eliminates error messages when using Ethernet Static IP

Author: SuGlider

libraries/Ethernet/src/ETH.cpp

@@ -386,13 +386,10 @@ bool ETHClass::config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, I
         info.netmask.addr = 0;
 	}
 
-    // avoid error messages or failure while DHCP still did not get stopped
-    uint8_t tries = 5;
-    do {
-      delay(50);
-      err = tcpip_adapter_dhcpc_stop(TCPIP_ADAPTER_IF_ETH);
-      tries--;
-    } while (tries && err != ESP_ERR_TCPIP_ADAPTER_DHCP_ALREADY_STOPPED);
+    // this delay forces changing FreeRTOS task context
+    // it avoids DHCP error messages by running DHCP LwIP Events correctly before setting static IP
+    delay(50);
+    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);