I could compile the NTAG 5 iOS development source code without any error. I could run the app and NFC card detection without any problem. However, the GetAccelXI2CMaster function is always return 0 byte length as below. Secondly, I could not locate the "I2CMasterLogs.txt" inside the iPhone 11 with iOS 13.5.
2020-05-27 21:51:44.127933+0800 NTAG5 I2C Active[3065:934551] Waiting for connection...
2020-05-27 21:51:44.162658+0800 NTAG5 I2C Active[3065:934687] Tag Reader Session Did Become Active response: <NFCTagReaderSession: 0x280849300>
2020-05-27 21:51:46.541651+0800 NTAG5 I2C Active[3065:934687] -->Tag Detected on Field
2020-05-27 21:51:46.541715+0800 NTAG5 I2C Active[3065:934687] -->MIFARE Tag Tyoe:1
2020-05-27 21:51:46.541733+0800 NTAG5 I2C Active[3065:934687] -->Connecting to Tag!
2020-05-27 21:51:46.550599+0800 NTAG5 I2C Active[3065:934687] -->Connected!
2020-05-27 21:51:46.550630+0800 NTAG5 I2C Active[3065:934551] Connected!!!
2020-05-27 21:51:46.550865+0800 NTAG5 I2C Active[3065:934687] [CoreNFC] 00000002 80849300 -[NFCTagReaderSession setAlertMessage:]:92 (null)
2020-05-27 21:51:46.550899+0800 NTAG5 I2C Active[3065:934687] -->Is tag Available?
2020-05-27 21:51:46.551645+0800 NTAG5 I2C Active[3065:934685] Custom Command: 12D49F0001 --> response: {length = 0, bytes = 0x}
2020-05-27 21:51:46.551711+0800 NTAG5 I2C Active[3065:934685] Custom Command Bytes:
2020-05-27 21:51:46.551728+0800 NTAG5 I2C Active[3065:934685] Sent Sucess
2020-05-27 21:51:46.551748+0800 NTAG5 I2C Active[3065:934685] [CoreNFC] 00000002 828dc780 -[NFCISO15693Tag customCommandWithRequestFlag:customCommandCode:customRequestParameters:completionHandler:]:4 Custom command code must be between 0xA0 to 0xDF inclusively
2020-05-27 21:51:46.551769+0800 NTAG5 I2C Active[3065:934685] Custom Command: 12D51F00 --> response: {length = 0, bytes = 0x}
2020-05-27 21:51:46.551795+0800 NTAG5 I2C Active[3065:934685] Custom Command Bytes:
2020-05-27 21:51:46.551862+0800 NTAG5 I2C Active[3065:934691] Custom Command: 12D20006 --> response: {length = 0, bytes = 0x}
2020-05-27 21:51:46.551890+0800 NTAG5 I2C Active[3065:934691] Custom Command Bytes:
2020-05-27 21:51:46.551799+0800 NTAG5 I2C Active[3065:934686] Custom Command: 12D41F012A0D --> response: {length = 0, bytes = 0x}
2020-05-27 21:51:46.551957+0800 NTAG5 I2C Active[3065:934691] Read Data
2020-05-27 21:51:46.552071+0800 NTAG5 I2C Active[3065:934685] [CoreNFC] 00000002 828dc780 -[NFCISO15693Tag customCommandWithRequestFlag:customCommandCode:customRequestParameters:completionHandler:]:4 Custom command code must be between 0xA0 to 0xDF inclusively
2020-05-27 21:51:46.552353+0800 NTAG5 I2C Active[3065:934686] Custom Command Bytes:
2020-05-27 21:51:46.552462+0800 NTAG5 I2C Active[3065:934691] [CoreNFC] 00000002 80849300 -[NFCTagReaderSession setAlertMessage:]:92 (null)
2020-05-27 21:51:46.552730+0800 NTAG5 I2C Active[3065:934686] [CoreNFC] 00000002 828dc780 -[NFCISO15693Tag customCommandWithRequestFlag:customCommandCode:customRequestParameters:completionHandler:]:4 Custom command code must be between 0xA0 to 0xDF inclusively
2020-05-27 21:51:46.552778+0800 NTAG5 I2C Active[3065:934777] Tag Reader Session Status: Invalidated, Error Domain=NFCError Code=200 "Session invalidated by user" UserInfo={NSLocalizedDescription=Session invalidated by user}
2020-05-27 21:51:46.552954+0800 NTAG5 I2C Active[3065:934691] [CoreNFC] 00000002 828dc780 -[NFCISO15693Tag customCommandWithRequestFlag:customCommandCode:customRequestParameters:completionHandler:]:4 Custom command code must be between 0xA0 to 0xDF inclusively
2020-05-27 21:51:46.559414+0800 NTAG5 I2C Active[3065:934687] -->Yes, It is!
2020-05-27 21:51:46.566307+0800 NTAG5 I2C Active[3065:934690] Select Command sent
2020-05-27 21:51:46.566322+0800 NTAG5 I2C Active[3065:934687] Custom Command: 12D41F012A00 --> response: {length = 0, bytes = 0x}
2020-05-27 21:51:46.566339+0800 NTAG5 I2C Active[3065:934690] Select Command sent
2020-05-27 21:51:46.566358+0800 NTAG5 I2C Active[3065:934690] Custom Command: 12D41F015B1F --> response: {length = 0, bytes = 0x}
2020-05-27 21:51:46.566371+0800 NTAG5 I2C Active[3065:934686] Custom Command: 12D41F015C20 --> response: {length = 0, bytes = 0x}
2020-05-27 21:51:46.566390+0800 NTAG5 I2C Active[3065:934687] Custom Command Bytes:
2020-05-27 21:51:46.566396+0800 NTAG5 I2C Active[3065:934686] Custom Command Bytes:
2020-05-27 21:51:46.566379+0800 NTAG5 I2C Active[3065:934691] Select Command sent
2020-05-27 21:51:46.566407+0800 NTAG5 I2C Active[3065:934687] Select Command sent
2020-05-27 21:51:46.566403+0800 NTAG5 I2C Active[3065:934777] Select Command sent
2020-05-27 21:51:46.566414+0800 NTAG5 I2C Active[3065:934686] Select Command sent
2020-05-27 21:51:46.566380+0800 NTAG5 I2C Active[3065:934690] Custom Command Bytes:
2020-05-27 21:51:46.566428+0800 NTAG5 I2C Active[3065:934685] Select Command sent
