Joining two GPIO inputs using "Join" node to output a single function

[grawsom]

If I understand correctly you have a RPI on the chair, and another RPI remotely about 75 feet, connected together with TCP.

Maybe take a look at this - Controlling GPIOs on another Raspberry Pi - General - Node-RED Forum
you can use HTTP in/out, MQTT or maybe use the "remote GPIO", and then on device 2 use a function node with an IF statement that checks if "switch on chair" is activated.
Just an idea - I myself will check out the GPIO stuff.