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There are two common causes for this issue – colliding MQTT Client IDs or colliding Sparkplug Edge Node IDsDescriptors.

Colliding MQTT Client IDs occur when there are two or more MQTT clients connecting to an MQTT broker using the same Client ID. The broker uses the Client ID to identify the client and the current state of the client and therefore this ID must be unique per client and broker.

Colliding Edge Node IDs Descriptors occur when there are two or more Edge Nodes publishing with a topic namespace that does not have a unique combination of Group ID and Edge Node ID. In a Sparkplug compliant system, it is this combination of IDs that identifies the Edge Node and is the 'Sparkplug Edge Node Descriptor'. Every Sparkplug Edge Node Descriptor within a Sparkplug environment must be unique.

Let’s start by confirming the connection status of the Edge Nodes with your Chariot or MQTT Distributor server instance to identify which issue you have.

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