mqtt

Hello all, I am writing an app which uses MQTT, and I find a problem with "wait for". In an activity "info" I must collect several data from MQTT: every datum is asked for by publishing a topic and waiting for the reply. I would like to write several lines like: Sub Activity_Create(FirstTime...

Hello I want to use an encryptes MQTT connection in all my B4J projects. My local Mosquitto MQTT broker has been configured to use TLS with a server and client certificate, both self signed, but there is no option in the library to parse the certificate to setup the connection. I followed this...

Hi Here a sample program to control/monitor 8+8 digital Out-Inp, plus an I2C ADC. The program use the MQTT protocol. This program is an evolution of the previous one I posted. This version add the monitor of 8 digital Input and four analog input read by ADC (ADS1115).

Hi everyone i'm trying to use MQTT for the first time. I follwed this example. It connects succesfully but unfortuntely when I receive a message this error shows up Error occurred on line: 96 (B4XPage_Details) Error decompressing data Stack Trace: ( CoreFoundation...

Hi everyone, I attached simple example for streaming audio from B4A to B4J over internet using MQTT. Enjoy without limitations of Server/Client problems over internet such as ISP block. You can use this approach to create a lot of things such as Radio station, voice call, etc ...

Hi, I have a problem with mqtt library version 1.01 I have to connect via ssl connection to my mosquitto server; I followed the tutorial at this link https://www.b4x.com/android/forum/threads/b4x-mqtt-ssl-and-self-signed-certificates.100973/#content, but I have these errors...

Hello everyone! I must make an app (to be more specific 2 apps Android & IOS). I want to connect with AWS MQTT Broker, via MQTT protocol. I made a lot of tries to achieve a connection (first of all, and then publish-subscribe to a topic), with no success. Is there someone, who has used AWS, to...

Hello I'm using mqtt to subscribe a large number of topics, i noticed that sometimes i get the "Client connected (32100)" error. When this happens, the client disconnects without triggering the _disconnected event. This seems to happen sometimes when receiving multiple topics after...

I was just trying to make my first project with B4R. Also, I was a newbie in microcontroller programming. In this my first project, I make a dashboard in Node-RED to display a value from the ESP32 and to control the blue LED on ESP32. The value had been successfully sent, but until now the...

I am trying to connect to a data streaming API and below is an extract from the API documentation (in red italics). Connection to the message broker is made using a Websocket connection and the message broker makes use of the MQTT protocol. So my initial obstacle is that I understand that...

I have a program, made with B4J (ver. 8.50) which is active 24 hours a day on Windows 10 professional pc This program connects with a mqtt broker, Mosquitto, to 'read' the commands that some phones send, commands that must be executed on the pc The program works correctly, but using the Windows...

Vorrei passare su pc un file di testo che si trova nella memoria Android Smartphone e pc comunicano via mqtt L'invio e la ricezione avvengono correttamente Ma, lato ricezione, uso questo codice: Private Sub mqtt_MessageArrived (Topic As String, Payload() As Byte) Dim out As OutputStream =...

This updates the PubSubClient to v2.8 These functions have been added to B4R: IsConnected SetBufferSize SetKeepAlive SetSocketTimeout You must exchange the included folder and xml file in B4R folder: C:\Program Files (x86)\Anywhere Software\B4R I hope that this could be added to B4R, so it...

Sto realizzando il trasferimento di file di testo da un'app Android verso pc Vedo che le vie classiche prevedono installazione server http oppure ftp sul pc, in ascolto ed in grado di ricevere il file Avendo gia' un progetto che utilizza mqttra Android e pc la comunicazione mqtt, mi chiedevo se...

Qualche anno fa, Oracle ha usato il termine 'unbreakable' per il suo database Vero o non vero, sicuramente ha attirato l'attenzione Bon, tornando a noi, la domanda e': - come realizzare una comunicazione 'unbreakable' tra app Android e pc, via mqtt ? Cadute connettivita', riavvio server mqtt...

Sto sperimentando un po' con le comunicazioni via Mqtt Come server (o come broker) sto usando Mosquitto installato su uno dei pc della lan, con relativo instradamento sul router per farlo trovare anche da dispositivi esterni alla lan Vedo che esistono molti servizi che offrono il server Mqtt sia...

Sto cercando di realizzare la comunicazione via Mqtt tra diversi pc e diversi smartphone, la classica chat In tutti i post si parla di 'broker' Non ho ancora capito esattamente se per 'broker Mqtt' si intenda indicare il 'server Mqtt' Analogamente ad un server di database, il programma cui i...

Per comunicare rapidamente da pc centrale a uno o piu' smartphone Android ho usato finora Firebase Realtime oppure le notifiche push Firebase Cloud Messaging Vedo che usando il sistema di messaggistica su server Mqtt sono realizzabili grossomodo le stesse funzionalita' Ci sarebbe pero' il...

Hey All, Before I get too far down this rabbit hole I figured I'd ask the community. I have a B4J project and have been able, with great help from everyone, to get outgoing SMS texting set up and working. I wasn't planning on having two way communication, but since I've got extra time...

Hi, I`m trying to get the MQTT setup between an ESP board and B4A. I have tested the MQTT with Autodiscovery between two phones and works perfectly, however, I can`t get it to work with the ESP. The code on the ESP is waiting for topic and I don`t see how that is used in the B4A MQTT example?