MQTT and Shelly

I’m brand new to HA and I have +30 Shelly dev. (Mostly Dimmer 2) and would like them to work with MQTT as I have heard it is more stable.

I have set up “Mosquitto broker” it seems to work because I can see my Shelly Dimmer2 test dev. in “MQTT explore” (Shelly is setup to mqtt).

I tried to set up “python script” by adding “python_script:” in /config/configuration.yaml

I created the / config / python_scripts folder and uploaded the file shellies_discovery.py

I have restarted HA 2 times

How do I make sure everything is running and working as it should? (Scripts and Shellies_discovery.py)?

How do I view Shelly MQTT auto discovery devices?

How can I see that a device is imported with MQTT?

I get this but do not know what it means and what to do?:
/config/home-assistant.log

2021-09-30 07:05:54 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration hacs which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant

2021-09-30 07:06:06 WARNING (MainThread) [homeassistant.config_entries] Config entry ‘shellydimmer2-3C6105E32122’ for shelly integration not ready yet: Cannot connect to host 192.168.0.90:80 ssl:default [Connect call failed (‘192.168.0.90’, 80)]; Retrying in background

http://30707077.myds.me:8123/frontend_latest/a4f644cd.js:172:251 Uncaught TypeError: Cannot read properties of undefined (reading ‘item’)
8.35.22 – (FEJL) components/system_log/init.py

Config entry ‘shellydimmer2-3C6105E32122’ for shelly integration not ready yet: Cannot connect to host 192.168.0.90:80 ssl:default [Connect call failed (‘192.168.0.90’, 80)]; Retrying in background
7.42.10 – (ADVARSEL) config_entries.py