I've my own home automation system building using ESP8266, Arduino and 4CH relay module. I call http://192.168.1.21/light/on to turn on the relay connected with Light. In the same pattern, I've a fan connected. I developed an Android app to control those.
I recently bought an Echo Dot and want to connect the existing system with Echo. I'm pretty known with NodeJS, C++, Python, Java, so hopefully it won't be a problem to create anything new.
I need guideline to achive the goal, can you please guide me? And would it be possible to call local URL from Alexa Echo?