tl;dr: LG 'smart' TV and projector devices want to phone home to get the date and time and this daemon fixes these defective devices.
You just got a fancy new display from LG! Congratulations!
Unfortunately, when you decided to make it behave itself by firewalling it, it stopped automatically updating its time and date. Maybe your display is the amazing HU-80 CineBeam portable 4K laster projector and its time and date get thrown away every time you store it. Or maybe you have a TV on a smart plug. Or maybe your power is intermittent. Or maybe you just never want to have to worry about date and time on a bloody 'smart' display device. It's so nice to just have the YouTube app on the device work properly... so easy. Except Google serves TLS certificates with NotValidBefore set so the YouTube app is unusable until you set the date and time manually. :-( And the device doesn't listen to the NTP server setting that it itself requests via DHCP. :-(
Luckily, no certificate checking is done on the initial phone home request it makes and the server response contains an HTTP header with the current time in milliseconds since the UNIX epoch. Whew!
- Download correct build for your platform.
- Unpack archive (it will create a subdirectory for you) where you want to 'install' the daemon.
cdinto the installation directory and runsudo ./lgtv-sdp -s install BIND_ADDRESSwhereBIND_ADDRESSis the IP you want the daemon to listen on or0.0.0.0or::for all addresses.- Redirect DNS for
*.lgtvsdp.comto an address where the daemon is listening. - Enjoy your LG display with the correct time!
- Ensure go 1.14 is installed.
- Clone this repo.
go buildorGOOS=TARGET_OS GOARCH=TARGET_ARCH go build
The daemon will check if key.pem and cert.pem files are present in
its directory and, if they aren't, will create new certificate
authority (CA) certificate and a domain certificate and sign the
domain certificate with the CA key. The daemon will then start an
HTTPS server on the standard port 443.
The HTTPS server will respond with the contents of initservices.json
with the headers in the files under initservices.headers/ to
requests for any paths. The X-Server-Time header will always be set
to the number of milliseconds since the UNIX epoch. You may be able to
customize more aspects of your device(s) by sending specific headers
or JSON content but none of that is necessary to set the time. Home
screen widgets and further request behavior are both probably
controllable with specific responses. Your contributions are very welcome.
We need:
- A Windows service tester
- LG webOS 4 and 5 testers
- A free world
Patches, documentation, cool features, and more are welcome. Negativity and lawsuits are not welcome.