The 4 channel smart relay board is powered by a ESP32 WROOM providing the ability to safely control up to four appliances or devices on a load of 110-250 VAC/7A, 30 VDC/10A depending on your needs.

The other button sends an image as a Signal message. ... This doesn’t fix the security concerns between the ESP32 and the relay system, but at least it keeps it local. Report comment.