client reset observe failed

in client side, i want to send RST packet to server.

req.on('response', function(res) {
  console.log("---------------------response---------------------");
  console.log(res.headers);

  var rcvCount = 5;
  res.on('data', function(data) {
    console.log(data);
    rcvCount--
    if(rcvCount == 0){
      //it will throw new Error: Empty messages must be empty
      req.reset();
    }
  });
})
req.end()

when i call req.reset(), it will throw Empty messages must be empty error

[Pluuuto]

I have almost the same problem. When I am using “res.reset()” at server-end.

const coap = require('coap')

const server = coap.createServer()

server.on('request', (req, res) => {
  console.log(`Receive request: ${req.url}`)
  res.reset()
})

server.listen(5683, '127.0.0.1')

It will cause client-end throwing “Empty messages must be empty error”. Using wireshark to capture and I find server-end sending NON msg with ‘5.00 Internal Server Error’ and body ‘Empty messages must be empty’ after send RST msg.

NON msg has the same token with the NON request which client-end sent. I think this cause client-end throws error. I don’t know why coap source code deal with reset on this way, maybe it’s a bug? (reference to ‘fastseries’ lib)

[JKRhb]

@robertbbb @lucarv Could you give a bit more context under which conditions the error occured? (Sorry for the late follow-up question.)