Allow setting the hostname

Allows setting the hostname if MY_ESP6266_HOSTNAME is defined.

libraries/MySensors/core/MyGatewayTransportEthernet.cpp

@@ -103,6 +103,9 @@ bool gatewayTransportInit() {
 		#if defined(MY_ESP8266_SSID)
 			// Turn off access point
 			WiFi.mode (WIFI_STA);
+			#if defined(MY_ESP8266_HOSTNAME)
+				WiFi.hostname(MY_EPS8266_HOSTNAME);
+			#endif
 			(void)WiFi.begin(MY_ESP8266_SSID, MY_ESP8266_PASSWORD);
 			#ifdef MY_IP_ADDRESS
 				WiFi.config(_ethernetGatewayIP, gateway, subnet);

libraries/MySensors/core/MyGatewayTransportMQTTClient.cpp

@@ -167,6 +167,9 @@ bool gatewayTransportInit() {
   	#if defined(MY_GATEWAY_ESP8266)
 		// Turn off access point
 		WiFi.mode (WIFI_STA);
+                #if defined(MY_ESP8266_HOSTNAME)
+                        WiFi.hostname(MY_ESP8266_HOSTNAME);
+                #endif
 		(void)WiFi.begin(MY_ESP8266_SSID, MY_ESP8266_PASSWORD);
 		#ifdef MY_IP_ADDRESS
 			WiFi.config(_clientIp, _gatewayIp, _subnetIp);

libraries/MySensors/examples/GatewayESP8266/GatewayESP8266.ino

@@ -86,6 +86,10 @@
 // Enable UDP communication
 //#define MY_USE_UDP
 
+// Set the hostname for the WiFi Client. This is the hostname
+// it will pass to the DHCP server if not static.
+// #define MY_ESP8266_HOSTNAME "sensor-gateway"
+
 // Enable MY_IP_ADDRESS here if you want a static ip address (no DHCP)
 //#define MY_IP_ADDRESS 192,168,178,87
 

libraries/MySensors/examples/GatewayESP8266MQTTClient/GatewayESP8266MQTTClient.ino

@@ -88,6 +88,10 @@
 #define MY_ESP8266_SSID "MySSID"
 #define MY_ESP8266_PASSWORD "MyVerySecretPassword"
 
+// Set the hostname for the WiFi Client. This is the hostname
+// it will pass to the DHCP server if not static. 
+// #define MY_ESP8266_HOSTNAME "mqtt-sensor-gateway"
+
 // Enable MY_IP_ADDRESS here if you want a static ip address (no DHCP)
 #define MY_IP_ADDRESS 192,168,178,87