[App_rpt-users] Raw DTMF Output

I want to be able to change my simplex node frequency via DTMF. I am going to use one of those chinese radio modules with the UART interface to a raspberry pi. I can't write a command for every single 440MHz or 144MHz frequency. I notice in the asterisk CLI, there is console output of DTMF duration and digits. Can I parse this output to a bash script? With RAW DTMF data, I could then create commands not using the star symbol, making it entirely different from the rpt.conf. 73 Skyler KD0WHB