mqtt

MQTT系列 | MQTT 5.0协议新特性

試著忘記壹切 提交于 2019-11-28 20:16:55
目前支持和使用最广泛的版本是MQTT 3.1.1版本。2017 年 8 月,OASIS MQTT Technical Committee 正式发布了用于 Public Review 的 MQTT 5.0 的草案。2018 年,MQTT 5.0 已正式发布,但是目前支持 MQTT 5.0 的 Broker 和 Client 库还比较有限。 作为 MQTT 3.1.1 的后续版本,为什么版本号直接变成了 5.0?因为 3.1.1 在 CONNECT 的时候指定的 Protocol Version 为 4,所以后续版本只有使用 5 了。 MQTT 5.0 在 MQTT 3.1.1 的基础上做了很多改变,并不是向下兼容的。在协议上,就增加了 Property 字段,也正是因为这个字段,使得MQTT 5.0可以支持众多的新特性。下面将从以下几个新特性进行介绍,这些新特性能够解决在3.1.1版本中较难处理的问题。 1. 用户属性(User Properties) 5.0 中可以在 PUBLISH、CONNECT 和带有 Return Code的数据包中夹带一个和多个用户属性数据: 在 PUBLISH 包中携带的用户属性由发送方的应用定义,随消息被 Broker 转发到消息的订阅方; CONNECT 和 ACKs 消息里面也可以带发送者自定义的用户属性数据。 在实际的项目中

使用openssl加密mqtt

时间秒杀一切 提交于 2019-11-28 19:57:25
昨天弄了一天,还没弄出结果,先做个记录,有空继续。 主参考: https://blog.csdn.net/a704397849/article/details/88885198 openssl概念,安装,使用: https://segmentfault.com/a/1190000014963014 https://blog.csdn.net/sunhuansheng/article/details/82218678 1)下载openssl: http://slproweb.com/products/Win32OpenSSL.html 2)根据系统属性,选择下载Win64 exe文件,双击安装之后,将安装路径配置到环境变量Path中: 3)启动一个cmd,输入openssl就能用了: 配置emqttd使用ssl: 编辑 emqttd安装目录下etc/emq.conf mosquitto的使用 : https://mosquitto.org/ 下载 双击安装之后,将安装路径添加到Path中 打开cmd就能使用mosquitto指令了。 来源: https://my.oschina.net/u/4042451/blog/3098868

How do you set up encrypted mosquitto broker like a webpage which has https?

守給你的承諾、 提交于 2019-11-28 17:59:36
问题 I'm trying to setup a mosquitto broker which is encrypted using ssl/tls. I don't want to generate client certificates. I just want an encrypted connection. The man page only described the settings which are available, not which are needed and how they are used. Which settings are needed and how do you set them? I use mosquitto 1.3.5 回答1: There is a small guide here, but it does not say much: http://mosquitto.org/man/mosquitto-tls-7.html You need to set these: certfile keyfile cafile They can

Can a web browser use MQTT?

女生的网名这么多〃 提交于 2019-11-28 17:01:03
We are looking at using MQTT as the messaging protocol on a new device we're building. We'd also like a web interface for the device. Does anyone know if you can implement a browser client app (without additional plugins) that talks MQTT? hardillb Yes, as mentioned in Steve-o's comment MQTT via websockets is very possible. There are 2 options at the moment IBM's MQ 7.5 comes with websockets support, you can find details here . The Mosquitto broker has a javascript client with an example running here . To answer your second question lighttpd has a websockets module that can be used to do

C# client library for subscribing/publishing MQTT (Really Small Message Broker)

徘徊边缘 提交于 2019-11-28 16:52:31
问题 I need to implement the push notification for Android but there will not be internet access and only intranet access is available. So I think I cannot use C2DM and third party API like UrbanAirship. So I am thinking of using MQTT RSMB(Really Small Message Broker), C# .net as Publisher to the broker and wMqtt.jar for Android as subcriber to the broker. I have downloaded the RSMB and found the followings exe: -broker.exe -stdinpub.exe -stdoutsub.exe I have successfully subscribed from Android

MQTT vs. XMPP Which Should I Choose? [closed]

不问归期 提交于 2019-11-28 15:18:15
Overview I am sending messages back and forth between a client (Android phone) and a Server (Windows Server). Using a persistent connection over TCP, which protocol would be the best solution. I am looking at performance, scalability, size of messages, and battery life. The messages must arrive at the destination in order and can not be duplicates. MQTT This seems like the better solution, but there seems to be little examples of large implementation with lots of users. I am not sure if I can integrate this into the windows server, or if it would have to be another application or server

How to display delivered and read receipts in MQTT broker Mosquitto?

生来就可爱ヽ(ⅴ<●) 提交于 2019-11-28 14:49:07
I want to display delivered and read receipts to users in my messaging platform. I am using Eclipse's Paho library with Mosquitto as the broker. Since Mosquitto does not store messages, which is the best way/plugin to Display delivered receipts - how to use QoS2 acknowledgement receipts to do this? Display read receipts - suggest me way to do this How to store messages so that users can view their chat history ? Any architectural insights in mysql will be very helpful. The quick answers to your questions: High QOS (1/2) is not end to end delivery confirmation, it is only confirmation between

Centos 7 安装MQTT(EMQ)服务端

我的未来我决定 提交于 2019-11-28 14:24:13
简介 EMQ 管理控制台 (EMQ Dashboard,以下简称 Dashboard) 是 EMQ 提供的一个后端 Web 控制台,用户可通过 Web 控制台查看服务器与集群的运行状态、统计指标,进行插件配置与停启、简单的连接测试等操作。 安装EMQ步骤 安装所需要的依赖包 yum install -y yum-utils device-mapper-persistent-data lvm2 使用以下命令设置稳定存储库,以 CentOS 7 为例 yum-config-manager --add-repo https://repos.emqx.io/emqx-ce/redhat/centos/7/emqx-ce.repo 安装特定版本的 EMQ X sudo yum install emqx-3.1.0 启动 emqx start 查看状态 emqx_ctl status 访问控制台 ,默认账号为admin,密码为public 设置中文及主题 EMQ 断开会话连接方法:重启服务 cd /usr/lib/emqx/bin #进入bin目录下 ./emqx restart #使用脚本重启 来源: 51CTO 作者: 低调的男孩 链接: https://blog.51cto.com/13760351/2454399

搭建mqtt服务器apollo

醉酒当歌 提交于 2019-11-28 13:34:26
使用的apollo,官网太慢,附上百度云下载地址: 链接:https://pan.baidu.com/s/1NIq6R71hlyPuaUBwPoMPNg 提取码:36vw 原文链接:https://blog.csdn.net/yangsong4353/article/details/87967561 需要注意的是想要在宿主机上访问,需要修改 Apollo监控页面配置   vi /opt/apollo/mybroker/etc/apollo.xml   修改   http://127.0.0.1:61680“/>   https://127.0.0.1:61681“/>   为   http://0.0.0.0:61680“/>   https://0.0.0.0:61681“/> MQTT服务器尝试过两种,一种是 Mosquitto、另一种是 Apollo,本次记录Apollo 在CentOS 7.6 linux 下的安装和测试。 Apollo下载地址: http://activemq.apache.org/apollo/versions/1.7/website/download.html 下载后的文件放置在Downloads文件夹下,对此压缩包进行解压。 有可能需要进入root权限,输入su,之后输入密码,进入root权限。 解压: tar -zxvf apache-apollo

How to use paho mqtt client in django?

我只是一个虾纸丫 提交于 2019-11-28 09:19:52
I am writing a django application which should act as MQTT publisher and as a subscriber. Where should I start the paho client and run loop_forever() function. Should it be in wsgi.py ? Update: If you need Django running in multiple threads then to publish messages from your Django app you can use helper functions from Publish module of Paho - https://eclipse.org/paho/clients/python/docs/#id17 You don't need to create an instance of mqtt client and start a loop in this case. And to subscribe to some topic consider running mqtt client as a standalone script and import there needed modules of