I'm using a pair of XT09-SI devices with firmware version 2067 in a rocket telemetry application. I want to take advantage of binary commands so I can monitor power levels, temperature, etc. without affecting the data stream. However, I've used up all the GPIO pins on my MCU so all I have is RX, TX, and one extra line I can use for CMD. I was able to use the CMD to send binary commands to the unit but without CTS connected, I cannot reliably differentiate the binary responses from the normal data. The API mode sounds like an option but it doesn't appear the XTend Hopping firmware supports binary commands using the API mode. However, the Mesh firmware appears to support the full command set so can I use the Mesh firmware in a point-to-point mode to access binary commands using API mode? Are there any disadvantages of using the Mesh firmware? Most of the data in my application will be sent periodically from the vehicle to the ground so I was planning to set RR=0 (no retries) on the vehicle but set RR=20 on the ground to increase the chance of a short command making it back up to the vehicle.