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Servers and Sets can be configured for MQTT Transmission and MQTT Engine
| Note |
|---|
MQTT Engine Server Sets were added in module release v4.0.22 |
Servers
The Servers tab allows you to configure a list of the MQTT Servers that the MQTT Transmission module should connect to.
Multiple MQTT Servers can be configured in MQTT Transmission - often times more than one will be configured to handle fail-over in redundant or geographically distributed systems.
Sets
The Sets tab allows you to configure server sets.
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When a set is referenced by a Transmitter configuration or an MQTT Engine configuration, a single connection to one of the servers in the set will be maintained. The other servers will act as failover in the case that a connection with the first is lost.
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Server sets cannot have common elements meaning that a single MQTT server cannot be in more than one set.
Example
In the configuration below we have setup two server sets - one has two server configurations associated with it and one has three server configurations.
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A single connection is made to the first available server in each set. If this server becomes unavailable, MQTT Transmission will attempt to establish a connection with the next server in the set. If unsuccessful, it will continue to walk through the servers in the set until a connection can be made.
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