Big Data

Service: de5bf728-d711-4e47-af26-65e3012a5dc7
Write Characteristic (Requests): de5bf72a-d711-4e47-af26-65e3012a5dc7
Notify Characteristic (Responses): de5bf729-d711-4e47-af26-65e3012a5dc7

This is a newer protocol compared to Commands.

These will contain the following structure:

struct BigDataResponse {
    uint8_t bigDataMagic = 188;
    uint8_t dataId;
    uint16_t dataLen;
    uint16_t crc16;
    // Variable data length
}

For requests, the variable data will be empty, so set dataLen to 0 and crc16 to UINT16_MAX.

struct BigDataRequest {
    uint8_t bigDataMagic = 188;
    uint8_t dataId;
    uint16_t dataLen = 0;
    uint16_t crc16 = 0xFFFF;
}

TODO: There's more Big Data types

Sleep

ID: 39

struct SleepData {
    uint8_t bigDataMagic = 188;
    uint8_t sleepId = 39;
    uint16_t dataLen;
    uint16_t crc16;
    uint8_t sleepDays;
    SleepDay days[];
}

struct SleepDay {
    uint8_t daysAgo;
    uint8_t curDayBytes;
    int16_t sleepStart; // Minutes after midnight
    int16_t sleepEnd; // Minutes after midnight
    SleepPeriod sleepPeriods[];
}

struct SleepPeriod {
    SleepType type;
    uint8_t minutes;
}

enum SleepType : uint8_t {
    NODATA = 0,
    ERROR = 1,
    LIGHT = 2,
    DEEP = 3,
    AWAKE = 5,
}

Blood Oxygen

ID: 42

struct BloodOxygenData {
    uint8_t bigDataMagic = 188;
    uint8_t sleepId = 42;
    uint16_t dataLen;
    uint16_t crc16;
    uint8_t unk;
    uint8_t daysAgo;
    BloodOxygenSample samples[];
}

struct BloodOxygenSample {
    uint8_t min;
    uint8_t max;
}