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MQTT connection via Siemens PLC [message #1860630]

Tue, 22 August 2023 12:40

Florian Lambrecht

Messages: 3
Registered: August 2023

Junior Member

Hey together,

has anyone realised a connection via a Siemens PLC? I'm having trouble to connect to our broker, with the library that Siemens provides.

We've realized it so far with a Beckhoff PLC but Siemens is new to us. I've tried nearly anything to get it going but it won't connect at all.

We're running mqtt in a container on a proxmox server

Thanks so far!

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Re: MQTT connection via Siemens PLC [message #1860662 is a reply to message #1860630]

Thu, 24 August 2023 12:36

Florian Lambrecht

Messages: 3
Registered: August 2023

Junior Member

Some logs:
Aug 24 12:05:58 mosquitto[57]: 1692878758: New connection from [IP-Address]:50874 on port 1883.
Aug 24 12:05:58 mosquitto[57]: 1692878758: New client connected from [IP-Address]:50874 as [ClientIdentifier] (p2, c1, k60).
Aug 24 12:05:59 mosquitto[57]: 1692878759: Bad client [ClientIdentifier] sending multiple CONNECT messages.
Aug 24 12:05:59 mosquitto[57]: 1692878759: Client [ClientIdentifier] disconnected due to protocol error.
Aug 24 12:06:03 mosquitto[57]: 1692878763: New connection from [IP-Address]:50876 on port 1883.
Aug 24 12:06:03 mosquitto[57]: 1692878763: New client connected from [IP-Address]:50876 as [ClientIdentifier] (p2, c1, k60).
Aug 24 12:06:04 mosquitto[57]: 1692878764: Bad client [ClientIdentifier] sending multiple CONNECT messages.
Aug 24 12:06:04 mosquitto[57]: 1692878764: Client [ClientIdentifier] disconnected due to protocol error.
Aug 24 12:06:08 mosquitto[57]: 1692878768: New connection from [IP-Address]:50878 on port 1883.
Aug 24 12:06:08 mosquitto[57]: 1692878768: New client connected from [IP-Address]:50878 as [ClientIdentifier] (p2, c1, k60).

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Re: MQTT connection via Siemens PLC [message #1860750 is a reply to message #1860662]

Thu, 31 August 2023 13:30

Gambit Support

Messages: 46
Registered: March 2019

Member

Since you have not received any answer, I'll venture one: you need to set the client identifier correctly
in order not to clash with another device with the same client identifier. This is a common problem
connecting devices with MQTT.

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