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#!/usr/bin/env python
#
# 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.
"""
import os
import sys
import time
from pylib import android_commands
PULSE_PERIOD = 20
def main():
while True:
try:
devices = android_commands.GetAttachedDevices()
for device in devices:
android_cmd = android_commands.AndroidCommands(device)
android_cmd.RunShellCommand('touch /sdcard/host_heartbeat')
except:
# Keep the heatbeat running bypassing all errors.
pass
time.sleep(PULSE_PERIOD)
if __name__ == '__main__':
sys.exit(main())
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