I also met the same problem a few days ago , but now it was resolved, I didn't change anything, they just work well suddenly.

I'm afraid not support such command. You can check on TP-Link which command is useful : http://www.tp-link.com/en/faq-1356.html

Have better ask Amazon for support.

For your Roku router I think you have better enable the Ping Watch Dog to reboot device automatically. Regrading the HS105 after power failure it should be the same of unplug and plug again so I...

Can your smartphone be assigned with IP address when you connect to the plug? Have you tried with another phone?

Not sure what issue you meet. How about posting the screenshot of the step? Anyway if I were you I will call support directly.