From d3a12fd664e585b68ee2daa93697d05e006f6157 Mon Sep 17 00:00:00 2001
From: thetechprepper <info@thetechprepper.com>
Date: Sun, 28 Jun 2026 12:48:05 -0700
Subject: [PATCH] modem73 - Initial PnP wrapper script for modem73

---
 overlay/opt/emcomm-tools/bin/et-modem73 | 121 ++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100755 overlay/opt/emcomm-tools/bin/et-modem73

diff --git a/overlay/opt/emcomm-tools/bin/et-modem73 b/overlay/opt/emcomm-tools/bin/et-modem73
new file mode 100755
index 0000000..a807094
--- /dev/null
+++ b/overlay/opt/emcomm-tools/bin/et-modem73
@@ -0,0 +1,121 @@
+#!/bin/bash
+#
+# Author  : Gaston Gonzalez
+# Date    : 28 June 2026
+# Purpose : Wrapper script for starting modem73 with PnP support
+#
+# Preconditions:
+# 1. Supported radio and audio interface are connected and properly detected
+#
+# Postconditions:
+# 1. modem73 started with sane defaults
+
+MODEM73_CONF_FILE=${ET_HOME}/conf/template.d/modem73/settings.default
+
+usage() {
+  echo "usage: $(basename $0) <command> <type>"
+  echo "  <command>"
+  echo "    start              - Start modem73 in selected mode"
+  echo "    update-config      - Update configuration for selected mode"
+  echo ""
+  echo "  <type>"
+  echo "    default            - QPSK, normal frames, 1/2 code rate (recommended)"
+}
+
+if [[ $# -ne 2 ]]; then
+  usage
+  exit 1
+fi
+
+MODE=$2
+case "${MODE}" in
+  default)
+    et-log "Configuration updates not yet implemented."
+  ;;
+  *)
+    et-log "Can't started modem73. Mode '${MODE}' not supported"
+    usage
+    exit 1
+  ;;
+esac
+
+notify_user() {
+  notify-send \
+   -t 10000 \
+   --app-name="EmComm Tools" \
+   "$1"
+}
+
+[ -z ${ET_LOG_DIR} ] && ET_LOG_DIR="${HOME}/.local/share/emcomm-tools"
+[ ! -e ${ET_LOG_DIR} ] && mkdir -p ${ET_LOG_DIR}
+
+start() {
+  update_config
+  
+  if [ $? -eq 0 ]; then
+
+    systemctl is-active --quiet rigctld
+    if [ $? -ne 0 ]; then
+      et-log "Can't start modem73. rigctld not running. Ensure radio is selected."
+      notify_user "Can't start modem73. rigctld not running."
+      exit 1
+    fi
+  
+    ALSA_DEVICE=$(et-system-info et-audio-card) 
+    INPUT_AUDIO=$(modem73 --list-audio | grep input | grep $ALSA_DEVICE | cut -d":" -f3)
+    OUTPUT_AUDIO=$(modem73 --list-audio | grep output| grep $ALSA_DEVICE | cut -d":" -f3)
+
+    CMD="modem73 --input-device ${INPUT_AUDIO} --output-device ${OUTPUT_AUDIO} --ptt rigctl --headless"
+    et-log "Starting modem73 with: '${CMD}'"
+    echo
+    ${CMD}
+  else 
+    et-log "Error updating configuration. Can't start modem73"
+    exit 1
+  fi
+}
+
+update_config () {
+
+    et-log "Attempting to start modem73 in mode: '${MODE}'"
+
+    [ -z "$ET_USER_CONFIG" ] && ET_USER_CONFIG="${HOME}/.config/emcomm-tools/user.json"
+
+    CALLSIGN=$(cat ${ET_USER_CONFIG} | jq -r .callsign)
+
+    # 1. Check if the symlink was created by the udev rules
+    if [ -e /dev/et-audio ]; then
+
+       # 2. Check that this device was properly tagged with the ET_AUDIO env variable with a udev rule
+       APLAY_OUT=$(arecord -l | grep ET_AUDIO)
+       if [ $? -eq 0 ]; then
+
+         # Configure ALSA settings for sound card
+         /opt/emcomm-tools/bin/et-audio update-config
+
+       else
+         et-log "No ET_AUDIO device detected."
+         notify_user "Can't start modem73. No ET_AUDIO device detected."
+         exit 1
+       fi
+    else
+      et-log "No ET_AUDIO device plugged in."
+      notify_user "Can't start modem73. No supported audio device plugged in."
+      exit 1
+    fi
+
+}
+
+case $1 in
+  start)
+    start
+    ;;
+  update-config)
+    update_config
+    ;;
+  *)
+    echo "Invalid command."
+    usage
+    exit 1
+  ;;
+esac