TTN can in principle also be used for Parametric devices, if you are aware of the following limitations. 

  • An average of 30 seconds uplink time on air, per 24 hours, per device.
  • At most 10 downlink messages per 24 hours, including the ACKs for confirmed uplinks.

See discussion here for more information:

Recommended settings for TCR on TTN

  • Set Interval to 144 min or higher (max. 10 Confirmed Uplinks a day)