Temperamental
Most times the app is started there is no data from the UNC34C graphs do not display any information and charge current and mAh as a result doesn’t display.
About once in 5 attempts the app will displays the UMC34C data. The Bluetooth connection is always ok according to what the iPhones tell you, showing the iPhones and UMC34C are always paired ok, just the app doesn’t always reliably get the data from the UMC34C!