1. Basic Information

1.1 UUID

Type	UUID
Service	8FE4E987-0824-8B2C-2E59-22C7287395C3
Host to Device	8FE4E988-0824-8B2C-2E59-22C7287395C3
Device to Host	8FE4E989-0824-8B2C-2E59-22C7287395C3

1.2 MAC Address

First 24 bits are fixed: 50:C0:F0
Last 24 bits are random

1.3 Advertising Packet

Type	Data	Description
0x01	0x06	Advertising flag
0x09	C01	Device name
0x02	16-bit UUID	First two bytes of the 128-bit UUID: `8FE4`
0xFF	MAC	Device MAC address

1.4 About iOS

After pairing with the iOS system, due to the presence of the ANCS protocol, iOS will maintain the BLE central connection even after the app is closed and removed from the background.

1.5 About the Bike Computer

To be compatible with the bike computer, the data sent from the device to the app must not exceed 17 bytes per transmission. If the data exceeds this limit, it will be split into multiple packets.

1. Basic Information

1.1 UUID

1.2 MAC Address

1.3 Advertising Packet

1.4 About iOS

1.5 About the Bike Computer

2. Protocol Format

2.1 Protocol Structure