Yes, it should be present at the Edge under the MQTT Transmission tag provider. My apologies… the example tag path I replied with got mangled by the forum formatter. Please see the new example tag path below. Please note that the Transmitter name, Group Id and Edgenode Id will be specific to your Transmitter configuration. Let me know if you have trouble finding the corresponding tag for your Transmitter following the example below.
[MQTT Transmission]Transmission Info/Transmitters/TransmitterName/Edge Nodes/GroupId/EdgeId/MQTT Client/Online