esp_phy_ble_tx() function

Transmit power level. Tx power is about (level-8)*3 dBm, step is 3dB. Level 8 is around 0 dBm;

channel setting, range is 0~39, corresponding frequency = 2402+chan*2;

Payload length setting, range is 0-255, unit is byte, 37 bytes is employed generally;

Data type setting;

Packet identification (need to be provided by the packet generator or instrument manufacturer), 0x71764129 is employed generally;

rate setting;

The number of packets sent, 0 means sending packets continuously, other values represent the number of packets to send.