|In my lights project,
I am using several
Yeelight Wi-Fi smart bulbs and several BLE
trackers as switches to these bulbs. In
order to work, all of these must have some
kind of connectivity, so it is not hard to
imagine that something fails, when one
device is powered down, rebooted or simple
power failure occurs. I spent a lot of time
trying to make them work again - the thing
is that these devices work great when all
components are working, but when one device
fails, it is not a simple matter of turning
it back on and it connects and continues
working. Often it works, but sometimes it
just refuses to connect. That's why this
small "manual" on what to do, so you don't
have to spend time trying all combinations
and pulling your hair out on failure.
start with Yeelights. For Yeelights, the
most important thing is Wi-Fi connectivity.
Once you connect them, they'll work. There
could be problems on devices discovery, so
here are a few tips how to connect them.
* Make sure your devices are on the same
network. Meaning not just same VLAN, but
same SSID and frequency. These devices
connect to 2.4Mhz band on your Wi-Fi router,
so if your router has dual 2.4Mhz and 5Mhz
bands, make sure all involved devices are on
the same band. Not that if they're not it
will not work! Sometimes it works, but then,
sometimes it doesn't. So just to be on the
safe side, connect all your bulbs, tablets,
phones, etc to the same SSID and same band.
* Also, turn off (if you have it set) MAC
address filtering, and
* Make your SSID visible.
* If connection fails, test the connectivity
to the servers the bulbs are trying to
connect to. The server Yeelights are
connecting to is ot.io.mi.com (China
server) or sg.ot.io.mi.com
(Singapore server), so make sure your DNS is
translating this and try pinging the server
from your PC. for DNS problems, try using
manual DNS assignment to 18.104.22.168 (Google's
* Once your bulbs are connected, go to your
router and assign them static IP addresses.
Some routers call this "IP reservation".
That means that your bulbs will always be
recognized by their MAC addresses and will
always get the same IP address.
if everything is working - great. but what
if a power failure happens? It is very
probable (if you have several Yeelight
devices) that at least one device will fail.
And even if you make it work again, after
playing with settings for 30 minutes, the
chance is that you will break something
else! Trust me! :) So the best way to
restore full functionality is to do it in
* Turn off your router
* Turn off all your Yeelights
* Turn on the router and wait like 1 minute
* Turn on all your Yeelights, one at a time
* Wait couple of minutes
* Run Yeelight app to check if all
bulbs/light sources are visible
* If not, wait a bit and refresh the list of
This will guarantee that you will have your
lights system up and running in a couple of
minutes. Happened to me like 3-4 times and
worked every time.
as I wrote in my other article about using BLE trackers
as light switches
, these work great, but
again - if the connectivity breaks, you will run
into problems. I spent like 30 minutes trying to
get it to work again after my son messed something
up with the tablet. This is the correct procedure:
* Turn off all your BLE trackers (long press
until it beeps)
* Run iTracing2. It will already be active
in your notification area. There you will
have a list of all the BLE devices.
* Untick one by one
* Tick one device
* Press on the device, screen with range
* Turn on your BLE device (one at a time)
* In couple of seconds, iTracing2 will find
* Do this for
So as you can see, the trick is not to
restart the phone/tablet, the app or turn
off/on Bluetooth on your device - it is to
untick the devices in iTracing2.
I hope this helps you
and saves you some time if you are using the