Does Smart IPTV contain any channels? Where can I get a good playlist?
No, Smart IPTV application does not include any channels and no information will be provided about where you can get channels or channel packages.
My MAC address has changed after I switched to another connection type.
Each TV has 2 MAC addresses (1st is WiFi, 2nd is Ethernet) and a 2nd MAC has activated automatically after you switch to another connection type and restart the app. MAC address is unique for every TV and cannot be changed manually.
I get "Server (URL) connection timeout", "Check playlist URL" or "No playlist uploaded" messages, when starting the app, while my playlist URL that works on my computer, other devices, and apps.
Try example test list http://siptv.eu/lists/example.m3u (external URL) first, then check your playlist for errors. Make sure your URL is a direct link, not a redirect and that it is currently online. You can also try downloading your playlist file by putting the playlist URL in the internet browser address field and use it as a static playlist at My list page.
Additionally, try reducing your playlist size by removing channels/movies (especially if you have LM series LG TV with limited memory). If your playlist doesn't appear on TV or disappears after a restart, try checking to Keep online box, when uploading the playlist. You can also try resetting Smart HUB or turn your TV off and on to clear the TV cache if you have Samsung TV.
TVs have limited memory available for app storage, so if your playlist is too big (~5 Mb), it will fail to save in TV's memory.
Why do I get "Stream failed", "Cannot connect", "Buffering..." messages with my playlist that works on my computer and other devices?
Try example test list http://siptv.eu/lists/example.m3u first, then make sure all your stream links work (not dead) and codecs are supported by your TV. Every TV make and model are totally different and may or may not support specific stream formats: