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MJ_HT_V1.sh

#!/bin/bash

# sudo hcitool lescan
MAC="4C:65:A8:D?:??:??"

while :; do
  HT=$(timeout 20 gatttool -b $MAC --char-write-req --handle=0x10 -n 0100 --listen | grep -m1 "Notification handle")
  (($? == 0)) && break
  sleep 5
done

while :; do
  B=$(gatttool -b $MAC --char-read --handle=0x18)
  (($? == 0)) && break
  sleep 5
done

THB=($(
  echo ${HT} | cut -d: -f2 | xxd -p -r | tr -c '[0-9.]' ' '
  printf "%d\n" 0x$(echo ${B} | cut -d: -f2 | tr -d ' ')
))

if ((${#THB[@]} == 3)); then
  # {"timestamp":1706283589,"temperature":5.6,"humidity":63.6,"battery":79}
  jq -n -c --argjson temperature ${THB[0]} --argjson humidity ${THB[1]} --argjson battery ${THB[2]} '{timestamp: (now|floor), $temperature, $humidity, $battery}'
fi