registration hangs, commands don't work

[matti]

root@autopi:/home/pi# phevctl --mac=my:mac:lower:case --verbose register

Mitsubishi Outlander PHEV Remote CLI - Designed and coded by Jamie Nuttall 2020
MIT License

Type 'x' then enter to quit.
Registering device
Host : 192.168.8.46
Port : 8080
MAC : my:mac:lower:case
Register C0
30......etc-hex
ECU Version : 0030000000
Register 03
01......etc-hex
Register 15
00.....etc-hex
VIN number : my-vin-number
}1

<<nothing happens, but the car does beep>>

x
Exiting