I wrote the test for SQL server.
host … port 1434 protocol mssql [instance <name>]
The routine talks via Udp using the microsoft SSRP protocol.
You can specify a name of one instance, to check SQL is running and also that specific instance.
Pls don’t ask me to upload this file using GIT or any other CVS. I don’t know how to do and I haven’t spare time for that.
This is a free lunch, take it as is.
Best regards, Massimo Sala