With the exception below

6 Apr 19:08:02 - TypeError: Cannot read property 'on' of undefined
at discoveryResult (/home/pi/.node-red/node_modules/am43-ctrl/src/am43.js:117:32)
at /home/pi/.node-red/node_modules/@abandonware/noble/lib/peripheral.js:119:13
at Service. (/home/pi/.node-red/node_modules/@abandonware/noble/lib/service.js:56:7)
at Object.onceWrapper (events.js:421:26)
at Service.emit (events.js:314:20)
at Noble.onCharacteristicsDiscover (/home/pi/.node-red/node_modules/@abandonware/noble/lib/noble.js:398:13)
at NobleBindings.emit (events.js:314:20)
at NobleBindings.onCharacteristicsDiscovered (/home/pi/.node-red/node_modules/@abandonware/noble/lib/hci-socket/bindings.js:368:8)
at Gatt.emit (events.js:314:20)
at Object.callback (/home/pi/.node-red/node_modules/@abandonware/noble/lib/hci-socket/gatt.js:514:12)
at Gatt.onAclStreamData (/home/pi/.node-red/node_modules/@abandonware/noble/lib/hci-socket/gatt.js:133:26)
at AclStream.emit (events.js:326:22)
at AclStream.push (/home/pi/.node-red/node_modules/@abandonware/noble/lib/hci-socket/acl-stream.js:33:10)
at NobleBindings.onAclDataPkt (/home/pi/.node-red/node_modules/@abandonware/noble/lib/hci-socket/bindings.js:288:15)
at Hci.emit (events.js:314:20)
at Hci.onSocketData (/home/pi/.node-red/node_modules/@abandonware/noble/lib/hci-socket/hci.js:495:14)
at BluetoothHciSocket.emit (events.js:314:20)