"""Dump the M5Stack's in-RAM BLE debug ring via USB serial.

Use right after a failed Open BLE attempt — the device's ring holds
recent connect/subscribe/notify events that tell us exactly what its
side of the BLE handshake observed.
"""
import sys

from serial_manager import SerialManager


def main():
    s = SerialManager()
    if not s.scan_and_connect():
        print("[dbg] could not find/connect to M5Stack over USB")
        sys.exit(1)
    print(f"[dbg] connected to {s.port}")
    entries = s.get_ble_log()
    if entries is None:
        print("[dbg] get_ble_log returned None (device may not support it)")
        return
    if not entries:
        print("[dbg] ring is empty")
        return
    print(f"[dbg] {len(entries)} entries:")
    for e in entries:
        t = e.get("t", "?")
        m = e.get("m", "")
        print(f"  [{t:>10}] {m}")


if __name__ == "__main__":
    main()