Add MDNS support.

Author: nseidle

Firmware/RTK_Surveyor/Form.ino

@@ -17,6 +17,14 @@ void startWebServer(bool startWiFi, int httpPort)
     if (wifiStartAP() == false) //Exits calling wifiConnect()
       return;
 
+  if (settings.mdnsEnable == true)
+  {
+    if (MDNS.begin("rtk") == false) //This should make the module findable from 'rtk.local' in browser
+      log_d("Error setting up MDNS responder!");
+    else
+      MDNS.addService("http", "tcp", 80); //Add service to MDNS-SD
+  }
+
   incomingSettings = (char*)malloc(AP_CONFIG_SETTING_SIZE);
   memset(incomingSettings, 0, AP_CONFIG_SETTING_SIZE);
 
@@ -836,6 +844,8 @@ void createSettingsString(char* newSettings)
   else
     stringRecord(newSettings, "minCNO", settings.minCNO_F9P);
 
+  stringRecord(newSettings, "mdnsEnable", settings.mdnsEnable);
+
   //Add ECEF and Geodetic station data to the end of settings
   for (int index = 0; index < COMMON_COORDINATES_MAX_STATIONS ; index++) //Arbitrary 50 station limit
   {
@@ -1237,6 +1247,8 @@ void updateSettingWithValue(const char *settingName, const char* settingValueStr
     for (int i = strlen(settingValueStr); i < 5; i++)
       settings.ntpReferenceId[i] = 0;
   }
+  else if (strcmp(settingName, "mdnsEnable") == 0)
+    settings.mdnsEnable = settingValueBool;
 
   //Unused variables - read to avoid errors
   else if (strcmp(settingName, "measurementRateSec") == 0) {}

Firmware/RTK_Surveyor/NVM.ino

@@ -401,6 +401,9 @@ void recordSystemSettingsToFile(File * settingsFile)
     settingsFile->printf("%s=%d\r\n", "ntpRootDispersion", settings.ntpRootDispersion);
     settingsFile->printf("%s=%s\r\n", "ntpReferenceId", settings.ntpReferenceId);
   }
+
+  settingsFile->printf("%s=%d\r\n", "mdnsEnable", settings.mdnsEnable);
+
 }
 
 //Given a fileName, parse the file and load the given settings struct
@@ -1229,6 +1232,8 @@ bool parseLine(char* str, Settings *settings)
       settings->updateZEDSettings = true;
     }
   }
+  else if (strcmp(settingName, "mdnsEnable") == 0)
+      settings->mdnsEnable = d;
 
   //Check for bulk settings (WiFi credentials, constellations, message rates, ESPNOW Peers)
   //Must be last on else list

Firmware/RTK_Surveyor/RTK_Surveyor.ino

@@ -191,6 +191,7 @@ char logFileName[sizeof("SFE_Facet_L-Band_230101_120101.ubx_plusExtraSpace")] =
 #include <WiFiClientSecure.h> //Built-in.
 #include <PubSubClient.h> //http://librarymanager/All#PubSubClient_MQTT_Lightweight by Nick O'Leary v2.8.0 Used for MQTT obtaining of keys
 #include "ESP32OTAPull.h" //http://librarymanager/All#ESP-OTA-Pull Used for getting latest firmware OTA
+#include <ESPmDNS.h> //Built-in.
 
 #include "esp_wifi.h" //Needed for esp_wifi_set_protocol()
 

Firmware/RTK_Surveyor/WiFi.ino

@@ -336,11 +336,13 @@ void wifiStop()
     systemPrintln("TCP Server offline");
   }
 
+  if (settings.mdnsEnable == true)
+    MDNS.end();
+
   wifiSetState(WIFI_OFF);
 
   wifiConnectionAttempts = 0; //Reset the timeout
 
-
   //If ESP-Now is active, change protocol to only Long Range and re-start WiFi
   if (espnowState > ESPNOW_OFF)
   {
@@ -435,6 +437,17 @@ bool wifiConnect(unsigned long timeout)
   int wifiResponse = wifiMulti.run(timeout);
   if (wifiResponse == WL_CONNECTED)
   {
+    if (settings.enableTcpClient == true || settings.enableTcpServer == true)
+    {
+      if (settings.mdnsEnable == true)
+      {
+        if (MDNS.begin("rtk") == false) //This should make the module findable from 'rtk.local' in browser
+          log_d("Error setting up MDNS responder!");
+        else
+          MDNS.addService("http", "tcp", settings.wifiTcpPort); //Add service to MDNS
+      }
+    }
+
     systemPrintln();
     return true;
   }

Firmware/RTK_Surveyor/menuSystem.ino

@@ -409,6 +409,9 @@ void menuWiFi()
     if (settings.enableTcpServer == true || settings.enableTcpClient == true)
       systemPrintf("p) WiFi TCP Port: %ld\r\n", settings.wifiTcpPort);
 
+    systemPrint("m) MDNS: ");
+    systemPrintf("%s\r\n", settings.mdnsEnable ? "Enabled" : "Disabled");
+
     systemPrintln("x) Exit");
 
     byte incoming = getCharacterNumber();
@@ -473,6 +476,10 @@ void menuWiFi()
         }
       }
     }
+    else if (incoming == 'm')
+    {
+      settings.mdnsEnable ^= 1;
+    }
     else if (incoming == 'x')
       break;
     else if (incoming == INPUT_RESPONSE_GETCHARACTERNUMBER_EMPTY)

Firmware/RTK_Surveyor/settings.h

@@ -841,6 +841,7 @@ typedef struct {
   uint16_t lbandFixTimeout_seconds = 180; //Number of seconds of no L-Band fix before resetting ZED
   int16_t minCNO_F9P = 6; //Minimum satellite signal level for navigation. ZED-F9P default is 6 dBHz
   int16_t minCNO_F9R = 20; //Minimum satellite signal level for navigation. ZED-F9R default is 20 dBHz
+  bool mdnsEnable = false; //Allows locating of device from browser address 'rtk.local'
 } Settings;
 Settings settings;
 const Settings defaultSettings = Settings();