To global_conf.json add the following lines
// Temperature sent as an Integer (true) or as a Floating Point Number (false)
// This was addeed as TTN only accepted Integer values of Temperature, Chirpstack accept Float or Integer
"temperature_integer":true,
// Is there a temperature sensor fitted to the radio module?
"temperature_sensor": true,
// Temperature value only used if "temperature_sensor = false"
"temperature_value": 20.15