How to detect terminal connection to using cdc.py VCP on Pico?

[rmrubin]

I have a VCP project that does not display the CDC output buffer until another CDC read or write is executed after a terminal is connected.

How would I adjust the code below so "omg!" is written to the terminal only after it has connected?

I know this code kills the REPL. I do not want multiple COM ports and the actual code implements button triggered methods to reset and rename main.py to handle related headaches.

Thanks!

import usb.device
from usb.device.cdc import CDCInterface
from time import sleep_ms

cdc = CDCInterface()
cdc.init(timeout=0)
usb.device.get().init(cdc, builtin_driver=False)

# function to wait until a terminal is connected to VCP

cdc.write('omg!'.encode('utf-8'))
while True:
    sleep_ms(1000)