title: SNMP custom made device ESP8266
body: <p>my company uses the application PRTG from paessler.com to monitor several SNMP sensors, I need to monitor the voltage of some devices and transmit it to the manager.</p>
  
  <p>I was going to use an ESP8266 programmed via arduino to do it.
  So far I've been able to send data to the ESP via UDP, and I configured it in the manager so it can retrieve the information from it and ping it.</p>
  
  <p>The ping tests are successful however the monitoring does not work, by using the serial interface I can see that the ESP is receiving the data from the manager, with the OID that was set up. But the monitor shows it as inactive, I set up the ESP to send a simple string in the response. </p>
  
  <p>When using a program called Packet Sender I am able to send the udp packets and receive the response as well, and everything works fine.</p>
  
  <p>The ports I am using is 161 to receive in the ESP and I made it send to the 161, 123, 1023 as i saw specified in the prtg site</p>
  
  <p>I may be sending the packets trough a port that is not the right one, or maybe I have to put a header before the message so the controller can Interpret it. I am not sure what the error can be. Any help will be apreciated</p>