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[BroHogan]

For those who can work with Arduino (ESP8266) Here is a way to control X10 (CM17A) with Alexa.
brohogan.blogspot.com/search/label/Alexa (can't post links!)

[HA Dave]

For those who can work with Arduino (ESP8266) Here is a way to control X10 (CM17A) with Alexa.
brohogan.blogspot.com/search/label/Alexa (can't post links!)

An Arduino with a serial port?

[dhouston]

An Arduino with a serial port?

https://www.arduino.cc/reference/en/language/functions/communication/serial/

[BroHogan]

Yes, the Arduino has a serial port, but it is not used for the CM17A. The CM17A uses the RTS and DTR lines for input.

[dhouston]

To clarify, you're not using an Arduino+ESP8266 but an ESP8266 on its own.

[BroHogan]

Yup, just the ESP (which also has a Serial port). Sorry about using "Arduino" to describe this. (I use the Arduino IDE to program the ESP.)

[dhouston]

I understood but many of the other my fellow dotards here possibly did not.

Should there be an API for the WM100 (X10 WiFi unit) an Arduino+ESP8266, standalone ESP8266 or RPi might all be able to communicate with it.