With a twisted pin on a long-pin socket soldered to a 3-pin right angle socket, it makes a tidy connection to an inexpensive relay module. I soldered a 2-pin header to 0V and 5V on the carrier module to bring power from a usb breakout module.
I connected TX on the ESP module to IN on the relay module. TX is Pin 1, so after PIN.MODE 1,output, PIN(1)=0 turns the relay on, and PIN(1)=1 turns it off.
30A 2-relay combination toggling Tx and Rx alternately on and off: 2-relay program:
Code: [Local Link Removed for Guests]
' GPIO 1 (TX), GPIO 3 (RX)
pin.mode 1,output
pin.mode 3,output
' pin(1)=0 ' turns relay on
do
pin(1)=0
pin(3)=1
pause 500
pin(1)=1
pin(3)=0
pause 500
loop