KC868 server16 and GSM module

[admin]

do you use by ESPHome?

[Rupesh]

Isn't the GSM module on the Server16 connected directly to the Compute Module (CM4) via USB? I assume that means we should be using the native Home Assistant SMS integration or Shell Commands pointing to the serial port, rather than ESPHome.
Beautifulideas.in
@admin, could you clarify if we need to release the serial port from the OS first, or can we just point Home Assistant directly to /dev/ttyUSB?

[admin]

Server16 4G sim7600 module rxd,txd pin use by CM4's gpio directly, there are GPIO12, GPIO13. here is CM4 pin define: https://www.kincony.com/forum/showthread.php?tid=5418
we already have node red demo for that. just send AT command by these two gpios.