The wiring you use will depend on the module you are trying to connect. One uses SPI to communicate, the other uses UART with flow control (TXD, RXD, CTS, RTS). There are two variants of the nRF51 Bluefruit LE modules. Details of this SPI transport layer are detailed in SDEP.md in this same folder. If your are using an SPI board, the AT commands are wrapped in a thin SDEP (Simple Data Exchange Protocol) wrapper to transmit and received text data over the binary SPI transport. If you are using a UART board, the commands are sent directly as text using a SW serial transport. The Bluefruit LE modules this library talks to use AT-style commands and responses.
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