mosquitto

问题 I want to reload the mosquitto password file when it is changed. Is possible to send SIGHUP ("signal hang up") or some equivalent to mosquitto server on windows? 回答1: It is possible to do so. First you have to set your mosquitto.conf to save the pid in a file by specifying the pid_file. pid_file your/pid/file Then you can call $kill -SIGHUP $(cat your/pid/file). Or else if you already know the PID of the mosquitoo, then you can do $kill -SIGHUP PID This will send sighup signal and reload the

问题 I am Working on MQTT communication using Paho and Mosqitto. We have to support both model of serialization - xml and json. So I am looking How to identify the content type or payload type in MQTT. Is there something similar HTTP Content-Type in MQTT to identify it quickly ? Content-Type : application/json Content-Type : application/xml Thanks 回答1: No, MQTT payloads are just byte arrays and there is no space in the headers (because MQTT is designed to be as light weight as possible on the

问题 I am working on an application that will use mqtt. I will be using the python library. I have been leaning towards using mosquitto but can find no way of programmatically setting access control limits for it. The application I'm writing needs to be able to differentiate between users, and only allow them to subscribe to certain topics. The current solution looks like this is done from a config file. Is there a scalable solution to access control limits in mosquitto? If not, do you know of a

问题 Does anybody know where I can get some example MQTT client Go (golang) code that does both publish and subscribe in an infinite loop ? I am messaging with a Mosquitto broker running on MacOs. In more detail... Get a message from the network (a topic) Compute something based on that message Send the result of the computation back to the network (topic) Here is the code I am using: package main import ( "fmt" MQTT "github.com/eclipse/paho.mqtt.golang" "os" "time" ) var knt int var f MQTT

问题 How are users getting past a 1024 connection limit in Linux in association with doing MQTT for push notification? I am using Mosquitto server, which I think I read does not have a 1024 connection limit built into the linux version. So, can I use a single server (no bridging etc) and get 5,000, 10,000+ users? Or, do I absolutely need bridging? I haven't seen a lot of writing on how this is setup other than the config settings man page for mosquitto. Or, can I get by with just modify a few

问题 I am trying to configure a Pre Shared Key encrypted connection between a mosquitto mqtt broker and an application written in Java which uses the Eclipse Paho client library. I have successfully made connections between the two using no encryption and using SSL where the Server certificate is authenticated but with no client certificate. I would like to get the connection encrypted (authentication not important) by using a Pre Shared Key, which is definitely supported by the mosquitto broker,

问题 I have one load balancer i.e aws elb all the pub/sub will be coming via that elb two mosquitto broker A & mosquitto broker B under elb one mosquitto broker to sync topic between this two brokers(mosquitto.broker.sync) TRY ONE this is how the configuration for mosquitto broker which sync topics between node A and B looks alike mosquitto.broker.sync: ## connection mosquitto-bridge try_private false address mosquitto.broker.A:1883 mosquitto.broker.B:1883 start_type automatic round_robin true

问题 Hello guys my problem is that I need to keep device(clients) status as they are online or not. I am connecting through a client id and from subscribing there will topic I can get to know that device is disconnected but if they connect again how can I check they connect again. 回答1: The short answer is you don't (at a protocol level). Publishers and subscribers are totally unaware of each other, messages are sent to topics not to specific subscribing clients. The slightly longer version: You

问题 I have just started learning using MQTT protocol with Android Studio. Using mosquitto broker, I am able to exchange messages between pub/sub windows. But when I send message to broker through android studio, the app builds successfully but nothing displays on broker's end & system prints Connection Failure. The same code works fine on eclipse java application, but not working on android although required libraries and dependencies have been added. Please help, what am I missing in this basic

问题 I am new to Mosquitto and MQTT , I downloaded the Mosquitto server library but I do not know how to test it. Is there any way to test the Mosquitto server? 回答1: In separate terminal windows do the following: Start the broker: mosquitto Start the command line subscriber: mosquitto_sub -v -t 'test/topic' Publish test message with the command line publisher: mosquitto_pub -t 'test/topic' -m 'helloWorld' As well as seeing both the subscriber and publisher connection messages in the broker