Here is my config.txt file
I have wired my connection with serial cable +5 Volt Power TX to RX / RX to TX and GND to GND.
I checked continuity of my serial cable and it all check outs.
I have swapped cables.
I am using TELEM2 on the Pixhawk 6C
I tried multiple baud rates.
I am concerned that I am not able to see a heart beat.
I have this in dmesg
[ 3.113454] uart-pl011 3f201000.serial: there is not valid maps for state default
[ 3.113713] uart-pl011 3f201000.serial: cts_event_workaround enabled
[ 3.113850] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 114, base_baud = 0) is a PL011 rev2
[ 3.195753] uart-pl011 3f201000.serial: no DMA platform data