I’ve played around with the Sonoff Basics, Duals and S20s quite a bit. They’re very simple to write code for and work very well.
The T1 is a totally different proposition. If you read this info, you’ll see why:
For me, using the T1 in my homes in either the UK or Spain is a non-starter without making significant changes to the mains wiring of the houses, as I don’t have a Neutral wire available in my light switch fittings, so this switch won’t work.
If I did fancy running Neutral wires to all of the light fittings then programming the T1 is much more complex than the Sonoffs that I’ve worked with previously. From the link above, it appears that the main chip in the T1 is an ESP8285 but that it uses an EFM8BB1 as well, to manage the touch switch interfacing and to store the button status. Reverse engineering the logic for this will be a challenge when writing your own software.
The device does work with the Tasmota firmware, but that doesn’t support Blynk (as far as I can see). You could try using the data from the link above and their Tasmota source code to write your own code, or you could set-up an MQTT server to act as a bridge between Tasmota and Blynk, like this:
The T1 also uses 433MHz wireless communication, so another option is to create a two-way 433/Blynk bridge device to control it.
Hope this helps,
Pete.