Hi Toriq,
I love Yatse, but maybe I have a “problem” that more users have: I still need to switch on the TV and/ or amplifier with another remote (or worse: walk to the device and switch it on manually!)…
quite some devices that can run Yatse have IR balser: https://en.wikipedia.org/wiki/List_of_devices_with_an_IR_blaster
Would it be possible/ usefull to have some basic IR functions in Yatse to switch on the TV and/or amplifier?
The problem is not the IR function it’s the code database 
90% of Android devices with IR blaster only works one way so can’t be used to learn codes. Meaning without a full proper IR code database it’s quite complicated to propose something end user ready.
Ok. Clear. I thought it would be less complicated and more standardised. …
Pffff. Then I will continue to walk to the amplifier to switch it on. I refuse to install an ugly app next to Yatse just to power it up! Is that what you call a power walk? 
What device and android version do you have? And is your device you want to control somewhere on that site: http://www.remotecentral.com/ with pronto codes ?
Samsung s4 mini. Android 4.4.4, simple sony home cinema dav- dz330, but with hifiberry dac + (so volume control is already covered in yatse )
No need for all functions. Only power on/off, so iirc any dav-dv remote will work for the power function.
(I mainly use kodi for playing alac/ flac music)
If I ever do something there won’t be any pre filled code 
So please take time to check if you can find codes for your device and in what format.
I think I see quite some codes in various formats on http://irdb.tk/db/ for Sony DVD players, but I have no idea how to test them
I think this app: https://play.google.com/store/apps/details?id=de.harrygr.rcoid permit to create buttons with codes.
I have not yet really do any tests for that yet
Ok this is really insane. 
So many IR remote controlled devices in every home, and so little good documentation.
I found an official Sony remote IR app: my DAV-DZ330 is not listed my sony tv is listed, so I will try the app later this week. https://play.google.com/store/apps/details?id=com.sony.tvsideview.phone&rdid=com.sony.tvsideview.phone
alternative route: work back from the sony remotes (they have their own product codes):
I found that the remote RM-ADU078 (ean 8006023442805) is compatible with RM-ADU138 (ean 7091231774344), so maybe that will give me some other sony DVD /theatre devices that have listed IR codes…
You start to understand why I did not want to touch this insanity and will never be able to provide code database for users 
Aaaaaaaaaaaaaarrgggggggghhhhhhhh!!!
The sony remote app doesn’t seem to work with my devices. It wants to know the ip numbers, but my devices are older and IR only 
Tried to play a little today, but I’m not able to find any codes for any of my devices
I found a work-around: I explained/ instructed the kids how to switch on my amplifier
I propose to close this feature request to prevent further headaches…
@msxbas your devices does not support CEC?
I had the same issue. After some hours of thinking and configuration (trial and error) I found the perfect setup with CEC (via amp, TV set, Kodi on Odroid) and Yatse.
Imagine, my TV set and amp are off. When my boy opens Yatse, found a TV show and hits the play button → all the devices and the movie are starting directly and the boy enjoys the show.
Thanks for the reply eusi, I will investigate the CEC standards, although there is no direct HDMI connection between Kodi and the home Cinema (DAC audio comes through a mini-jack line-in connection).
Both kodi and home Cinema are connected with HDMI to the TV, but I am not sure if my current Libreelec supports audio on both HDMI AND DAC simultaneously…