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#!/usr/bin/env vpython3
#
# Copyright (c) 2013 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Sends a heart beat pulse to the currently online Android devices.
This heart beat lets the devices know that they are connected to a host.
"""
# pylint: disable=W0702
import sys
import time
import devil_chromium
from devil.android import device_utils
PULSE_PERIOD = 20
def main():
devil_chromium.Initialize()
while True:
try:
devices = device_utils.DeviceUtils.HealthyDevices(denylist=None)
for d in devices:
d.RunShellCommand(['touch', '/sdcard/host_heartbeat'],
check_return=True)
except:
# Keep the heatbeat running bypassing all errors.
pass
time.sleep(PULSE_PERIOD)
if __name__ == '__main__':
sys.exit(main())
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