add special char tx rx test
add special char tx rx test

akuhtz/serial-communication-manager,RishiGupta12/SerialPundit,RishiGupta12/serial-communication-manager,RishiGupta12/SerialPundit,RishiGupta12/SerialPundit,akuhtz/serial-communication-manager,RishiGupta12/serial-communication-manager,RishiGupta12/serial-communication-manager,RishiGupta12/SerialPundit,akuhtz/serial-communication-manager,akuhtz/serial-communication-manager