Device reboot requires explicit sleep even after "adb wait-for-device"

[reddypdl]

Code:

self.d.server.adb.raw_cmd("root").communicate()
subprocess.Popen('adb nodaemon wait-for-device'.split(), stdout=subprocess.PIPE).communicate()
self.d.server.adb.raw_cmd("reboot").communicate()
subprocess.Popen('adb nodaemon wait-for-device'.split(), stdout=subprocess.PIPE).communicate()
#time.sleep(10)
self.d(packageName="android").wait.exists(timeout=9000)

Error:

Traceback (most recent call last):
File "test_reboot.py", line 34, in testMultiReboot
self.reboot()
File "test_reboot.py", line 28, in reboot
self.d(packageName="android").wait.exists(timeout=9000)
File "/home/git/work/uiautomator/uiautomator.py", line 397, in call
return AutomatorDeviceObject(self, Selector(**kwargs))
File "/home/git/work/uiautomator/uiautomator.py", line 809, in init
super(AutomatorDeviceObject, self).init(device, selector)
File "/home/git/work/uiautomator/uiautomator.py", line 637, in init
self.jsonrpc = device.server.jsonrpc
File "/home/git/work/uiautomator/uiautomator.py", line 319, in jsonrpc
self.start()
File "/home/git/work/uiautomator/uiautomator.py", line 337, in start
raise IOError("RPC server not started!")
IOError: RPC server not started!

But after un-commenting time.sleep(), i do not see this issue, Does RPC server start after few seconds after reboot?

[xiaocong]

Likely something wrong during starting rpc server. Maybe the uiautomator service is not yet started even if the adb is ok. I am trying to reproduce it.

Thanks for your issue.

[xiaocong]

During android device booting, there are dozen of seconds that the adb is ok but android service in android device is not running, so I am afraid I could not fix the issue.
As a workaround, you can write test:

timeout = 15
while not d.server.alive and timeout > 0:
    sleep(1)
    timeout -= 1
    try:
        d.server.start()
    except:
        pass