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 11 import os 12 import sys 13 import time 14 15 from pylib import android_commands 16 17 PULSE_PERIOD = 20 18 19 def main(): 20 while True: 21 try: 22 devices = android_commands.GetAttachedDevices() 23 for device in devices: 24 android_cmd = android_commands.AndroidCommands(device) 25 android_cmd.RunShellCommand('touch /sdcard/host_heartbeat') 26 except: 27 # Keep the heatbeat running bypassing all errors. 28 pass 29 time.sleep(PULSE_PERIOD) 30 31 32 if __name__ == '__main__': 33 sys.exit(main()) 34
