Reserved Ports

🚧 Developers
1

Is there anywhere a list of TCP/UDP ports that are reserved for use by Hubitat and should not be used by developers???

2

I am curious... Just how would a developer create an App or Driver that could listen on a port? I am pretty sure Hubitat does not really allow that, unless something has changed?

I know the hub listens on ports 80, 8080, 8081, and 39501. There may be a few others, but I am not sure.

3

If you send out a UDP packet on a port, HE can listen for a reply on that same port.

If a packet hits a pocket on a socket on a port, 
and the bus is interrupted at a very last resort, 
and the access of the memory makes your floppy disk abort, 
then the socket packet pocket has an error to report.
4

Outgoing ports are typically auto-assigned by the operating system, which chooses an unused port.

5

Here's what I have...

private read() {
  byte[] rawBytes = [0xF1, 0x00, 0x00, 0xA4]
  String stringBytes = hubitat.helper.HexUtils.byteArrayToHexString(rawBytes)
  def myHubAction = new hubitat.device.HubAction(
        stringBytes,
        hubitat.device.Protocol.LAN,
        [
             type              : hubitat.device.HubAction.Type.LAN_TYPE_UDPCLIENT,
             destinationAddress: "192.168.199.59:1337",
             encoding          : hubitat.device.HubAction.Encoding.HEX_STRING,
             ignoreResponse    : false,
             parseWarning      : true,
             timeout           : 10,
		     callback          : parseUDP
        ]
  )
  sendHubCommand(myHubAction)    
}

def parseUDP(message) {  
  log.debug "Got something to parseUDP"
  log.debug "UDP Response -> ${message}"    
}

I'm expecting to get a response back in on port 1337 - and I get nothing. I'm trying to track down what's happening and I then thought - "What if 1337 is being used internally by HE?"

6

Why?

That’s the udp port at the destination address. Not the outgoing port used on the HE to connect to that destination port.

2 Likes
7

Will the response not come back to 1337??? Or it comes back to the outgoing port???

8

This.

2 Likes