replaced string for hash in 25segBuffer

include/station_utils.h

@@ -37,8 +37,7 @@ namespace STATION_Utils {
     void deleteNotHeard();
     void updateLastHeard(const String& station);
     bool wasHeard(const String& station);
-    void clean25SegBuffer();
-    bool check25SegBuffer(const String& station, const String& textMessage);
+    bool isIn25SegHashBuffer(const String& station, const String& textMessage);
     void processOutputPacketBufferUltraEcoMode();
     void processOutputPacketBuffer();
     void addToOutputPacketBuffer(const String& packet, bool flag = false);

src/LoRa_APRS_iGate.cpp

@@ -188,7 +188,6 @@ void loop() {
             }
 
             if (Config.loramodule.txActive && (Config.digi.mode == 2 || Config.digi.mode == 3 || backupDigiMode)) { // If Digi enabled
-                STATION_Utils::clean25SegBuffer();
                 DIGI_Utils::processLoRaPacket(packet); // Send received packet to Digi
             }
 

src/digi_utils.cpp

@@ -149,7 +149,8 @@ namespace DIGI_Utils {
         if (Sender == stationCallsign) return;          // Avoid listening to self packets
         if (!thirdPartyPacket && Config.tacticalCallsign == "" && !Utils::callsignIsValid(Sender)) return;  // No thirdParty + no tactical y no valid callsign
 
-        if (STATION_Utils::check25SegBuffer(Sender, temp.substring(temp.indexOf(":") + 2))) {
+        if (STATION_Utils::isIn25SegHashBuffer(Sender, temp.substring(temp.indexOf(":") + 2))) return;
+
         STATION_Utils::updateLastHeard(Sender);
         Utils::typeOfPacket(temp, 2);               // Digi
         bool queryMessage = false;
@@ -171,6 +172,5 @@ namespace DIGI_Utils {
             lastScreenOn = millis();
         }
     }
-    }
 
 }

src/station_utils.cpp

@@ -45,12 +45,10 @@ std::vector<OutputPacketBuffer> outputPacketBuffer;
 
 struct Packet25SegBuffer {
     uint32_t    receivedTime;
-    String      station;
-    String      payload;
+    uint32_t    hash;
 };
 std::vector<Packet25SegBuffer>  packet25SegBuffer;
 
-
 bool saveNewDigiEcoModeConfig   = false;
 bool packetIsBeacon             = false;
 
@@ -166,18 +164,33 @@ namespace STATION_Utils {
         return false;
     }
 
-    void clean25SegBuffer() {
-        if (!packet25SegBuffer.empty() && (millis() - packet25SegBuffer[0].receivedTime) >  25 * 1000) packet25SegBuffer.erase(packet25SegBuffer.begin());
+    void clean25SegHashBuffer() {
+        uint32_t currentTime = millis();
+        for (int i = packet25SegBuffer.size() - 1; i >= 0; i--) {
+            if ((currentTime - packet25SegBuffer[i].receivedTime) > 25 * 1000) {
+                packet25SegBuffer.erase(packet25SegBuffer.begin() + i);
+            }
+        }
     }
 
-    bool check25SegBuffer(const String& station, const String& textMessage) {
-        if (!packet25SegBuffer.empty()) {
+    uint32_t makeHash(const String& station, const String& payload) {   // DJB2 Hash
+        uint32_t h = 5381;
+        for (size_t i = 0; i < station.length(); i++)
+            h = ((h << 5) + h) + station[i];
+        for (size_t i = 0; i < payload.length(); i++)
+            h = ((h << 5) + h) + payload[i];
+        return h;
+    }
+
+    bool isIn25SegHashBuffer(const String& station, const String& textMessage) {
+        uint32_t newHash = makeHash(station, textMessage);
+        uint32_t currentTime = millis();
+        clean25SegHashBuffer();
         for (int i = 0; i < packet25SegBuffer.size(); i++) {
-                if (packet25SegBuffer[i].station == station && packet25SegBuffer[i].payload == textMessage) return false;
+            if (packet25SegBuffer[i].hash == newHash) return true;
         }
-        }
-        packet25SegBuffer.emplace_back(Packet25SegBuffer{millis(), station, textMessage});
-        return true;
+        packet25SegBuffer.push_back({currentTime, newHash});
+        return false;
     }
 
     void processOutputPacketBufferUltraEcoMode() {