paho

What is difference between MQTTAsync_onSuccess and MQTTAsync_deliveryComplete callbacks?

由 我怕爱的太早我们不能终老 提交于 2019-12-11 14:53:29
问题 I'm learning about MQTT (specifically the paho C library) by reading and experimenting with variations on the async pub/sub examples. What's the difference between the MQTTAsync_deliveryComplete callback that you set with MQTTAsync_setCallbacks() vs. the MQTTAsync_onSuccess or MQTTAsync_onSuccess5 callbacks that you set in the MQTTAsync_responseOptions struct that you pass to MQTTAsync_sendMessage() ? All seem to deal with "successful delivery" of published messages, but from reading the

MQTT client in MVC application

由 早过忘川 提交于 2019-12-11 08:24:49
问题 I'm working on a MVC application that serves as a MQTT client. I'm using the C# library M2Mqtt from paho. Basicly every time someone presses a button on my website, I want a message to be published, and it will recieve an answer aswell (thus it subscribes to a topic aswell.) My question is: do I have to connect to the broker every time again when pressing the button (calling an ActionResult that publishes the message) or is there a way to keep the connection alive (f.e. initializing it in

Regarding the MQTT fixed header structure?

由 回眸只為那壹抹淺笑 提交于 2019-12-11 07:44:41
问题 i am trying to implement a MQTT library. And according to a tutorial, the fixed header of the MQTT message should look like as shown in the posted picture. Also in the same tutorial, i found that the encodeing method of the fixed header is written as: mqtt.write((byte) ((retain ? 1 : 0) | qos << 1 | (dup ? 1 : 0) << 3 | type << 4)); My Question is, according to the fixed header specifications posted, the fields retain , qos , dup and the msg type should have 1 , 2 , 1 and 4 bits respectively.

Trying to publish in messageArrived() with the Paho Client MqttCallback

由 你。 提交于 2019-12-11 04:08:02
问题 I'm trying to publish the response to the incoming message in messageArrived(...) . But the publish hang and the next line: logOutgoingMessage(topic, message) is never called... At the end i get a deadlock and the client disconnect. Here is my code: @Startup @Singleton public class AppliMqttClient implements MqttCallback { @EJB private AppliFacade facade; @PostConstruct public void start() { try { // connection options connOpts = new MqttConnectOptions(); connOpts.setKeepAliveInterval(120);

How to build a system to handle MQTT broker and Django

由 穿精又带淫゛_ 提交于 2019-12-10 23:44:02
问题 I am planning to build a home automation system where IoT devices communicate with the MQTT broker.The system also involves a Django web server that serves API for ios/android devices. I will describe an example of what I want to implement. An API call is made from mobile app to Django server to turn ON a device. When such API request is made to Django, it should push 'Turn ON' data to IoT device via MQTT protocol. Also, IoT devices send some real time data to the MQTT broker. Upon receiving

Paho-mqtt callbacks in different classes android java

由 你说的曾经没有我的故事 提交于 2019-12-10 17:29:29
问题 I've just started Java Android programming, or even Java programming in general and I wanted to implement the Paho MQTT Android Service using a certain MqttHandler class and I want to set the callback as a parameter for the MqttHandler class. Other answers regarding callbacks in general suggested using an interface class but I don't know how that works. This is what I have tried: public interface InterfaceMqttCallback extends MqttCallbackExtended{ @Override public void connectComplete(boolean

【物联网开发】基于STM32的端到端物联网全栈开发

由 我怕爱的太早我们不能终老 提交于 2019-12-10 08:08:23
详细课程链接： 【物联网开发】基于STM32的端到端物联网全栈开发 物联网平台是阿里云针对物联网领域开发人员推出的一款设备管理平台。高性能IoT Hub实现设备与云端稳定通信，全球多节点部署有效降低通信延时，多重防护能力保障设备云端安全。此外，物联网平台还提供丰富的设备管理功能、稳定可靠的数据存储能力，以及规则引擎。使用规则引擎，您仅需在Web上配置简单规则，即可将设备数据转发至阿里云其他产品，获得数据采集、数据计算、数据存储的全栈服务，真正实现物联网应用的灵活快速搭建。 物联网平台是阿里云专门为物联网领域的开发人员推出的，其目的是帮助开发者搭建安全性能强大的数据通道，方便终端（如传感器、执行器、嵌入式设备或智能家电等等）和云端的双向通信。 课时介绍： 课程指南 阿里云物联网平台简介 阿里云物联网平台基础概念讲解 STM32节点端及开发环境介绍 Paho MQTT客户端接入阿里云物联网平台 LinkKit SDK接入阿里云物联网平台 服务端软件架构介绍 后端服务开发 前端服务开发 更多精品课程： 阿里云大学官网（ 阿里云大学 - 官方网站，云生态下的创新人才工场 ） 来源： oschina 链接： https://my.oschina.net/u/3637633/blog/3043534

Paho MQTT client connection reliability (reconnect on disconnection)

由 青春壹個敷衍的年華 提交于 2019-12-09 06:40:03
问题 What is the most reliable way to use the Python Paho MQTT client? I want to be able to handle connection interruptions due to WiFi drops and keep trying to reconnect until it's successful. What I have is the following, but are there any best practices I'm not adhering to? import argparse from time import sleep import paho.mqtt.client as mqtt SUB_TOPICS = ("topic/something", "topic/something_else") RECONNECT_DELAY_SECS = 2 def on_connect(client, userdata, flags, rc): print "Connected with

java.io.EOFException with paho

由 不羁岁月 提交于 2019-12-09 05:54:37
问题 i want to make stress test on mosquitto, so i create some code as below for (int i = 0; i < 800; i++) { final int j = i; Thread t = new Thread(new Runnable() { @Override public void run() { System.out.println(j + " : ************"); try { MqttClient client = new MqttClient("tcp://192.168.88.203", SERVER_CLIENTID_PREFIX + j); client.connect(); MqttMessage message = new MqttMessage((j + ":me").getBytes()); message.setQos(2); client.publish(TOPIC_PREFIX + j, message); } catch

The callBacklistener is called Twice?

由 北城余情 提交于 2019-12-08 16:29:38
In the below, when i run it and intentionally turn the WiFi off, the callBack clientCallBack.connectionLost displays the message Log.d(TAG, "@connectionLost: MQTT Server connection lost"); twice. And When I re connect, the message Log.i(TAG, "@onSuccess: Connection Successful."); in the client_1.connect callback is displayed only once. anyone can expain why i receive the message from the calback twice? Code @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mqtt_proj_01_layout); sdCard = Environment
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