problem!....The lora device does not receive data

[LoRaTracker]

For TTN limits see here;

https://www.thethingsnetwork.org/forum/t/limitations-data-rate-packet-size-30-seconds-uplink-and-10-messages-downlink-per-day-fair-access-policy-guidelines/1300

For the legal restrictions you would need to read up the regulations affecting your part of the World. Its often 1% duty cycle limit, though.