To use it, the following interface needs to be provided to the library, which expects function pointers with these signatures:
/* to get the millisecond count since reset */
uint32_t (*fpm_millis_func)(void);
/* to read from the UART port connected to the module */
uint16_t (*fpm_uart_read_func)(uint8_t * bytes, uint16_t len);
/* to write to the UART port connected to the module */
void (*fpm_uart_write_func)(uint8_t * bytes, uint16_t len);
/* to get the current number of available bytes to be read */
uint16_t (*fpm_uart_avail_func)(void);
It is assumed that UART interrupts are in use, especially for RX events, typically with incoming data being read into a buffer. Check the examples for details.
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