migrate to null safety

[viplifes]

I have updated all project files to support null safety.
This merge still needs to be checked and tested for errors.
But the project is already started and running.

[cloudwebrtc]

Hey @viplifes, thanks a lot, It's really great 👍 . can you resolve the conflict? It seems to be caused by a different fork.
Then I can fully test it.

[viplifes]

Conflicts have been resolved.

[AlvaroVasconcelos]

@viplifes bug on hangup

[viplifes]

Thanks, fixed. You can upgrade and try again.

[AlvaroVasconcelos]

Solved, thank you!

[jongerenchaos]

@viplifes on the registering proces with the demo app (account tab) i get the error:

I/flutter (15018): [2022-02-02 15:18:30.675] Level.error event_manager.dart:110 ::: type 'Null' is not a subtype of type 'bool'
I/flutter (15018): #0 new Challenge.fromMap (package:sip_ua/src/digest_authentication.dart:10:27)
I/flutter (15018): #1 RequestSender._receiveResponse (package:sip_ua/src/request_sender.dart:122:23)
I/flutter (15018): #2 RequestSender.send. (package:sip_ua/src/request_sender.dart:57:7)
I/flutter (15018): #3 EventManager.emit. (package:sip_ua/src/event_manager/event_manager.dart:108:17)
I/flutter (15018): #4 List.forEach (dart:core-patch/growable_array.dart:433:8)
I/flutter (15018): #5 EventManager.emit (package:sip_ua/src/event_manager/event_manager.dart:105:12)
I/flutter (15018): #6 NonInviteClientTransaction.receiveResponse (package:sip_ua/src/transactions/non_invite_client.dart:96:28)
I/flutter (15018): #7 UA.onTransportData (package:sip_ua/src/ua.dart:882:25)
I/flutter (15018): #8 Transport._onData (package:sip_ua/src/transport.dart:316:11)
I/flutter (15018): #9 WebSocketInterface._onMessage (package:sip_ua/src/transports/websocket_interface.dart:172:16)
I/flutter (15018): #10 WebSocketInterface.connect. (package:sip_ua/src/transports/websocket_interface.dart:92:9)
I/flutter (15018): #11 WebSocketImpl.co

This stops the whole registering proces. With the non null-safety version i get a successful registration:

I/flutter ( 8017): [2022-02-01 11:54:30.796] Level.debug digest_authentication.dart:178 ::: authenticate() | using qop=auth [a2:REGISTER:sip:weburl.nl]
I/flutter ( 8017): [2022-02-01 11:54:30.801] Level.debug digest_authentication.dart:205 ::: authenticate() | response generated
I/flutter ( 8017): [2022-02-01 11:54:30.808] Level.debug transport.dart:168 ::: send()
I/flutter ( 8017): [2022-02-01 11:54:30.812] Level.debug websocket_interface.dart:131 ::: send()
I/flutter ( 8017): [2022-02-01 11:54:30.815] Level.debug websocket_dart_impl.dart:49 ::: send:

and after some seconds a registration succes:
I/flutter ( 8017): [2022-02-01 11:54:31.291] Level.debug sip_ua_helper.dart:144 ::: registered => Code: [200], Cause: registered, Reason: OK
I/flutter ( 8017): [2022-02-01 11:54:34.84] Level.debug websocket_interface.dart:169 ::: Received WebSocket message
I/flutter ( 8017): [2022-02-01 11:54:34.87] Level.debug websocket_interface.dart:174 ::: Received and ignored empty packet

How can we resolve this failure?

[cloudwebrtc]

@jongerenchaos Is there any way to reproduce this error? I guess it's a typical issue, I'll be merging this PR within the next week, but before that, I need to do a full test so that the merge will work, it's a big PR after all.

[jongerenchaos]

Yeps here are the steps that i try to do:

First i downloaded the full null safety source from and use the demo application:
https://github.com/viplifes/dart-sip-ua
I compile the android version and after starting the application i put some information in the account tab (with asterisk server information).

The first registration failed (same error as on the topic #132 ) and after this invalid registration i get the error above.

In the demo app without the null safety option the application will try to register again by himself and that registration is okey. I can make and receive calls.Without any reconfigurations on the asterisk application.
But with this new safety version it won't register again and i think the process stops.

[cloudwebrtc]

@jongerenchaos I fixed this and you can test it out, so we can move this PR forward.

[jongerenchaos]

Tnx! It works without any problem!