add program to attempt LAPD setup from DAHDI to RBS

rbs_lapd/rbs_lapd.c

@@ -0,0 +1,76 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+
+/* this program wants to be called with 'strace -s1024 -x' so you see the data
+ * betewen DAHDI and it */
+
+const uint8_t aa_frame[] = { 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+			   0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa };
+
+const uint8_t ff_frame[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+			   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+
+//const uint8_t sabme_frame[] = { 0xFA, 0x7D, 0x7F };
+
+const uint8_t sabme_frame[] = { 0x7e, 0x7e, 0x7e, 0x5f, 0x5f, 0x3e, 0xce, 0x49, 0xef, 0xcf, 0xcf, 0xcf, 0xcf, 0xcf };
+
+static int fd;
+static uint8_t dummy_buf[8192];
+
+static void dummy_read(int fd, unsigned int len)
+{
+	int rc;
+
+	if (len > sizeof(dummy_buf))
+		len = sizeof(dummy_buf);
+
+	rc = read(fd, dummy_buf, len);
+}
+
+/* try to re-create the initialization routine as from a trace between Racal 6113 and RBS */
+static void init(void)
+{
+	int i;
+	uint8_t fiftyfive = 0x55;
+
+	/* first play some 0xaa sequences */
+	for (i = 1; i < 50; i++) {
+		write(fd, aa_frame, sizeof(aa_frame));
+		dummy_read(fd, sizeof(aa_frame));
+	}
+	/* 0xaa sequence with final 0x55 */
+	write(fd, aa_frame, sizeof(aa_frame)-1);
+	write(fd, &fiftyfive, 1);
+	dummy_read(fd, sizeof(aa_frame));
+
+	/* play some 0xff sequence */
+	for (i = 0x92f; i < 0x960; i++) {
+		write(fd, ff_frame, sizeof(aa_frame));
+		dummy_read(fd, sizeof(aa_frame));
+	}
+
+	/* send a SABME frame */
+	write(fd, sabme_frame, sizeof(sabme_frame));
+
+	/* endless loop, read data. */
+	while (1)
+		dummy_read(fd, sizeof(sabme_frame));
+}
+
+int main(int argc, char **argv)
+{
+	if (argc < 2)
+		exit(2);
+
+	fd = open(argv[1], O_RDWR);
+	if (fd < 0) {
+		perror("open");
+		exit(1);
+	}
+
+	init();
+}