Connect to open WiFi network (without password)

skhell

Hi,

I have a couple of Shelly 3EM devices that I would like to connect to a open WiFi network (without password). Although the devices allows leave the password blank, it refuses to connect. The log files show the following messages:

Code

285641856 mgos_wifi_sta.c:467     Starting scan
288277426 esp_main.c:137          SDK: scandone
288282776 mgos_wifi_sta.c:345     WiFi scan result: 23 entries
288285330 mgos_wifi_sta.c:397     AP queue:
288288065 mgos_wifi_sta.c:400       0: SSID: FWUE                            , BSSID: 00:00:00:00:00:00 RSSI 0 cfg 0 att 2
288292314 mgos_wifi_sta.c:542     Trying FWUE AP 00:00:00:00:00:00 RSSI 0 cfg 0 att 3
288299296 mgos_net.c:86           WiFi STA: connecting
290965184 esp_main.c:137          SDK: scandone
290968460 esp_main.c:137          SDK: sleep enable,type: 2
290971926 mgos_wifi.c:69          WiFi STA: Disconnected, reason: 201
290974391 mgos_wifi_sta.c:565     Connect failed
290977892 mgos_net.c:82           WiFi STA: disconnected
292977588 mgos_wifi_sta.c:525     No candidate APs

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After some digging, reason 201 is because the client is sending the password for a network without password.

Is there any way to solve this problem?

rallyecom

With open network, the shellys don´t try to connect to the cloud. Sometimes they don´t connect to the network. Its a security feature - remember, in a open network EVERYBODY can switch your shellys, that is not a good idea...

Most WIFI routers and APs can handle 2 or more different WIFI networks, e.g. home and guest oder in commercial environment for different workgroups. Try to set a secured WIFI for your automations...

peksi

I ran to this very same problem, and finally found a solution for it.

The key is to send NULL character along the key parameter. This can be done by setting the parameter with value %00, i.e., key=%00

Below is an example utilizing cURL, with POST method, switch -d is for application/x-www-form-urlencoded. Notes:

[] is optional, in the case you have set basic auth for the device
<> you need to set your own information in this space

Code

curl [--user youruser:yourpassword] -X POST -d 'ssid=<YOUR-SSID>&ipv4_method=dhcp&enabled=1&key=%00' http://<SHELLY-IP>/settings/sta

Connect to open WiFi network (without password)

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