fx-4cr Initial integration PnP. The TX audio side is still in development, however, received audio and CAT control work.

overlay/etc/udev/rules.d/89-et-bg2fx-fx4cr.rules

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+# Author   : Gaston Gonzalez
+# Date     : 18 September 2025
+# Purpose  : udev rules for the FX-4CR by BG2FX
+#
+# Preconditions:
+# 1. FX-4CR connected via USB cable
+#
+# Postconditions:
+# 1. /dev/et-cat created
+# 2. rigctld is started
+# 3. /dev/et-audio created
+
+SUBSYSTEM=="tty", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", ENV{ET_DEVICE}=="", \
+    ACTION=="add", \
+    ENV{ET_DEVICE}="FX-4CR", ENV{ET_SUBDEVICE}="CAT", GROUP="dialout", MODE="0660", SYMLINK+="et-cat", \
+    RUN+="/usr/bin/systemctl start rigctld"
+
+#    PROGRAM="/opt/emcomm-tools/sbin/udev-tester.sh digirig-mobile", \
+SUBSYSTEM=="sound", ATTRS{idVendor}=="4c4a", ATTRS{idProduct}=="4155", \
+    ACTION=="add", \
+    ENV{ET_DEVICE}="FX-4CR", \
+    ATTR{id}="ET_AUDIO", \
+    ENV{ET_SUBDEVICE}="AUDIO", GROUP="audio", MODE="0660", SYMLINK+="et-audio"

overlay/opt/emcomm-tools/conf/radios.d/bg2fx-fx4cr.json

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+{
+  "id": "bg2fx-fx4cr",
+  "vendor": "BG2FX",
+  "model": "FX-4CR",
+  "rigctrl": {
+    "id": "2031",
+    "baud": "115200",
+    "ptt": "RTS",
+    "pttOnly": "false"
+  },
+  "notes": [
+    "THESE NOTES ARE A WORK IN PROGRESS",
+    "Short press [PWR], then rotate AF knob until POW = 5.0",
+    "Toggle [SSB] button until both USB and DIG appear",
+    "Short press [M. V] until VFOA is displayed",
+    "Set radio volume to 50",
+    "Set mic gain to ?",
+    "Set alsamixer PCM to ?",
+    "Set alsamixer Mic to 50",
+    "Set alsamixer AFC to mm"
+  ],
+  "fieldNotes": [
+  ]
+}