Add list of text message packet IDs, and check for dupes (#9180)

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/modules/TextMessageModule.cpp

@@ -17,6 +17,9 @@ ProcessMessage TextMessageModule::handleReceived(const meshtastic_MeshPacket &mp
     auto &p = mp.decoded;
     LOG_INFO("Received text msg from=0x%0x, id=0x%x, msg=%.*s", mp.from, mp.id, p.payload.size, p.payload.bytes);
 #endif
+    // add packet ID to the rolling list of packets
+    textPacketList[textPacketListIndex] = mp.id;
+    textPacketListIndex = (textPacketListIndex + 1) % TEXT_PACKET_LIST_SIZE;
 
     // We only store/display messages destined for us.
     devicestate.rx_text_message = mp;
@@ -47,3 +50,13 @@ bool TextMessageModule::wantPacket(const meshtastic_MeshPacket *p)
 {
     return MeshService::isTextPayload(p);
 }
+
+bool TextMessageModule::recentlySeen(uint32_t id)
+{
+    for (size_t i = 0; i < TEXT_PACKET_LIST_SIZE; i++) {
+        if (textPacketList[i] != 0 && textPacketList[i] == id) {
+            return true;
+        }
+    }
+    return false;
+}