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      1 #!/usr/bin/env python
      2 #
      3 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
      4 # Use of this source code is governed by a BSD-style license that can be
      5 # found in the LICENSE file.
      6 
      7 """Sends a heart beat pulse to the currently online Android devices.
      8 This heart beat lets the devices know that they are connected to a host.
      9 """
     10 # pylint: disable=W0702
     11 
     12 import sys
     13 import time
     14 
     15 from pylib import android_commands
     16 from pylib.device import device_utils
     17 
     18 PULSE_PERIOD = 20
     19 
     20 def main():
     21   while True:
     22     try:
     23       devices = android_commands.GetAttachedDevices()
     24       for device_serial in devices:
     25         device_utils.DeviceUtils(device_serial).RunShellCommand(
     26             'touch /sdcard/host_heartbeat')
     27     except:
     28       # Keep the heatbeat running bypassing all errors.
     29       pass
     30     time.sleep(PULSE_PERIOD)
     31 
     32 
     33 if __name__ == '__main__':
     34   sys.exit(main())
     35