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You can have a look at ROS' code, but it may be convoluted to follow. The karel manual has an example in it of how to set up a client connection, it's best to start with that. You need to setup the connection parameters from the TP (Menu>Setup>Host comm.) and then the port in $HOSTC_CFG.$SERVER_PORT. You have to follow the setup procedure from the karel manual to the letter or it will not work, I really mean it, follow every step, initialize when you're told, set the variables after the initialization, and so on. Then it's pretty straightforward, from karel you'll open the configured client (C1:) and start sending and receving data. You'll have to implement some basic string functions, but there're arent many caveats.