For more information, please read https://stackoverflow.com/questions/2678551/when-should-space-be-encoded-to-plus-or-20.

In the current firmware version, a + in a query string is translated to %20 before the request is being sent. So, your device will receive the query string 1%20PowerOn, which should be interpreted exactly the same as 1+PowerOn.

In the next firmware version, we will no longer translate + to %20 anymore.