CrewChief can publish telemetry data to an MQTT broker. It also subscribes to an MQTT topic and will trigger notifications based on messages on that topic. The general idea is to enable live online telemetry analysis.
Enable the telemetry collection by checking 'MQTT Telemetry enabled' and choose a 'MQTT drivername' in the CrewChief options.
A community operated broker is available at github.com/b4mad/racing
and you can access your telemetry at pitwall.b4mad.racing
Detailed settings are available My Documents\CrewChiefV4\mqtt_telemetry.json