The problem using client.println("GET /"+UploadData+" HTTP/1.1\r\nConnection: close\r\n\r\n");

[maxgerhardt]

@meathome2017

		if (client.connect(ServerHost1,80)){
			client.println("GET /"+UploadData+" HTTP/1.1\r\nConnection: close\r\n\r\n");
      client.println("Host: "+String("192.168.1.210"));
      delay(500); // Essential delay for ESP32 
      client.println F("Connection: close");
			Serial.println F("Connection: close"); 
      client.stop();
		}  

This is not in the correct format for a HTTP request.

1. The GET URL does not contain the the host.
2. After you do a Conection: clone\r\n\r\n you try to send more HTTP headers (Host:), but with the double \r\n you’ve already closed ended the HTTP request
3. After that there’s invalid C++ code client.println F("Connection: close"); should not compile since there are missing ( ) around the argument.

The request should look like e.g.

GET /slider1?value=100 HTTP/1.1
Host: 192.168.1.210
Connection: close

Try and adapt the code for that.