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What is MQTT? "MQTT is a Client Server publish/subscribe messaging transport protocol. It is light weight, open, simple, and designed so as to be easy to implement. These characteristics make it ideal for use in many situations, including constrained environments such as for communication in Machin
link: See the last post: https://www.b4x.-to-internal-libaries.48274/#post-373825
link: When I follow the above link to V2.10 of jRandomAccessFile I can only seem to get hold of 2.06 which doesn't have the serializator options, obviously
link: On top of Erel's comments, I would add the following to explain why MQTT is a superior protocol to WebSockets, at least for IoT applications, multi-cl

Updated libraries: https://www.b4x.-raspberry-pi-i-o-library.136113/#content This is a wrapper for Pi4J library. It allows you are control the Raspberry Pi board GPIO pins. Using this library is quite simple. You can use it from a UI app or non-UI app. First you should initialize a GpioController
link: See here: https://www.b4x.-iot-raspberry-wiringpi-b4j-lcd-2x16.60252/ It's all about the mapping. Take a look to the table (GPIO2 is not always PIN2)
link: Dear Erel, Thanks again for the updated version of jPi4J but I get the same problem as described here: https://www.b4x.com/android/forum/threads/iot-j
link: As written in posts 63 & 64, orangepi is not supported by this library. I've found this link to a library that does it for orange. Is it possible to w

This example demonstrates how the B4X tools can be used to create a solution with multiple types of components and communication channels. See the following video (make sure to watch it in HD resolution): noQLB3wo47k The components in this example: - Intel Edison (B4J - jMRAA library) - Raspberry
link: MQTT is simpler when you want to send a message to multiple clients. You don't even need to know which clients are connected. For example when you ch
link: What advantage have you had using MQTT instead of a web server (b4j)?
link: Yes. See this tutorial on the required configuration: https://www.b4x.com/android/forum/threads/iot-linux-embedded-boards-gettings-started.60430/#cont

Ola We have just launched a product to track your IoT devices on the globe. This is purely developed with BVAD3. WebServer - B4j jetty BackEnd - MySQL using jDRC with own API for our endpoints Cloud Messaging - Firebase for Realtime location updates WebApp Connection Layer - MySQL via PHP Maps - G
link: hi i need some help with this project , is interesting for a job i working on , if you share me the source code you help me so much

Run the attached example and monitor the logs. You can enable debug logs with this line: SetSystemProperty("bluecove.debug", "true") Assuming that everything works properly then you should see the MAC address in the logs. You can use this address to connect from the Android device
link: Thank you @Erel, this is excellent...
link: So awesome Erel ... thanks!!

Adafruit IO is a cloud service built for IoT solutions. It provides two interfaces: MQTT and REST API. It is very simple to use it with B4X as demonstrated in this example. It is more than a MQTT broker. It also saves the historic values and allows integration with other services. As this is a clou
link: Note that this example is also based on the same MQTT library. The main differences between Adafruit IO and a local MQTT broker are: - Adafruit IO i
link: Very nice Erel, I might look into this but parts of my home is already running on MQTT from another supplier, so changing to Adafruit IO will just be

This is a simple example of a traffic light implementation using Raspberry Pi 2. The red, yellow and green leds are connected to pins 27, 28 and 29 (see the numbering scheme: http://pi4j.com/pins/model-b-plus.html). https://www.b4x.com/basic4android/images/SS-2015-09-02_12.40.21.jpg Using a timer
link: I guess that the purpose of the second state (red + yellow) is to allow drivers to distinguish between the transition to red and the transition to gre
link: interesting that you have 4 states. In Belgium (and Holland?) it's just green, orange, red And I believe in Luxemburg it's green, green+orange, red
link: To perform traffic lights in OrangePi you have to write these lines in the terminal: sudo su sudo modprobe gpio-sunxi then use this https://www.b4x.co

The messages are made of a comma separated string with the target, led or switch number and the state. The XBee modules are configured in AT (application transparent) mode. One is configured to be the coordinator and the other is configured as a router. https://www.b4x.com/basic4android/images/S
link: Hi Erel, thanks for this. Now I really need to play with my RPI :). BTW is android device required rooted?
link: Wow, i'm getting excited to start playing around with my Electronics stuff again, haven't done anything in a long time, i have a few of this Xbee modu
link: Yesterday I attended a local conference about IoT. Two speakers described an industrial solution that they were involved with. Both of them used ZigBe

4. Connect the IDE to the IP address printed in the terminal (Tools - B4J Bridge - Connect). Note that B4J-Bridge will print the first ip address reported by the OS. It is possible that the board has multiple ip addresses. You an enter any of the ip addresses in the IDE.
link: Please start a new thread for this question.
link: I just unpacked my raspberry pi 3 and am trying this. I got the bridge running with this command: java -jar b4j-bridge.jar (not jdk- .....that did not

Hi, enhanced my Domoticz modular Home Automation Solution (running on the Raspberry Pi), with the "HouseWatch" module which sends Firebase messages to Android devices. The module is based upon this thread. Messaging Flow B4J Non-UI program (Raspberry Pi) listening to MQTT messages from selected D

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