eliminates error messages when using Ethernet Static IP

Author: SuGlider

libraries/WiFi/src/ETH.cpp

@@ -385,8 +385,16 @@ bool ETHClass::config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, I
         info.gw.addr = 0;
         info.netmask.addr = 0;
 	}
+    
+    // avoid error messages or failure while DHCP still did not get stopped
+    uint8_t tries = 5;
+    do {
+      const TickType_t xDelay = 50 / portTICK_PERIOD_MS;
+      vTaskDelay( xDelay );
+      err = tcpip_adapter_dhcpc_stop(TCPIP_ADAPTER_IF_ETH);
+      tries--;
+    } while (tries && err != ESP_ERR_TCPIP_ADAPTER_DHCP_ALREADY_STOPPED);
 
-    err = tcpip_adapter_dhcpc_stop(TCPIP_ADAPTER_IF_ETH);
     if(err != ESP_OK && err != ESP_ERR_TCPIP_ADAPTER_DHCP_ALREADY_STOPPED){
         log_e("DHCP could not be stopped! Error: %d", err);
         return false;
@@ -396,7 +404,8 @@ bool ETHClass::config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, I
     if(err != ERR_OK){
         log_e("STA IP could not be configured! Error: %d", err);
         return false;
-}
+    }
+    
     if(info.ip.addr){
         staticIP = true;
     } else {