GPSD_DEBUG env var (#106)

README.md

@@ -801,6 +801,8 @@ This will:
 - configure the ultrafeeder docker container to read GPSD data
 - configure the ultrafeeder container so the hostname `host.docker.internal` always resolves to the IP address of the underlying machine (where `gpsd` is running)
 
+If you have any issues, readsb will use verbose output if you add the `GPSD_DEBUG=true` as an environment variable.
+
 ### Optional parameters regulating the restart of `mlat-client` when the location changes
 
 The following parameters are all optional and are subject to change. You don't need to set them unless you want to change the default behavior:

rootfs/etc/s6-overlay/scripts/readsb

@@ -139,6 +139,10 @@ if [ -n "${READSB_DEBUG}" ]; then
     READSB_CMD+=("--debug=$READSB_DEBUG")
 fi
 
+if chk_enabled "$GPSD_DEBUG"; then
+    READSB_CMD+=("--devel=debugGPS")
+fi
+
 # Handle --write-state-only-on-exit
 if chk_enabled "${READSB_WRITE_STATE_ONLY_ON_EXIT}"; then
     READSB_CMD+=("--write-state-only-on-exit")