Good day
I would like to host MQTT V1.3 or V1.3.1 with Mosquitto on Windows. The client I am connecting with only supports V1.3 and V1.3.1 while Mostquitto also supports V5.
How do I configure or how can I determine what version of MQTT has been hosted?
Thank you
The CONNECT packet is the first thing sent over the connection and includes a "Protocol Level" (v3.0 & 3.1 = 3 (cannot differentiate these two versions), v3.11 = 4, v5 = 5).
The broker will process this and, if it does not support the requested level, respond with 'Unsupported Protocol Version' and disconnect.
If the broker supports multiple versions of the protocol it will use the "Protocol Level" to determine which version of the protocol to use for the specific connection (it's quite possible to have v3.1.1 and v5 clients connected to Mosquitto at the same time).
Related
Is there any way to communicate between socket server 4.4.1 and socket client 2.2.1 (at least temporarily until the clients upgrade their application)?
Technology stacks are node-based server and ios-based mobile application.
I am doing lot of analysis for a new Java MQ client requirement got some doubts. Currently in the Unix system Queues Queue manager all created where MQ server is running.
In order to run Java MQ client we are going to install MQ client on other Unix Solaris system. Mean while we had one windows server where MQ client installed before going to MQ client installation on unix System need to clear my clarifications.
Since I am new MQ.
Can we run Java MQ client from windows server to connect MQ server unix system(Queues,Queuue Manager)
If yes what need for this to connect Windows Server to unix Solaris
The code is compiled with MQ libraries
Is any error will come to face.
It would be great if you provide steps or solution.
Yes, you can run the Java MQ client from any machine to connect to a queue manager on any other machine. The MQ Clients (Java, 'C' or .NET version) all support any platform to any platform combinations, and all support any MQ version to any MQ version. So for example, you can have a V8 Client on Windows connecting to a V9 Queue manager on Unix. Equally you can have a V9 Client on Windows connection to a V8 Queue manager on Unix, i.e. any to any version can be upwards or downwards.
In order to connect a client to a queue manager, you will need the client libraries on the client machine, in your case the Java client.
You will also need to ensure that your queue manager has a TCP/IP listener running and that you know the port number.
You will need a channel definition on the queue manager of a type called SVRCONN, and know the name of it. e.g.
DEFINE CHANNEL(MQGEM.SVRCONN) CHLTYPE(SVRCONN) DESCR('Channel for my client application to connect to')
In order for your Java client to connect to the queue manager it will need to use
The channel name
The host name of the machine where the queue manager is running
The port number of the TCP/IP listener
If you face any errors, they may be related to connectivity, because your application is connected by the network to the queue manager. Remember to pay attention to any return codes you get from MQ, they will be in the form of 4 digits, e.g. 2059. For Java you should ensure you get hold of the linked exception. It may also be useful to look in the error log of the queue manager too.
You may also face security errors if this is your first use of IBM MQ. The queue manager is locked down by default so that remote applications cannot simply connect in and do damage (e.g. delete important messages from other applications!). There are a number of posts on here that describe these errors and their solutions. Best advise, get the MQRC code (4-digits) and the AMQERR01.LOG error message from the queue manager. Armed with this information you should be able to describe and diagnose any error situations you encounter.
I have been using a Mosquitto Broker for a while and I'm able to bridge two brokers by using the bridge functionally in Mosquitto.
My question is, is it possible to bridge two brokers where I need to connect from Mosquitto to the other broker by using Websockets?
It seems that Mosquitto tries to connect to the other end of the bridge by using only regular MQTT TCP/IP connection and I can't find an option in the CONFIG file to allow for Websockets in the bridge configuration.
I'm getting a "Socket Error" because the other end only supports Websockets.
No, bridging only works when using native MQTT over TCP not Websockets
You are correct, websockets with mosquitto is only supported for incoming connections.
I'm experimenting with mqttjs and websockets and I wish to be able to send messages from a webpage using websockets without a bridge to an MQTT broker that is run by mqttjs. I can't find any information if this is available or even possible.
I've looked at mosquitto and they have "experimental" websocket support and I would love to find a Node.JS MQTT broker which could offer the same.
Thus far I got the communication working with pywebsocket and Socket.IO. I would really appreciate pointers in any direction if it is possible to use websockets to mqtt without bridging.
Thanks.
Is old question but is good to share my findings.
You can use the mosca broker that is written in node.js and is using mqtt.js
The mosca is supporting classic mqtt connection and mqtt over WS :
MQTT-over-Websockets
Mosca can operate in two modes: Standalone and as a node.js module.
In general mosca can support many types of brokers:
Mosca-advanced-usage
HiveMQ supports native websockets, which means you can use any Javascript MQTT library (like Eclipse Paho.js with websockets. It's perfectly possible to connect some clients vie websockets and other clients via standard TCP connection. The websocket support is stable and used in production.
The only drawback for you could be that HiveMQ is not written in Node.JS.
Disclosure: I am one of the developers of HiveMQ.
I used IBM MQs on my local machine to connect to a remote IBM MQ Queue Manager on a client machine for sending and receiving messages.
Due to some issues I need to uninstall IBM MQs on my end.
Can I connect to the client remote queue manager using Apache ActiveMQ? (With SSL)
If possible please guide me how to proceed with it.
If not please suggest any alternative solutions to connect.
No. Connect to it using the WebSphere MQ Client. It is freely downloadable as SupportPac MQC75 and includes support for several languages, including C and Java. Rather than just grabbing the jar files, please install the entire client distribution. IBM includes a number of diagnostic utilities, tracing and so forth in that distribution. These make debugging much easier and IBM requires them to be installed if you open a support ticket. Since the client is free, requiring the diagnostic tools to be installed seems reasonable.
The documentation for the client is here.
Active MQ uses a different wire protocol and its client won't work with WebSphere MQ.