7.5.2 Hardware Flow Control

When using Transparent UART for streaming data application, it is important to include the RTS/CTS hardware lines, and enable the hardware control feature. Without hardware flow control, it is possible for host to cause buffer overflow on RN4870 UART, which can result in instability.

When issuing frequent RN487x GATT access commands (SHW, SHR, SUW, SUR, CHW, CHR, CUW, CUR), higher command throughput is achieved by disabling flow control. The host MCU issuing the GATT commands must wait for a response, such as "AOK" before issuing the next command.