B4J Question Program fails when try to connect to MQTT broker in standalone package

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EvgenyB4A

Active Member
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The PC with Windows 10
The B4J version 9.00 and 9.10
I have a program that connects to MQTT broker. It works fine in Debug and Release mode.
But after building Standalone package the program fails with followings:

connector._connectto (java line: -1)
java.lang.IllegalArgumentException: no NetworkModule installed for scheme "tcp" of URI "tcp://broker.hivemq.com:1883"
at b4j/org.eclipse.paho.client.mqttv3.internal.NetworkModuleService.validateURI(Unknown Source)
at b4j/org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(Unknown Source)
at b4j/org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(Unknown Source)
at b4j/org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(Unknown Source)
at b4j/org.eclipse.paho.client.mqttv3.MqttAsyncClient.<init>(Unknown Source)
at b4j/anywheresoftware.b4j.objects.MqttAsyncClientWrapper.Initialize(Unknown Source)
at b4j/b4j.example.connector._connectto(Unknown Source)
at b4j/b4j.example.main._btnconnect_click(Unknown Source)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at b4j/anywheresoftware.b4a.BA.raiseEvent2(Unknown Source)
at b4j/anywheresoftware.b4a.BA$1.run(Unknown Source)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(Unknown Source)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(Unknown Source)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)

What is the problem?
 
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EnriqueGonzalez

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Longtime User
My guess is that you maybe trying to connect with web sockets protocol instead of the tcp protocol, thus failing as your url should be ws:, or it could be also that your broker is expecting ssl: instead of tcp:

Why this happens on standalone package, is hard to know without looking at the code
 
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EvgenyB4A

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No. I connect to tcp://broker.hivemq.com:1883 and everything works in Debug and Release mode.
I think something wrong in Build and standalone package or B4J last versions.
 
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Erel

B4X founder
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EvgenyB4A said:
I think something wrong in Build and standalone package or B4J last versions.
Click to expand...
No. No. No.
Have you followed the instructions?

jMQTT - Official MQTT client

Implementation of MQTT client based on the Paho open source project: http://www.eclipse.org/paho/ See this tutorial for more information: https://www.b4x.com/android/forum/threads/iot-mqtt-protocol.59471/ jMQTT.zip holds the older version, which is compatible with B4A. B4J_Only_jMQTT.zip -...
www.b4x.com
 
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EvgenyB4A

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Longtime User
The problem has been solved by adding the #Packager property. Thank you very much.
It was strange that in previous versions the standalone program worked without adding the property.
 
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