can we have BI send an alert with pictures

[Coldair]

and allowing me to trigger a dry contact to open a gate?

 

[TonyR]

The Shelly1-UL Wi-Fi switch has a dry contact and BI can open/close it using an HTTP command ==>> Simple Blue Iris I/O using Shelly1 Wi-Fi Devices
Want wired and not wireless? Consider the Ethernet-connected Shelly Pro 1.

Alert and pictures? See @jaydeel 's write up to send via BI ==>> Send Pushover notifications with pictures and hyperlinks

 

[jaydeel]

Send Pushover notifications with pictures and hyperlinks

and with hyperlinks too - to execute any HTTP command you desire.