2016-11-04 10:34:38.872214 10: Packet Receipt Notif Req (Op Code = 8, Value = 0) request sent
2016-11-04 10:34:38.872581 1: Writing to characteristic 00001531-1212-EFDE-1523-785FEABCD123...
2016-11-04 10:34:38.873001 0: peripheral.writeValue(0x03, forCharacteristic: 00001531-1212-EFDE-1523-785FEABCD123, type: WithResponse)
2016-11-04 10:34:38.932434 5: Data written to 00001531-1212-EFDE-1523-785FEABCD123
2016-11-04 10:34:38.932808 10: Uploading firmware...
2016-11-04 10:34:38.932991 1: Sending firmware DFU Packet characteristic...
2016-11-04 10:34:40.169008 5: Data written to 00001531-1212-EFDE-1523-785FEABCD123
2016-11-04 10:34:40.169191 5: Data written to 00001531-1212-EFDE-1523-785FEABCD123

2016-11-04 10:34:40.174397 5: Data written to 00001531-1212-EFDE-1523-785FEABCD123

2016-11-04 10:34:40.174521 20: Writing to characteristic failed
2016-11-04 10:34:40.178467 20: Error 114: Unknown ATT error.
2016-11-04 10:34:40.178620 1: Disconnecting...
2016-11-04 10:34:40.178729 0: centralManager.cancelPeripheralConnection(peripheral)
2016-11-04 10:34:40.725228 0: [Callback] Central Manager did disconnect peripheral without error
2016-11-04 10:34:40.725350 5: Disconnected
2016-11-04 10:34:40.725546 Error 305: Writing to characteristic failed