date update

src/LoRa_APRS_iGate.cpp

@@ -68,7 +68,7 @@ ___________________________________________________________________*/
 #endif
 
 
-String              versionDate             = "2026-09-28";
+String              versionDate             = "2026-09-30";
 String              versionNumber           = "4.0.1";
 Configuration       Config;
 WiFiClient          aprsIsClient;

src/gps_utils.cpp

@@ -18,6 +18,7 @@
 
 #include <APRSPacketLib.h>
 #include <TinyGPS++.h>
+#include <SPIFFS.h>
 #include <WiFi.h>
 #include "configuration.h"
 #include "board_pinout.h"
@@ -31,6 +32,10 @@
     #define GPS_BAUD    9600
 #endif
 
+#define GPS_BAUD_FILE           "/gps_baud.dat"
+#define GPS_BAUD_PROBE_TIME_MS  1500
+const uint32_t gpsBaudRates[] = {9600, 115200, 38400, 4800, 57600};     // most common first
+
 extern Configuration    Config;
 extern HardwareSerial   gpsSerial;
 extern TinyGPSPlus      gps;
@@ -40,6 +45,76 @@ String                  distance, iGateBeaconPacket, iGateLoRaBeaconPacket;
 
 namespace GPS_Utils {
 
+#ifdef HAS_GPS
+    bool isKnownBaudRate(uint32_t baud) {
+        if (baud == GPS_BAUD) return true;
+        for (uint32_t knownBaud : gpsBaudRates) {
+            if (knownBaud == baud) return true;
+        }
+        return false;
+    }
+
+    uint32_t readSavedBaudRate() {
+        File file = SPIFFS.open(GPS_BAUD_FILE, "r");
+        if (!file) return 0;
+        uint32_t baud = file.readString().toInt();
+        file.close();
+        return isKnownBaudRate(baud) ? baud : 0;
+    }
+
+    void saveBaudRate(uint32_t baud) {
+        File file = SPIFFS.open(GPS_BAUD_FILE, "w");
+        if (!file) {
+            Utils::println("GPS: could not save baud rate");
+            return;
+        }
+        file.print(baud);
+        file.close();
+    }
+
+    bool probeBaudRate(uint32_t baud) {
+        gpsSerial.end();
+        delay(50);
+        gpsSerial.begin(baud, SERIAL_8N1, GPS_TX, GPS_RX);
+        uint32_t validSentences = gps.passedChecksum();
+        uint32_t probeStart     = millis();
+        while (millis() - probeStart < GPS_BAUD_PROBE_TIME_MS) {
+            while (gpsSerial.available() > 0) gps.encode(gpsSerial.read());
+            if (gps.passedChecksum() > validSentences) return true;   // NMEA with valid checksum
+            delay(10);
+        }
+        return false;
+    }
+
+    uint32_t detectBaudRate() {
+        uint32_t savedBaud = readSavedBaudRate();
+
+        uint32_t candidates[2 + sizeof(gpsBaudRates) / sizeof(gpsBaudRates[0])];
+        size_t   count = 0;
+        auto addCandidate = [&](uint32_t baud) {
+            if (baud == 0) return;
+            for (size_t i = 0; i < count; i++) {
+                if (candidates[i] == baud) return;
+            }
+            candidates[count++] = baud;
+        };
+        addCandidate(savedBaud);                                // saved first, then board default, then common ones
+        addCandidate(GPS_BAUD);
+        for (uint32_t baud : gpsBaudRates) addCandidate(baud);
+
+        for (size_t i = 0; i < count; i++) {
+            if (i == 1) displayShow("GPS", "Searching", "baud rate...", "", 0);
+            bool found = probeBaudRate(candidates[i]);
+            if (!found && i == 0) found = probeBaudRate(candidates[i]);    // retry first one: GPS may be slow to start
+            if (found) {
+                if (candidates[i] != savedBaud) saveBaudRate(candidates[i]);
+                return candidates[i];
+            }
+        }
+        return 0;
+    }
+#endif
+
     String getiGateLoRaBeaconPacket() {
         return iGateLoRaBeaconPacket;
     }
@@ -104,7 +179,15 @@ namespace GPS_Utils {
     void setup() {
         #ifdef HAS_GPS
             if (Config.beacon.gpsActive && Config.digi.ecoMode != 1) {
-                gpsSerial.begin(GPS_BAUD, SERIAL_8N1, GPS_TX, GPS_RX);
+                uint32_t detectedBaud = detectBaudRate();
+                if (detectedBaud != 0) {
+                    Utils::println("GPS: baud rate detected: " + String(detectedBaud));
+                } else {
+                    Utils::println("GPS: no NMEA data found, using default baud rate: " + String(GPS_BAUD));
+                    gpsSerial.end();
+                    delay(50);
+                    gpsSerial.begin(GPS_BAUD, SERIAL_8N1, GPS_TX, GPS_RX);
+                }
             }
         #endif
         generateBeacons();

src/lora_utils.cpp

@@ -41,6 +41,8 @@ bool transmitFlag       = true;
 
 #define DIFS_SLOTS      2       // Number of secuential CAD slots to consider a free channel to Tx
 int  backoffMax         = 4;    // Max Backoff value (number of CAD slots to wait before Tx)
+#define CAD_MAX_WAIT_MS 10000   // Max total time waiting for a free channel, then the packet is dropped
+unsigned long cadStartTime = 0;
 
 #ifdef HAS_SX1262
     SX1262 radio = new Module(RADIO_CS_PIN, RADIO_DIO1_PIN, RADIO_RST_PIN, RADIO_BUSY_PIN);
@@ -195,8 +197,13 @@ namespace LoRa_Utils {
         return true;
     }
 
+    bool cadTimedOut() {
+        return millis() - cadStartTime > CAD_MAX_WAIT_MS;
+    }
+
     void waitForDIFS() {
         while (!doDIFS()) {
+            if (cadTimedOut()) return;
             Serial.println("CAD/DIFS failed, retry...");
         }
     }
@@ -204,6 +211,7 @@ namespace LoRa_Utils {
     void doBEB() {
         int backoffCounter = random(1, backoffMax + 1);
         while (backoffCounter > 0) {
+            if (cadTimedOut()) return;
             if (doCAD()) {
                 waitForDIFS();  // busy channel: freeze backoff and restart DIFS
             } else {
@@ -225,22 +233,30 @@ namespace LoRa_Utils {
             if (Config.digi.ecoMode != 1) digitalWrite(INTERNAL_LED_PIN, HIGH);     // disabled in Ultra Eco Mode
         #endif
 
+        bool cadDropped = false;
         if (Config.loramodule.cadActive) {
+            cadStartTime = millis();
             waitForDIFS();  // DIFS (Distributed Inter-Frame Space)
             doBEB();        // BEB  (Binary Exponential Backoff)
+            if (cadTimedOut()) {
+                Utils::println("CAD timeout, packet dropped: " + newPacket);
+                cadDropped = true;
+            }
         }
 
-        int state = radio.transmit("\x3c\xff\x01" + newPacket);
-        transmitFlag = true;
-        if (state == RADIOLIB_ERR_NONE) {
-            if (Config.syslog.active && networkManager->isConnected()) {
-                SYSLOG_Utils::logLoRaTx(newPacket);
+        if (!cadDropped) {
+            int state = radio.transmit("\x3c\xff\x01" + newPacket);
+            transmitFlag = true;
+            if (state == RADIOLIB_ERR_NONE) {
+                if (Config.syslog.active && networkManager->isConnected()) {
+                    SYSLOG_Utils::logLoRaTx(newPacket);
+                }
+                Utils::print("---> LoRa Packet Tx : ");
+                Utils::println(newPacket);
+            } else {
+                Utils::print(F("failed, code "));
+                Utils::println(String(state));
             }
-            Utils::print("---> LoRa Packet Tx : ");
-            Utils::println(newPacket);
-        } else {
-            Utils::print(F("failed, code "));
-            Utils::println(String(state));
         }
         #ifdef INTERNAL_LED_PIN
             if (Config.digi.ecoMode != 1) digitalWrite(INTERNAL_LED_PIN, LOW);      // disabled in Ultra Eco Mode
@@ -250,6 +266,7 @@ namespace LoRa_Utils {
                 changeFreqRx();
             }
         }
+        if (cadDropped) radio.startReceive();   // no Tx end IRQ will restart Rx
     }
 
     String receivePacketFromSleep() {

variants/ESP32C3_SuperMini_DIY_LoRa_SX1278/board_pinout.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Ricardo Guzman - CA2RXU
+/* Copyright (C) 2026 Ricardo Guzman - CA2RXU
  *
  * This file is part of LoRa APRS iGate.
  *

variants/RAK3112/board_pinout.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Ricardo Guzman - CA2RXU
+/* Copyright (C) 2026 Ricardo Guzman - CA2RXU
  *
  * This file is part of LoRa APRS iGate.
  *

variants/RAK3312/board_pinout.h

@@ -1,4 +1,4 @@
-/* Copyright (C) 2025 Ricardo Guzman - CA2RXU
+/* Copyright (C) 2026 Ricardo Guzman - CA2RXU
  *
  * This file is part of LoRa APRS iGate.
  *

variants/ttgo-t-beam-v1_SX1268/board_pinout.h

@@ -21,6 +21,7 @@
 
     //  LoRa Radio
     #define HAS_SX1268
+    #define HAS_TCXO
     #define RADIO_SCLK_PIN          5
     #define RADIO_MISO_PIN          19
     #define RADIO_MOSI_PIN          27