Merge pull request #1288 from freddanastrom/feature/set-device-hostname

Add feature to set a custom device hostname

Author: dalathegreat

Software/USER_SETTINGS.h

@@ -119,6 +119,8 @@
 /* Connectivity options */
 #define WIFI
 //#define WIFICONFIG  //Enable this line to set a static IP address / gateway /subnet mask for the device. see USER_SETTINGS.cpp for the settings
+//#define CUSTOM_HOSTNAME \
+  "battery-emulator"  //Enable this line to use a custom hostname for the device, if disabled the default naming format 'esp32-XXXXXX' will be used.
 #define WEBSERVER  //Enable this line to enable WiFi, and to run the webserver. See USER_SETTINGS.cpp for the Wifi settings.
 #define WIFIAP  //When enabled, the emulator will broadcast its own access point Wifi. Can be used at the same time as a normal Wifi connection to a router.
 #define MDNSRESPONDER  //Enable this line to enable MDNS, allows battery monitor te be found by .local address. Requires WEBSERVER to be enabled.

Software/src/devboard/webserver/webserver.cpp

@@ -1008,6 +1008,7 @@ String processor(const String& var) {
     }
     content += "</h4>";
     if (status == WL_CONNECTED) {
+      content += "<h4>Hostname: " + String(WiFi.getHostname()) + "</h4>";
       content += "<h4>IP: " + WiFi.localIP().toString() + "</h4>";
     } else {
       content += "<h4>Wifi state: " + getConnectResultString(status) + "</h4>";

Software/src/devboard/wifi/wifi.cpp

@@ -28,6 +28,10 @@ static bool connected_once = false;
 
 void init_WiFi() {
 
+#ifdef CUSTOM_HOSTNAME
+  WiFi.setHostname(CUSTOM_HOSTNAME);  // Set custom hostname if defined in USER_SETTINGS.h
+#endif
+
 #ifdef WIFIAP
   WiFi.mode(WIFI_AP_STA);  // Simultaneous WiFi AP and Router connection
   init_WiFi_AP();
@@ -182,6 +186,9 @@ void init_mDNS() {
   // e.g batteryemulator8C.local where the mac address is 08:F9:E0:D1:06:8C
   String mac = WiFi.macAddress();
   String mdnsHost = "batteryemulator" + mac.substring(mac.length() - 2);
+#ifdef CUSTOM_HOSTNAME  // If CUSTOM_HOSTNAME is defined, use the same hostname also for mDNS
+  mdnsHost = CUSTOM_HOSTNAME;
+#endif
 
   // Initialize mDNS .local resolution
   if (!MDNS.begin(mdnsHost)) {
@@ -190,7 +197,7 @@ void init_mDNS() {
 #endif
   } else {
     // Advertise via bonjour the service so we can auto discover these battery emulators on the local network.
-    MDNS.addService("battery_emulator", "tcp", 80);
+    MDNS.addService(mdnsHost, "tcp", 80);
   }
 }
 #endif  // MDNSRESPONDER