libgsmhr1 TFO: require BFI=0 and SID=0 for homing In order for a received frame to be recognized as DHF, we need not only the correct bit pattern, but also BFI=0 and SID=0. The BFI=0 requirement should be obvious, while the SID=0 requirement is needed only for HR codec. With FR and EFR, SID classification comes from the payload bits and no separate check is needed - but in HR we get an out-of-band SID ternary flag. When SID=1, no payload bits are used at all; when SID=2, we use only the first 33 bits of the payload. Therefore, it is proper to conditionalize DHF acceptance on SID=0. We already implemented this logic in the just finished full decoder; now bring TFO code into agreement.

/*
 * Here we implement our emit_hex_frame() function.
 */

#include <stdio.h>
#include <stdint.h>
#include "tw5writer.h"

void emit_hex_frame(FILE *outf, const uint8_t *frame, unsigned nbytes)
{
	unsigned n;

	for (n = 0; n < nbytes; n++)
		fprintf(outf, "%02X", frame[n]);
	putc('\n', outf);
}