B4J Library MQTT - MQ Telemetry Transport for B4J

This library was made based on MQTT Protocol

Installation instructions:

- Copy the .xml and .jar(s) files to your custom libraries folder
- Select in your REFERENCED LIBRARIES

Version history:
V1.0 (First public release - Donationware):
- Initial version

MQTT
Author: Alberto Iglesias - alberto@visualnet.inf.br
Version: 1.01

• MQTT
  Events:
  • connectionlost ( As )
  • deliverycomplete (Token As String)
  • messageArrived (Topic As String, Message As String)
  • onConnect (Status as boolean As )
  • onDisconnect (Status as boolean As )
  • onInitialized ( As )
  Fields:
  • CleanSession As Boolean
  • KeepAliveInterval As Int
  • QoS_AtLeastOnce As Int
  • QoS_AtMostOnce As Int
  • QoS_ExactlyOnce As Int
  • generatedClientId As String
  Methods:
  • About As String
  • Connect (broker As String, ClientID As String, Username As String, Password As String) As Boolean
  • Disconnect As Boolean
  • Initialize (eventname As String)
  • Publish (Topic As String, Message As String, Qos As Int, Retained As Boolean)
  • Subscribe (Topic As String)
  • Unsubscribe (Topic As String)
  • Version As String
  • isConnected As Boolean

How works the MQTT protocol

Communication Infrastructure

References:
http://mqtt.org/
http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html
Mosquitto Broker: http://mosquitto.org/

* This version is fully functional, the only one difference is when publishing a message the text "Donationware" is delivery with your message.
Please consider a simple €10 donation and I send to you the Library without "Donationware" text in a publish method.

Already available in B4A too:
https://www.b4x.com/android/forum/threads/mqtt-mq-telemetry-transport-for-b4a.48167/

Already available in B4i too:
https://www.b4x.com/android/forum/threads/mqtt-mq-telemetry-transport-for-b4i.50036/





Works on MAC

Works on Windows

 

[Alberto Iglesias]

A Free broker to test with you aplication:

URL: broker.mqtt-dashboard.com
Port: 1883

 

[jiuciyu_2008]

Unable to decompress the library file

 

[alexhi]

Hi,Alberto! I try MQTT Sample for B4J. If I run in IDE work OK. If I run java - jar MqttB4J.jar
objMqtt_messageArrived not work (Library 1.00)

 

[Alberto Iglesias]

I think you have some different in your java configuration maybe...

I try right now the example connecting with my MQTT Server (Broker) and one iPhone, look in this video:

The iPhone is my real iPhone, is not a emulator.

 

[JakeBullet70]

@Alberto Iglesias - Is this library equivalent to the 1.0..5 version for b4a?

 

[Alberto Iglesias]

Yes. Is the same, to use with B4J

and have another ones

For B4i
https://www.b4x.com/android/forum/threads/mqtt-mq-telemetry-transport-for-b4i.50036/

For B4a
https://www.b4x.com/android/forum/threads/mqtt-mq-telemetry-transport-for-b4a.48167/

For B4i
https://www.b4x.com/android/forum/threads/mqtt-mq-telemetry-transport-for-b4j.48184/

 

[JakeBullet70]

@Alberto Iglesias
I just purchased this lib. I see that it is not the same as the b4a lib.can you upgrade this to the same version as b4a?

thanks

 

[Alberto Iglesias]

Hello Jake,

I can´t understand what you mean.. The Libs B4J and B4A are different, is not the same. For example: the MQTT B4A Library use classes that B4J don´t have and vice versa.

 

[JakeBullet70]

Hi Alberto.

None of these features are in the b4j version. Can we get them into the b4j version?

V1.0.4 (Release - Donationware):
- Implement method to subscribe a topic with QoS

V1.0.5 (Release - Donationware):
- Now can be used isConnected method "BEFORE" the first connection

Thanks!

 

[Alberto Iglesias]

Hello Jake,

You can download now with the same link in email you receive.

Version 1.0.2 for B4J

Thanks

 

[JakeBullet70]

Thanks.
I did notice that the version number still says 1.0.1
But the new methods are there.

Thanks again!!!!

 

[CanguroCode]

How can I upload my own broker server? any host?

 

[Alberto Iglesias]

You can get in

http://mosquitto.org/download/

 

[CanguroCode]

<English>
But, can i upload to host service free? or is for install in a local machine then access with a noip program? I need remote access to a arduino device
through message text.

<Spanish>
Pero puedo subirlo a un servicio de host gratuito (preferiría subirlo que usar uno de acceso público) o tengo que instalarlo en la computadora local y luego acceder con un programa como noip? Básicamente quiero crear un broker para un arduino y acceder remotamente enviándole mensajes.

Saludos

 

[Alberto Iglesias]

Mira este servicio en la nube

cloudmqtt.com

Hay gratis y de pago

Un saludo

Alberto

 

[CanguroCode]

<English>
Thank's for your interest, I have searching for information about this protocol, and I think, I going to give a try to the raspberry. Do you know if exist a serious security problem?

<Spanish>
Gracias por el interés, He estado buscando información de este protocolo y creo que probaré el raspberry. ¿Sabes si existe algún problema serio de seguridad?

 

[Alberto Iglesias]

Quieres saber se hay problemas con el protocol o con el raspberry?

El Raspberry yo no conosco, no puedo te informar.

Con el protocol si que es seguro, pues varias empresas automobilisticas ya estan utilizando, asi que ya pasó por inumeras pruebas de seguridad

 

[CanguroCode]

<English>
In this moment i can say in Raspberry 2 works, I don't think was so easy, thank you for the lib. I will recharge my paypal account and buy you a coffee. BTW, is 10 EU for each lib right?

<Spanish>

En este momento te puedo confirmar que en el Raspberry 2 funciona perfectamente, no pensé fuera tan fácil, gracias por la librería, recargaré mi cuenta de paypal para invitarte un café. Por cierto, ¿son 10 euros por cada librería, cierto?

Saludos

 

[CanguroCode]

<English>
BTW when I run the example code, the logs showme a message (red color), what's mean?


<Spanish>
Por cierto al ejecutar el ejemplo me aparece el siguiente aviso (color rojo) que significa?