Connection cancels on iOS after upgrade to tns 5.X

[Adelrisk]

EDIT: see below for an update of a further investigation. tl;dr: The problem is caused by a number of as-yet-unknown app specific dependencies and/or code, in addition to Nativescript 5.X.

A low-level error is preventing me from upgrading an existing app to Nativescript 5, which causes me to contemplate questions.

After upgrading from Nativescript 4.2 to 5 (and again recently 5.2), everything in the app appears to work as before, except a new behaviour occurs when using the Websockets: they cancel unexpectedly without explanation.

TCP Conn 0x2809af900 canceled
[C2 Hostname#88d08305:443 tcp, legacy-socket] cancel
[C2 Hostname#88d08305:443 tcp, legacy-socket] cancelled
[C2.1 <private> 192.168.178.111:51863<->IPv4#02d701df:443]
Connected Path: satisfied (Path is satisfied), interface: en0, ipv4, ipv6, dns
Duration: 2.064s, DNS @0.001s took 0.002s, TCP @0.004s took 0.034s
bytes in/out: 3931/1022, packets in/out: 8/6, rtt: 0.045s, retransmitted packets: 0, out-of-order packets: 0
0.000s [C2 <private> Hostname#88d08305:443 resolver] path:start
0.000s [C2 <private> Hostname#88d08305:443 resolver] path:satisfied
0.001s [C2 <private> Hostname#88d08305:443 resolver] resolver:start_dns
0.003s [C2 <private> Hostname#88d08305:443 resolver] resolver:receive_dns
0.003s [C2.1 <private> 192.168.178.111:51863<->IPv4#02d701df:443 socket-flow] path:start
0.004s [C2.1 <private> 192.168.178.111:51863<->IPv4#02d701df:443 socket-flow] path:satisfied
0.004s [C2.1 <private> 192.168.178.111:51863<->IPv4#02d701df:443 socket-flow] flow:start_connect
0.037s [C2.1 <private> 192.168.178.111:51863<->IPv4#02d701df:443 socket-flow] flow:finish_connect
0.038s [C2 <private> Hostname#88d08305:443 resolver] flow:finish_connect
0.038s [C2.1 <private> 192.168.178.111:51863<->IPv4#02d701df:443 socket-flow] flow:changed_viability
0.038s [C2 <private> Hostname#88d08305:443 resolver] flow:changed_viability
2.064s [C2] path:cancel
nw_endpoint_flow_protocol_disconnected [C2.1 IPv4#02d701df:443 cancelled socket-flow (null)] Output protocol disconnected
nw_connection_report_state_with_handler_locked [C2] reporting state cancelled

This occurs very consistently and reproducibly, and does not happen when I don't upgrade Nativescript. Any clues how I might make progress on this problem?

UPDATE:

• I upgraded the demo to Nativescript 5.2 and could not reproduce the problem or find any problems. See here for my changes. I guess this is still good news?
• I connected my app to your demo server to eliminate the server as a source of errors. It received the init/hello messages and spontaneously cancelled soon after, so no observable difference.
• the new Nativescript option discardUncaughtJsExceptions didn't catch any errors.
• adding/removing a websocket protocol didn't change the errorful behaviour.

[Adelrisk]

This problem exists for version 1.5.1 and 1.5.3.

Btw, there is no propagation of an error by the Nativescript instance. No callbacks are triggered and no (Javascript) error is reported.

[romandrahan]

@Adelrisk @NathanaelA the same for me 👆

[NathanaelA]

Thank you for reporting the issue. Just to set the expectation; Unfortunately, I have like zero unpaid free time right now to investigate why it is not working at this point. All my "unpaid" time is currently going to several other projects that I am currently trying to finish.

If someone's company wants to sponsor the time to fix this (send me an email) -- or if anyone wants to trace down the issue, I will gladly take PR's. Otherwise it will probably be at least a few weeks before I might have any time to look into this issue.

[legion151]

any news on this? we're now on tns v6.3.3 - and this just happend...

[legion151]

82 kinda solves this by using ios native sockets - which are availabe from ios 13 on.

[NathanaelA]

I basically merged your PR into v2.0, however I did ALSO test PocketSocket on iOS 14.7 and had no issues with NS v8.0