Newsletters

This article is about how to create national and local service of Newsletters

Concept

AutoPatch application could help to organize regular transmission of pre-recorded newsletters.

AutoPatch can be configured to transmit any PCM audio to a talking group from pre-defined ID
One of supported AMBE dongles is required to provide PCM to AMBE trascoding
Pre-recorded newsletter in .wav format can be played by aplay with scheduling by cron

Limitations

Audio file should be PCM 16 bit with rate of 8000 Hz

Example of configuration

AutoPatch

Cord10 :
{
  // Patch ID
  number = 14;
  // Codec type:
  // AMBEServer - to use with AMBEserver or dvemu (please check https://github.com/dl5di/OpenDV/tree/master/DummyRepeater)
  // USB Dongle - to use with DVSI USB-3000, NW ThumbDV Model A or DV3K Dongle (baud-rate 460800)
  // DV3000U - to use with old NW DV3000U (baud-rate 230400)
  type = "AMBEServer";
  location = "192.168.0.2:2460";
  // ALSA input and output devices
  input = "hw:Loopback,0,4";
  output = "hw:Loopback,1,6";
  // Outgoing session parameters (optional)
  mode = "Group";
  source = 2049757;
  destination = 2048;
};

Shell script

!/bin/bash

FILE=newsletter.wav

if [ -e $FILE ] then

 aplay --channels=1 --rate=8000 --format=S16_BE --device="hw:Loopback,1,4" $FILE
 rm $FILE

fi </syntaxhighlight>

Cron

# Play newsletter1 every Sat at 16:00 UTC
00 16 * * 7 master /opt/NewsLetters/newsletter1