

ser = serial.Serial(

            port='/dev/ttyAMA0',

            baudrate = 9600,

            parity=serial.PARITY_NONE,

            stopbits=serial.STOPBITS_ONE,

            bytesize=serial.EIGHTBITS,

            timeout=1

)

counter=0

while 1:

            print counter

            ser.write('Write counter: %d \n'%(counter))

            time.sleep(1)

            counter += 1

4. Use following code to read it

#!/usr/bin/env python

import time

import serial

ser = serial.Serial(

                   port='/dev/ttyAMA0',

                   baudrate = 9600,

                   parity=serial.PARITY_NONE,

                   stopbits=serial.STOPBITS_ONE,

                   bytesize=serial.EIGHTBITS,

                   timeout=1

               )

counter=0

while 1:

  x=ser.readline()

  print x

Srinath Gamage has attached the following document:

Serial Communication Test on Raspberry-pi

Google Docs: Create and edit documents online.

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Serial Communication Test on Raspberry-pi

Add current RSA keys for password less login

cat .ssh/id_rsa.pub | ssh remoteLoginUser@172.1.1.1  'cat >> .ssh/authorized_keys'

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Add current RSA keys for password less login