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| Table of Contents |
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Overview
As with all adapters, an existing https://unit040.atlassian.net/wiki/spaces/PUD/pages/280987237/Logic+Simulator#Overview is required.
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Where to find the different Gateway Adapters.
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Where to find
To find the MQTT adapter, go to the Inspector window of a https://unit040.atlassian.net/wiki/spaces/PUD/pages/280987237/Logic+Simulator#Overview component.
This https://unit040.atlassian.net/wiki/spaces/PUD/pages/280987237/Logic+Simulator#Overview can be added under Logic.
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Feature overview
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| Info |
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Only the settings between the lines refer to the MQTT Adapter. |
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QoS | known as | speed | reliability | remarks |
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0 | fire & forget | fast | poor | Messages can get lost in unstable connections. Very suitable for wires local connection |
1 | single handshake | slower | good | No message is lost. Can lead to duplicate messages. but is much faster than QoS 2 |
2 | double handshake | slowest | exact | If getting the message exactly once is more important than performance. Quite an overhead compared to the other 2 levels |
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How to use
Please see the https://unit040.atlassian.net/wiki/spaces/PUD/pages/280987237/Logic+Simulator#Overview documentation for further instructions on setting up your simulation.
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Prerequisites for MQTT
MQTT can work with an online broker, but is more commonly used with a local broker. There are a lot of brokers available. An overview can be found at: https://en.wikipedia.org/wiki/Comparison_of_MQTT_implementations
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For testing purposes we recommend using a client like i.e. MQTT.fx https://mqttfx.jensd.de/
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Used Protocol
To communicate with the MQTT adapter in Prespective you need to apply the following protocol:
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Topic to write is the address defined by the PLC address in the signal naming
Value is the value that is within the range of the specified type
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Supported Types
BOOL
BYTE
SBYTE
WORD
DWORD
SHORT
USHORT
INT16
UINT16
INT32
UINT32
INT64
UINT64
REAL32
REAL64
BYTEARRAYSTRING
STRUCT
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Naming Rules
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Setting up the component works as like any other prelogic component. The thing you have to take into account is how the PLC Address Path Format (or implicit naming rule) is configured. The output of this Address is the topic to which the component is reading and/or writing.
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