I have the same problem with some of my switches. If I loose the internet connection for a long period of time, only half of my Sonoff devices will reconnect. The other half will sit doing the double LED flash indefinitely, until I turn the power off, then back on to the SonOff.
It would make sense to me that the Sonoff devices should continue looking for the wifi connection to be restored permanently, and should not stop trying to re-connect after a few minutes
From another post, but probably the same issue?
This is a DHCP issue, and therefore an IP implementation issue in the Sonoff devices. This should be followed up by the manufacturer, but maybe could be worked around. After my reconfiguration, I tried several power resets and the Sonoff devices always rejoin the WiFi
My observations from today - without any network sniffing - that should be for the manufacturer to follow up on. Just a few hours of testing, so I will respond with any further observations, if any. My last problem was after a thunderstorm, so I can’t predict if I will get any issues in the future.
Symptoms: Sonoff RF relay and Sonoff RF Bridge were successfully added to eWeLink and worked OK until a power outage, then they would not reconnect to WiFi. Checking the MAC addresses of all my devices in the DHCP table of the router, the Sonoff devices were not there
Assumption (intelligent guess): During the registration process, the Sonoff devices successfully use DHCP to gain their IP addresses, but then are unsuccessful following a network disconnect (or fail to attempt DHCP). If the router is reset, devices will reconnect using DHCP and a different device will be allocated the IP address that the Sonoff was using. If the Sonoff continues to use the old IP address, it will not be able to reconnect to the server.
Tests and my solution:
- Set the address range of the DHCP server in the router to (perhaps) 10 to 100 (typically I reserve some lower addresses for important PCs and servers)
- Reboot the router to clear all tables
- Identify the MAC address and IP address of the Sonoff device. To achieve this I had to delete the device in eWeLink, then add the device again (using Compatible Pairing Mode – directly connecting using WiFi). Once correctly registered, I could see the MAC address appear in the DHCP table of the router (make a list of existing devices so that you can see the new one appear).
- Add a fixed entry to the router DHCP table for the MAC address and IP address of the Sonoff device
- Change the address range of the DHCP server to (perhaps) 20 to 100 (assuming the Sonoff device is appearing between 10 and 20)
- NOTE: one weird observation is that I had entries in the DHCP table for a MAC address of “all zero” for the same number of devices as Sonoff devices, each reserving an IP address. So I had 2 Sonoff, plus 2 “all zero”, so I would leave a gap in the DHCP table of at least 4, in case these “all zero” entries have some significance
this helps someone, and add feedback if it did / did not. The only way to fix
things is to add feedback
Hi, We have same problem. Some Sonoff basic (1 channel) lost wi fi connections, and only solutions is go to the site and resete Sonoff and inmediately works ok. Is there any solutions for this issue ?. Thanks.
Good morning, The problem is not in eWelink software, as I have two sonoff Touch US one with firmware 3.0.0 that loses the connection and crashes and the other with firmware 2.6.1 and works great. Is it possible to revert the firmware update?
As far as I know, the firmware cannot be to downgrade.
static IP is not the solution. No idea why it would be based on the way the communication goes.
anyways, all my SONOFF have a static IP. they work well, suddenly, they disconnect from WIFI connexion (1 meter from the internet box), they will NOT reconnect automatically.
They do NOT appear anymore in my internet box, the blue light is blinking fast 3 times, then 1 time slow, and it repeats that cycle forever..
I have to re-appair, then it works, a few minutes, then it does not work anymore after a few minutes.
it's definitely on 2.4Ghz, no 5 enabled.
THe firmware was 1.6 (!) and being migrated to 3.3, but does not help.
I have only 1 SONOFF that NEVER disconnect (it has 3.0).
i'm wondering about upgrading this one to 3.3 to see if that's firmware issue.
any other ideas?
update: it's not 3 fast blue blinking+1 slow. it's 2 blue fast + 1 slow. in other words each third blinking is slow :-) . That's a SONOFF T1 (switch in the wall)
The solution is what "Stephen Bunting" said. You need to give it a static ip address from your DHCP server in your router. Be careful to make sure to change the range of the other devices as described by "Stephen Bunting" in a previous comment.
I have been having this issue since I installed 3.0.0 firmware to my Sonoff T1 EU 1C switch.
If I plug off my Wi-Fi on the outlet and plug in again then T1 switch cannot reconnect to my Wi-Fi. I have to delete T1 switch from the ewelink app and pair it again. It is very frustrating.
Could you help someone how can I solve this problem?
My sonoff t1 U.S. with firmware 2.7.1 also disconnect.
Sometimes I open the ewelink app to power on/off the light, but the app shows that sonoff T1 is offline. after about 2 minutes the sonoff reconnects.
The sonoff is about 2 meters of distance of the router.
I've been having this issue for months now and of course, the folks at ITEAD are of no help. Anyway, I spent the last few days experimenting and noticed something that leads me to believe that there are a bad batch of these switches. I am referring to the T1 series of switches - which I have deployed extensively at home. When I turn off my wifi AP and turn it back on, it seems the same few switches do not reconnect. What I have to do is to either delete and re-pair the switch or open the front panel and force a reset. So, there seems to be a bug but when I approached ITEAD, they of course conveniently blamed by network / router.