Using telemetry radio with Navio2 and mavros

Hi,

I have the following setup.
Ground Station laptop <—> (Navio2 + RPi)

I was able to get Mavros running on ground station and communicate with RPi using udp. However, when I try the same using Telemetry radio, I get the following error onboard RPi.

4239923 Error: i2c write failed. Reported -1 bytes written
4239933 Unable to reset device: -1
4239973 Error: i2c write failed. Reported -1 bytes written
4239982 error: request failed
4239988 error: pressure measure failed

Note, I assumed the UART port for RPi is /dev/ttyAMA0. (I’m not so sure of this though).

Any ideas on what could be the issue?

Thanks in advance
Prasanth