Actually it is dead easy to have the APP and Node-Red update or get data from multiple devices - I’m doing it right now. Info comes in from node from the APP, put it through a function - to MQTT… also for example - I press a button on the APP, that causes an MQTT request from my battery monitor. Info comes in from MQTT in Node-Red on battery voltage - I send that back to the APP to a gauge - which then shows the battery voltage. With Node-Red in charge the APP can talk to just about anything! I’m blogging about this right now - later today…