rongix / ros_navigation_command_app Goto Github PK

Hi, I am able to build and compile the app successfully. However, when I refresh the connection by pressing the refresh button, I am getting this error:
[ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: Bad state: No element
#0 Iterable.first (dart:core/iterable.dart:624:7)
#1 RosSubscriber.establishTCPROSConnection. (package:ros_nodes/src/ros_subscriber.dart:124:12)
#2 _rootRunUnary (dart:async/zone.dart:1434:47)
#3 _CustomZone.runUnary (dart:async/zone.dart:1335:19)
#4 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
#5 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#6 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#7 _ForwardingStreamSubscription._add (dart:async/stream_pipe.dart:123:11)
#8 _TakeStream._handleData (dart:async/stream_pipe.dart:305:12)
#9 _ForwardingStreamSubscription._handleData (dart:async/stream_pipe.dart:153:13)
#10 _rootRunUnary (dart:async/zone.dart:1434:47)
#11 _CustomZone.runUnary (dart:async/zone.dart:1335:19)
#12 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
#13 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#14 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#15 _SyncBroadcastStreamController._sendData. (dart:async/broadcast_stream_controller.dart:385:20)
#16 _BroadcastStreamController._forEachListener (dart:async/broadcast_stream_controller.dart:322:15)
#17 _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:384:5)
#18 _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:244:5)
#19 _AsBroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:474:11)
#20 _rootRunUnary (dart:async/zone.dart:1434:47)
#21 _CustomZone.runUnary (dart:async/zone.dart:1335:19)
#22 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
#23 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#24 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#25 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:774:19)
#26 _StreamController._add (dart:async/stream_controller.dart:648:7)
#27 _StreamController.add (dart:async/stream_controller.dart:596:5)
#28 _Socket._onData (dart:io-patch/socket_patch.dart:2314:41)
#29 _rootRunUnary (dart:async/zone.dart:1442:13)
#30 _CustomZone.runUnary (dart:async/zone.dart:1335:19)
#31 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1244:7)
#32 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#33 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:271:7)
#34 _SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:774:19)
#35 _StreamController._add (dart:async/stream_controller.dart:648:7)
#36 _StreamController.add (dart:async/stream_controller.dart:596:5)
#37 new _RawSocket. (dart:io-patch/socket_patch.dart:1839:33)
#38 _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:1322:14)
#39 _microtaskLoop (dart:async/schedule_microtask.dart:40:21)
#40 _startMicrotaskLoop (dart:async/schedule_microtask.dart:49:5)

I am really unable to understand why this is happening, and am not able to fix it. Any help would be greatly appreciated! Thanks a lot!

Hey, I managed to compile the APK and am trying to run it on an android device. I have set the master IP to the ROS_MASTER_URI and the local IP correctly. I'm able to send data on /cmd_vel but am not able to subscribe to any topic (such as camera on the correct topic or the map.

Did I miss any step in setup? Can you help me debug this?

Hey Rongix,
Firstly I greatly appreciate for this project which helped me integrate ROS and Flutter. I just started to learn in depth concepts like Canvas in Flutter, Can you help me add this feature where we can get the Coordinates from rendered map using interactive Viewer which can be used to pass it as a Goal through DartROS publisher. I have tried it but no visible results. Any idea how to add this functionality? Any help will be greatly appreciated.

Thanks,
V