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"""Minimum idle gap between RF/KISS frame sends (host-side pacing)."""
from __future__ import annotations
import threading
import time
MIN_TX_GAP_SEC = 1.5
_lock = threading.Lock()
_last_tx = 0.0
def tx_pace_before_send() -> None:
"""Sleep until at least MIN_TX_GAP_SEC since the previous send."""
global _last_tx
with _lock:
now = time.monotonic()
wait = MIN_TX_GAP_SEC - (now - _last_tx)
if wait > 0:
time.sleep(wait)
_last_tx = time.monotonic()
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