So I did a thing, and purchased the Nightwatch Smart Halter for a 6 month period ($79 per month).
Things I like:
*easy to read screen
*tracking heart rate, respiration and activity level very straightforward
*you can set your own alert levels (for example, heart rate over 50)
*customer service is actually fantastic
Things I don’t like:
*took me the better part of a day to get it to sync with my barn wifi
*an LTE or 4G plan isn’t available yet, which means you have to have your horse within a wifi signal area
*battery lasts about 8 hours, which means it doesn’t work all day, and it won’t work all night - ETA … battery supposed to last 12 hours and may have been draining faster because of challenge in connecting to WIFI - will revisit this
*takes a few hours to recharge
Is anyone having a better time making it useful to them? FWIW I do have a farm camera system, but it would be great to be alerted when I need to look.