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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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