6m? that is not distance... that is besides!

Are you sure that your modules are OK? Seems too short. Even BT does it better.

From the Annex forum, Francesco (the developer of the Annex WiFi I assume) said that it is possible with the ESP modules. Use of the SLEEP command of the interpreter will put the module to sleep for almost zero current draw. Also Wake up and transmission is fast enough, possible through input trigger (button press etc). Have to try and see how it goes.

Ioannis