Black Friday deals eh… Always wanted one, but I’m sticking w/ my Garmin (that the battery life is now close to charging each 2days 
Over the past few days, I’ve been playing around (only in the simulator) and managed to get the communication done. (workout is started on watch)
i also tried reading it from Apple Health, although i’m thinking thats slower (need to write to the phone DB, them app read from the DB - and it doesnt work on ipads which dont have Apple Health - at least for the older ones. i have an iPad mini 2 (2013) )
But as you cam tell from the gif, (look at the timestamp) even on workout mode, I’m getting HR every 5secs ¯_(ツ)_/¯ so I’m not sure if this is cos of simulator and will work on actual device (i dont own one and I dont have the $ to buy one). (im getting ever 5 sec too if reading from Apple Health for the record)
also, even on the simulator (or cos it’s the simulator), i’m still seeing like sub second update on the iphone…
It would have been great if one can simulate a HR and broastcast it as BLE (like heartcast - w/o going thru the phone)