Finally decided to try and mess with an ESP8266 gateway for the 433Mhz network.
This is the first iteration.
The transistor you see is a 2N7000 mosfet that acts as a 5v to 3.3V TTL level shifter.
Unfortunately it still crashes. I think a lot of power is drawn from the 3.3V pin and it crashes the circuit.
So I will draw all power from the 5V interface and use a voltage divider to bring down the voltage to 3.3V