Adding telnet for remote debugging purpose

OTAsetup.cpp

@@ -0,0 +1,31 @@
+
+#include "OTAsetup.h"
+
+void initOTA(){
+  // Set hostname and start OTA
+  ArduinoOTA.setHostname("LibreMetric");
+  // Start of OTA
+  ArduinoOTA.onStart([]() {
+    DEBUG_PRINTLN("OTA Beginning!");
+  });
+  // progress of OTA
+  ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
+    DEBUG_PRINTF("progress: %u%%\r", (progress/(total/100)));
+  });
+  // OTA onEnd
+  ArduinoOTA.onEnd([](){
+    DEBUG_PRINTLN("\nOTA ended, let\'s restart");
+  });
+  // OTA error handle
+  ArduinoOTA.onError([](ota_error_t error) {
+    DEBUG_PRINT("ArduinoOTA Error[");
+    DEBUG_PRINT(error);
+    DEBUG_PRINT("]: ");
+    if (error == OTA_AUTH_ERROR) DEBUG_PRINTLN("Auth Failed");
+    else if (error == OTA_BEGIN_ERROR) DEBUG_PRINTLN("Begin Failed");
+    else if (error == OTA_CONNECT_ERROR) DEBUG_PRINTLN("Connect Failed");
+    else if (error == OTA_RECEIVE_ERROR) DEBUG_PRINTLN("Receive Failed");
+    else if (error == OTA_END_ERROR) DEBUG_PRINTLN("End Failed");
+  });
+  ArduinoOTA.begin();
+}