The following is from https://flows.nodered.org/flow/05a76b25495eb8fd8d3082343f56c645. Just in case it is removed, keep it here for reference.
See the Jeelink flow for the function to convert the values.
# Temperature sensor - Format:
# 0 1 2 3 4
# -------------------------
# OK 9 56 1 4 156 37 ID = 56 T: 18.0 H: 37 no NewBatt
# OK 9 49 1 4 182 54 ID = 49 T: 20.6 H: 54 no NewBatt
# OK 9 55 129 4 192 56 ID = 55 T: 21.6 H: 56 WITH NewBatt
# OK 9 2 1 4 212 106 ID = 2 T: 23.6 H: -- Channel: 1
# OK 9 2 130 4 225 125 ID = 2 T: 24.9 H: -- Channel: 2
# OK 9 ID XXX XXX XXX XXX
# | | | | | | |
# | | | | | | --- Humidity incl. WeakBatteryFlag
# | | | | | |------ Temp * 10 + 1000 LSB
# | | | | |---------- Temp * 10 + 1000 MSB
# | | | |-------------- Sensor type (1 or 2) +128 if NewBatteryFlag
# | | |----------------- Sensor ID
# | |------------------- fix "9"
# |---------------------- fix "OK"