mqtt protocol

Fusesource version: Mqtt-client-1.10.jar Download Address: https://github.com/fusesource/mqtt-client Fusesource provides three ways to publish messages: 1. Using a blocking connection (blockingconnection) 2. Using a callback connection (callbackconnection) 3. Use the future-style connection (futureconnection) Where the callback API is the most complex and the best performance, The other two are encapsulatio

What is the industrial Internet of things?In short, it is the specific application of the Internet of things in industrial control.What is SSL/TLS?SSL (secure Sockets layer Secure socket), and its successor Transport Layer Security (Transport layer Security,tls) is a security protocol that provides security and data integrity for network traffic. TLS encrypts the network connection with SSL at the transport layer. Most of the Internet login is the use

ObjectiveThe MQTT protocol focuses on network and resource-constrained environments, and it is normal to not consider the Web environment at the beginning of the establishment. Nevertheless, it does not mean that it is not suitable for the HTML5 environment.HTML5 WebSocket is a two-channel communication based on TCP, similar to TCP communication, and is suitable for web browser environments. Although the

Linkit Series Blog:MediaTek Linkit 7688 (a) Get started and build OpenWrt cross-compilation environment under Mac, C language compilation Hello,worldMediaTek Linkit 7688 (ii) GPIO basic operation and C language programmingMediaTek Linkit 7688 DUO (iii): Control peripherals and sensors via ArduinoLinkit 7688 DUO (iv): access to various Arduino sensors and modules-basicLinkit 7688 DUO (v) connected with various Arduino sensors and modules-extensionsLinkit 7688 DUO (vi) joins the

ObjectiveWhen the Mqtt protocol was born, it was never considered for transmission over HTTP. This is also normal, network constrained, unstable network is not suitable for HTTP (2g/3g network everyone using WAP is not OK). On the desktop side of the network more abundant, although the pure text contrast binary is not much advantage, subject to historical legacy and usage habits, as well as a large number o

What is the MQTT protocolMQTT (Message Queuing Telemetry transport protocol) is a lightweight two-way message Transfer protocol developed by IBM in 1999 for applications such as the Internet of Things (IoT), primarily to address the problem of communication between devices used on the IoT and communication between these devices and back-end application systems.Wh

In the article "IoT core protocol-message push technology evolution" has been introduced to the reader of a variety of message push technology, including HTTP one-way communication, Ajax polling, Websocket, Mqtt, COAP, etc., wherein the MQTT protocol is developed and pushed by IBM, it has an open, simple, Lightweight a

Introduction The first time I heard about MQTT, I was trying to find a solution for mobile push. Later I found that JPush is really good, and then I won't make any effort. Recently, I suddenly felt a whim, I read the MQTT protocol, and there are manyChineseAll the materials are pitfall, all of which are MQTT-based push

Introduction The first time I heard about mqtt, I was trying to find a solution for mobile push. Later I found that jpush is really good, and then I won't bother with it. Recently, I suddenly burst into a whim and put mqttI read the Protocol once, and there are a lotChineseAll the materials are pitfall, all of which are mqtt-based push. All of my photos are repr

ObjectiveImmediately after the first introduction, this article is the second, the main carding MQTT-SN 1.2 protocol defined in the message format.Generic message Format message Header Other variable parts 2/4 byte representation N-Byte composition Message header length Message Type 1 or 3 bytes 1 by

ObjectiveThe MQTT 3.1 protocol is not good enough in a weak network environment (such as 2G/3G, etc.) and is therefore reflective.Performance under weak network environmentMobile phones and other terminals in a weak network environment packet loss will be very obvious, the connection to MQTT server success rate is very low. Compared to simple requests-the corresp

ObjectiveThe previous note has gone through all the message types and tried to decipher it from the point of view of the message flow.Network failureIn any network environment, there will be a connection failure, such as leaving the company door at the moment without a WiFi signal. But the other end of the persistent connection-the server may not immediately know that the other side is disconnected. Similar to the network anomaly, it is possible that the message is sent in the process of occurre

ObjectiveImmediately above, this is the third article, mainly on the MQTT-SN 1.2 protocol for the overall function of the description.Well, this part can be compared with the MQTT protocol.Broadcast and discovery of gatewaysThe gateway can broadcast advertise messages to all clients periodically in the wireless personal area network Wpns only after a successful c

ObjectiveMQTT (Message Queuing Telemetry Transport), an IoT transport protocol, is designed for lightweight publish/subscribe messaging, designed to provide reliable network services for IoT devices in low-bandwidth and unstable network environments. MQTT is a lightweight transport protocol developed specifically for the Internet of things. The

Introduction to the MQTT protocol Based on TCP/IP protocol Lightweight message subscription and release (publish/subscribe) protocol Primarily for the internet of Things-iot (things) Usage Scenarios Communication, machines end-to-end communication, such as data communicati

ObjectiveMemory is not very good when, can only look at the previous article/notes to review again, but could not find the MQTT protocol about the subscription part of the description, very hard to find from Evernote, so the entire MQTT protocol notes, it is more complete.SUBSCRIBEIn general, after the client has succe

ObjectiveMemory is not very good when, can only look at the previous article/notes to review again, but could not find the MQTT protocol about the subscription part of the description, very hard to find from Evernote, so the entire MQTT protocol notes, it is more complete.SUBSCRIBEIn general, after the client has succe

Encounter an MQTT problem today, MQTTEXCEPTION:MQISDP ClientId > bytesThe ClientID is longer than 23 o'clock and cannot be linked to an MQTT server.After viewing protocol discovery:Client Identifier (Client ID) is between1and the ata unique identifier for the client-to-server character length. It must be in the search for a client to connect to a server is unique

Recently in a project to use the message push, after searching the internet for a while to find IBM's two MQTT libraries, respectively, Wmqtt.jar and Mqttv3.jar. This article is mainly for the use of Mqttva.jar library to explain.The first choice is to build the ACTIVEMQ server. ACTIVEMQ Server installation and dynamic line can be online Baidu or other engine search, the introduction is very complete.First, use ADT to establish the following worksThe

Mqtt(Message Queuing telemetry transport, Message Queue telemetry transmission) is an instant messaging protocol developed by IBM. It is mainly used in the Internet of Things to implement the real message push function. (1) mosquittoIs an implementation of the mqtt protocol. Open source acquisition: http://www.oschina