add option to ignore direct messages

src/mqtt.js

@@ -53,6 +53,11 @@ const optionsList = [
         type: Boolean,
         description: "This option will save all received text messages to the database.",
     },
+    {
+        name: "ignore-direct-messages",
+        type: Boolean,
+        description: "This option will prevent saving direct messages to the database.",
+    },
     {
         name: "collect-waypoints",
         type: Boolean,
@@ -164,6 +169,7 @@ const mqttTopics = options["mqtt-topic"] ?? ["msh/#"];
 const collectServiceEnvelopes = options["collect-service-envelopes"] ?? false;
 const collectPositions = options["collect-positions"] ?? true;
 const collectTextMessages = options["collect-text-messages"] ?? false;
+const ignoreDirectMessages = options["ignore-direct-messages"] ?? false;
 const collectWaypoints = options["collect-waypoints"] ?? true;
 const collectNeighbourInfo = options["collect-neighbour-info"] ?? false;
 const collectMapReports = options["collect-map-reports"] ?? true;
@@ -658,6 +664,11 @@ client.on("message", async (topic, message) => {
                 return;
             }
 
+            // check if we want to ignore direct messages
+            if(ignoreDirectMessages && envelope.packet.to !== 0xFFFFFFFF){
+                return;
+            }
+
             if(logKnownPacketTypes) {
                 console.log("TEXT_MESSAGE_APP", {
                     to: envelope.packet.to.toString(16),