@garth I am tracking what you are saying about BLE sleep mode and the need to reawaken in that situation. I believe my issue might be slightly different. If I stay next to the node, then the app stays connected b/c I am within range of the device. If I walk out of range of the device and then come back, I have to go into the app and select the node to force the reconnect of the device. If I were to do the same with a Bluetooth speaker or other device, then it would automatically reconnect once I returned within range.
Side note: I noticed the Heltec V3’s coiled bt antenna was horrible. Soldered an appropriate length (2.9cm) straight wire and 10x’d my range.