infinitude | Open control of Carrier/Bryant thermostats

This depends entirely on how your responses are structured. There are a few ways to approach this:

• Create an enum representing your responses, generic to the success (and perhaps failure) value. Something like APIResponse, which is itself Decodable and will try to parse the success value or an error from the response. This would allow you to keep using responseDecodable but you'll have to rectify response errors with request errors produced by Alamofire yourself.
• Create your own ResponseSerializer that knows how to decode success and failure values, which can you hook into Alamofire's response method.
• Relatedly, you can extend DataRequest with a custom response method that uses your custom serializer.