LoRa is one of the LPWAN communication technologies, and it is an ultra-long-distance wireless transmission scheme based on spread spectrum technology adopted and promoted by Semtech in the United States. This solution changes the previous compromise between transmission distance and power consumption, and provides users with a simple system that can achieve long distance, long battery life, and large capacity, thereby expanding the sensor network. At present, LoRa mainly operates in free frequency bands around the world, including 433/868/915MHz, etc.
