TiddlyServer on Raspberry Pi 3 with Stretch Raspbian and host 0.0.0.0

[Ron Sharp]

I ran into a snag following instructions for installing TiddlyServer on a Pi:

https://www.didaxy.com/tiddlyserver-on-the-raspberry-pi

Running for localhost works fine, but trying put it on the LAN generates an EADDRINUSE exception, no matter which port is used, which was a head-scratcher because a single Tiddlywiki server works fine.

The problem is probably that Raspbian Stretch changed a lot of networking behavior, and node.js is in fast-moving state of flux. (v8.9.1)

Stretch generates interfaces for lo, eth0 and wlan0, even if the wifi isn't being used.
Listening for host 0.0.0.0 tries all the interfaces, and goes boom.

The solution/workaround is to use the exact IP address of the correct interface. (I've assigned fixed IP addresses on the LAN, so that isn't a problem for me.) It's working fine now, thanks!

{ Error: listen EADDRINUSE 0.0.0.0:8888
    at Object._errnoException (util.js:1024:11)
    at _exceptionWithHostPort (util.js:1046:20)
    at Server.setupListenHandle [as _listen2] (net.js:1351:14)
    at listenInCluster (net.js:1392:12)
    at doListen (net.js:1501:7)
    at _combinedTickCallback (internal/process/next_tick.js:141:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)
    at Function.Module.runMain (module.js:678:11)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3
  code: 'EADDRINUSE',
  errno: 'EADDRINUSE',
  syscall: 'listen',
  address: '0.0.0.0',
  port: 8888 }
caught process uncaughtException

[TonyM]

Ron,

Thanks for keeping the community updated. I suppose this is an example of the system giving you exactly what you asked for (hosting on all IP Addresses) and as a result not working. Asking a more specific question to host it on this address solves the problem.

I have a PCDuino, running Ubuntu but not had the time to play. Have you found a way to use tiddlywiki to interact with the RasperyPi's inputs and outputs? I imaging using tiddlywiki to kick off code on a microcomputer could be very powerful. Or are you simply using the Pi as a server platform?

Regards

Tony

[RichardWilliamSmith]

Thanks Ron, I'll look at updating the docs when I get a chance.

Regards,

Richard

[PMario]

Hi Ron,

Did you try different ports?

-m