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Configuration File Location

The systemd configuration files for AMBEserver are located in /etc/opendv

cd /etc/opendv
ls -1


If your device is at a different location, e.g. /dev/ttyUSB1 simply copy the similar file and give it a new name with the new device

sudo cp ambeserver-ttyUSB0.conf ambeserver-ttyUSB1.conf	

Modifying the Configuration File

Use an editor like vi or nano to edit your configuration file

sudo vi /etc/opendv/ambeserver-ttyUSB0.conf	

There are two environment variables that may be modified namely UDP_PORT and AMBESERVER_FLAGS

Here are the contents of the configuration file:

# Configuration file for the AMBEserver program started by systemd.
# Adding flags to AMBESERVER_FLAGS will pass this to the daemon.
# For example, to change the speed to 460800, use the following line:
# AMBESERVER_FLAGS="-s 460800"


For example, on the newer ThumbDV™ (Rev. A) you would modify the AMBESERVER_FLAGS variable


To have AMBEserver listen on another UDP port, which is useful if you have more than one AMBEserver running on a single Raspberry Pi -- each with its own AMBE device.


Managing the AMBEserver

The commands for checking, starting, stopping, enabling, and disabling the AMBEserver are as follows (modify the tty service name as appropriate.

sudo systemctl status ambeserver@ttyUSB0.service
sudo systemctl start ambeserver@ttyUSB0.service
sudo systemctl stop ambeserver@ttyUSB0.service
sudo systemctl enable ambeserver@ttyUSB0.service
sudo systemctl disable ambeserver@ttyUSB0.service

Enabling the service will allow the AMBEserver to automatically restart when the Raspberry Pi is restarted.

Testing the AMBEserver

Login to and download from the file section

Execute the script


If the script returns (repeatedly):
Server reply : a

You have an operating AMBEserver. Use control-C to escape/kill the test.

NW Digital Radio is in the process of setting up various community groups at Please create a personal account at Join the main NW Digital group by sending an email from your registered email account to and then send an email to Please use the group for questions and to share your experiences, so that all ThumbDV™, PiDV™, AMBEserver users can benefit from the replies.