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The Servers tab allows you to configure a list of the MQTT Servers that MQTT Transmission 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.
The Sets tab allows you to configure server sets.
Each set represents a logical grouping of MQTT servers.
When a set is referenced by a Transmitter 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.
Servers will not be prioritized to force a connection to one server if multiple are available.
Server sets cannot have common elements meaning that a single MQTT server cannot be in more than one set.
In the configuration below we have setup two server sets - one has two server configurations associated with it and one has three server configurations.
We have two Transmitter configurations each associated with one of the server sets.
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.