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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.device import device_utils | |
16 | |
17 PULSE_PERIOD = 20 | |
18 | |
19 def main(): | |
20 while True: | |
21 try: | |
22 devices = device_utils.DeviceUtils.HealthyDevices() | |
23 for d in devices: | |
24 d.RunShellCommand(['touch', '/sdcard/host_heartbeat'], | |
25 check_return=True) | |
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()) | |
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