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if you look in the code you will see a call for setting the baud rate in turtlebot_driver.py... create the SCI interface with the desired baud (something like self.sci= SerialCommandInterface(tty, YOURBAUD)) which basically calls serial with the baudrate

if you would like to change the baudrate and port at a higher level change the turtlebot launch file to use the desire port and baud rate. both parameters are exposed at the node level in turtlebot_node.py