MqttUserProperties
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MqttUserProperties =
Record<string,string|string[]>
Defined in: src/io/broker/MqttMessages.ts:20
Multi-valued user-property bag carried alongside an MQTT 5.0
message. Same shape as the underlying mqtt-packet’s
properties.userProperties field — a single key may map to one
value or an array of values (the protocol allows duplicates).
Absent when the broker / client is on MQTT 3.1.1.