LibreELEC:~ # echo 'scan' | cec-client -s -d 1
opening a connection to the CEC adapter...
requesting CEC bus information ...
CEC bus information
===================
device #0: TV
address:       0.0.0.0
active source: no
vendor:        Philips
osd string:    TV
CEC version:   1.4
power status:  on
language:      rum


device #1: Recorder 1
address:       1.2.0.0
active source: no
vendor:        Philips
osd string:    CECTester
CEC version:   1.4
power status:  on
language:      eng


device #4: Playback 1
address:       1.1.0.0
active source: no
vendor:        Toshiba
osd string:    Fire TV Stick
CEC version:   1.4
power status:  standby
language:      ???


device #5: Audio
address:       1.0.0.0
active source: no
vendor:        Unknown
osd string:    Hisense HS512
CEC version:   1.4
power status:  on
language:      ???


currently active source: unknown (-1)