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DW2 not reliable enough for security.

The DW2 wifi devices are not reliable enough to use for security. It seems like the DW2 only sends a single message when it transitions from open to close or close to open. If this does not make it to the server for some reason then you will never be notified of the transition. You can wait forever and never get the message and if you look at the app it will show the wrong status. This is not a magnet issue since it does not work when going from closed (magnet present) to open where it is a far distance from the magnet. I have verified there is no blinky light indicating wifi connection issue. Also I have either 3 or 4 wifi bars indicated in the app. It seems to me that the server should send an acknowledge back to the device when the state transitions. If the acknowledge is not received within a few seconds the device should try to resend the transition message again until the acknowledge is finally received.


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I bought 4x DW2, but failed to pair them with iOS eWeLink app and android eWeLink app. I got pairing failed (6304).


Would you possible to share some detail of your setup environment?  such as eWeLink version you used?    Android or iOS?   Router Brand? 


Thanks in advance!

Another possibility is that the magnetic sensor gets "stuck"? .  That is that it doesn't open when removed from the magnetic field?  If the magnet field is reapplied and removed then it gets unstuck?  Not sure how I would debug that. 


James,  I did not have that problem.  Make sure that the device is very close to the phone when you try to pair it. I have iOS, not sure the version of the eWelink.   I don't have notice to upgrade it so I think it must be the latest but can't find version on the app or in apple settings.  Do you have the Bluetooth on?  It uses Bluetooth to do the pairing.

James, Also you have to be on a 2.4GHz wifi network, not 5Ghz.  I don't know if this is a problem but I have had problems with other devices with wifi passwords that have special characters.  Maybe try to turn off PW protection on you wifi and try it like that just to see if you can pair.


Thanks Dave.

I had tried few times and also follow some advises @ https://www.reddit.com/r/sonoff/comments/hybwtx/sonoff_dw2_cant_pair/
but no success

after considered all the advice, I finally get it to work with following configuration:

  1. wifi 2.4ghz must configure to Legacy
  2. wifi SSID must contain only a-z (no space)
  3. wifi password must contain number 0-9
  4. wifi channel must set to 6
  5. eWeLink app must have location service permission.

note: do reboot your router after change before pairing

after considered all the advice, I finally get it to work with following configuration:

  1. wifi 2.4ghz must configure to Legacy (b/g protection)
  2. wifi SSID must contain only a-z (no space)
  3. wifi password must contain number 0-9
  4. wifi channel must set to 6
  5. eWeLink app must have location service permission.

James.  Oh yeah now I remember that it was the SSID that had a space that was the problem I had with another device.  I can tell you however I do not have any numbers in my password just combinations of capital and small case letters.  Also I didn't have to do anything with the wifi channel.  I have location services on eWelink set to ASK.


Let me know if you run it to unreliability of reporting open/close status.

I wired a switch across the magnetic sensor and verified that it works, sometimes.  So with no magnet around I switched it several time and it works.  Then I went to the open position and it did not register.  So seems like the communications to the server.  Could be on my end but I have tried reseting the router etc.  If i throw the switch to close of course it does not register because server already thought it was closed.  If I re-open then it will register.  Maybe they are having an issue with their server?  Still seems like a flaw.  They should keep sending a open or close to the server every couple seconds until they get an acknowledge from the server that it has seen the command.  Perhaps they can send a firmware update to improve this. If not I am going to have to find another solution.  Two bad since these were inexpensive and used wifi instead of needing a bridge.


does any UK or US manufacturer make an equivalent?

this sonoff stuff is proving to be very unreliable and pretty mucj useless.

price is not really an option - i just want stuff to work as its supposed to.


Thanks

Hi Tony.  I pretty much gave up on this as it was too unreliable.  It also chewed through batteries pretty quick.  I have had pretty good luck with the Wireless Tag stuff.  Just google it.  You have to have a ethernet bridge so doesn't work directly on wifi.  They sell a reed sensor that works with a magnet.  You can take the magnet out of the big plastic holder or use any other strong magnet you would like.  They use a hall effect chip to sense the magnetic field.  I have figured out how to work around it with a contact closure but haven't actually pulled the trigger on that.  They also sell a Wireless Tag which records temperature and will alarm on motion. It has a door mode which looks for a certain degree opening as well.  You have to set the sensitivity and the higher the sensitivity the power it uses.  I have tried it and it seems okay but a little slower to report then the reed sensor.  They also have a moisture monitor that you can solder wires to and it will detect contact closure.  The down side is that it is sealed and the battery can't be replaced.  THe battery life on all of these seems pretty good.  Also their phone/web interface is VERY good.  You can make each device have a unique sound on your phone, they have temperature charts etc, Emails, Text Messages, works with IFTTT,  can provide emergency text even when in do not disturb on phone (I think).  More expensive but worth it.  They don't have any power switch products, but with IFTTT and Wemo or Kasa you can do it.  IFTTT has just become a little more annoying as they have been free for a long time but decided they need to make $.  You can do up to three thing free but after that you have to pay.  If it is a service you can find then that doesn't count as on of the 3.  For that reason Wemo (I think) might be the better choice.

Hi Tony.


Look into the Wireless Tag products.  Just Google it.  You have to have a Ethernet manager, but battery power and distance seems better.  They also have great phone/Internet interfaces.

Hi Tony,

 

Check out the Wireless Tag products. They require a Ethernet Manager but the battery last longer and the distances are farther. They also have a great Phone/Internet interfaces.

Hi Tony,

Check out the Wireless Tag products.  Just Google Wireless Tag.  They require an Ethernet Manager but the battery lasts longer and the distances are farther.  They also have a great Phone/Internet interface.

They have a Reed Sensor which is magnetic.  You can take out the strong magnet from the plastic housing if you want something smaller, or you can use your own strong magnet.  They use a Hall Effect sensor to detect the magnetic field.  I have figured out how to wire a contact closure around it but have not actually tried it yet.

They also have a Wireless Tag product that detects motion.  It has a door mode so that it has to open so many degrees and it knows what orientation is opened and closed.  You have to set the sensitivity you want and more sensitivity requires more battery power.  I have tried it and it works but the notification delay is a little longer than the reed sensor.

They have a Moisture detector that you can solder wires to and it acts as a contact closure detector.  It has a long probe on it as it is really designed to be put in the grass or planter to detect moisture.  The other downside is that it is a sealed unit and the battery can’t be replaced.  They claim about a 3 year life on it, however.

The Phone/Internet interfaces are excellent.  You can configure each device to give a unique sound.  They can send emails, texts, and can work with IFTTT.  They can also configure to provide emergency notifications on the phone that will (I think) go through even when the phone is in Do Not Disturb mode. Also they provide Temperature charts, a list of events, etc.

They don’t have any Power Switch products but with IFTTT you can use Wemo and KASA devices (Or probably many others).  IFTTT has recently decided it can’t keep providing everything for free and has started to charge if you have more than three recipes.  If you use a provided recipe then it doesn’t count towards your 3.  For that reason Wemo might be a better choice. 

Hope that helps.  Good luck.


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