* added multi-channel device
* added get and set power state
* added some fixes
* add “this” to call class methods
* create params object before build payload
* typo fixed on “switches” param
* added new test cases
* improved error message
* added more test cases
* added authentication error
* added fix channel number too high
* added region change if wrong
* linting + small fixes
* linting + renamed method
* linting