# structure/b_frame.py

import struct

B_STAR_TIME_OFFSET = 41  # 根据你协议计算出的星上时偏移（可精调）
B_STAR_TIME_LEN = 6

def build_b_frame(data_id: int, processed_values: list[float]) -> bytes:
    # 每个结果占8字节大端double
    payload = b"".join(struct.pack('>d', v) for v in processed_values)
    data_len = len(payload)
    frame = struct.pack('>II', data_id, data_len) + payload
    return frame