Not Able to Connect to Mission Planner via /dev/ttyAMA0

1) Image and ArduPilot version.
pi@navio:~ $ sudo emlidtool info
Product: Navio 2
Issue: Emlid 2017-09-22 94b6586ea415c117b57d0d9eed9fc2df0bf1bcfd
Kernel: 4.9.45-94f47ec-emlid-v7+

  1. Detailed problem description. How does observed behavior differ from the expected one?

Attempting to connect Dragon Link Large 12ch Receiver to NAVIO2 UART
It appears that /dev/ttyAMA0 only returns 190 bytes and then stops upon connection request over UDP @57600 baud

  1. Your step by step actions.

Verified Arduplane Configuration:
pi@navio:~ $ sudo nano /etc/default/arduplane
GNU nano 2.7.4 File: /etc/default/arduplane

Default settings for ArduPilot for Linux.

The file is sourced by systemd from arduplane.service

TELEM1="-A udp:"
TELEM2="-C /dev/ttyAMA0"
TELEM3="-D /dev/ttyUSB0"

Options to pass to ArduPilot


  1. Picture of the setup and connection scheme.

Will provide upon request…but only Tx, Rx and Gnd connected to each device with TX and Rx crossed… Common TTL Serial connections

  1. If using any additional hardware please provide exact make and model.

Also tested with TTL to Ethernet adapter and adapter software shows connected but, also shows Net traffic data streaming but COM data hangs after 190 bytes

Really? 7 hours and not one Suggestion or Comment…Is this a bug, bad config…gimme something

Reloaded “Stretch” on a new SD card…did all the configs…tested the UART with Serial Adapter using UDP and Tested with FTDI to UART via COMxx and all work perfect.
So… We have a non-issue

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