After a search I found that the serial.Serial module in Python can be used to read from and write to the cellular modem. I am able to connect and set up a PDP context. Next is to read GPIO, ADC and I2C from the OSG (and breakout) while in Python and report the results to an MQTT broker. I see where I can use the os module and use the os.system method to work with IO. If there is a more elegant way of doing this, please let me know.