ESP32 数据包错误检查中的 BLE

Question

when transmit data from esp32 to an esp32,does the BLE's libary contain errorchecking? AKA resending packets? uses Ack-Naks? error correction also?

Thanks

Answer 1

There is error checking. You can check if a write was successful.

A Ble packet consist of:

• Preamble: RF synchronization sequence.

• Access address: 32 bits, advertising or data access addresses (it is used to identify the communication).

• Header: its content depends on the packet type (advertising or data
  packet).

• Length: Length of the data payload(When encryption is used, the
  message integrity code (MIC) at the end of the packet is 4 bytes, so this leads to 251 bytes as actual maximum available payload size.

• Checksum: CRC.

  There is no error correction or resending of packets, unless you implement it yourself. So,if a write was not successful you can resend a packet.