* For now, only UI frames without any Layer 3 protocol are handled.
* This however is enough to send/receive APRS packets.
*
- * \version $Id$
* \author Francesco Sacchi <batt@develer.com>
*
*/
#define DECODE_CALL(buf, addr) \
for (unsigned i = 0; i < sizeof((addr)); i++) \
{ \
- (addr)[i] = *(buf)++ >> 1; \
+ char c = (*(buf)++ >> 1); \
+ (addr)[i] = (c == ' ') ? '\x0' : c; \
}
static void ax25_decode(AX25Ctx *ctx)
kfile_putc(c, ctx->ch);
}
-static void ax25_sendCall(AX25Ctx *ctx, const AX25Call *addr)
+static void ax25_sendCall(AX25Ctx *ctx, const AX25Call *addr, bool last)
{
unsigned len = MIN(sizeof(addr->call), strlen(addr->call));
if (len < sizeof(addr->call))
for (unsigned i = 0; i < sizeof(addr->call) - len; i++)
ax25_putchar(ctx, ' ' << 1);
+
+ /* The bit0 of last call SSID should be set to 1 */
+ uint8_t ssid = addr->ssid << 1 | (last ? 0x01 : 0);
+ ax25_putchar(ctx, ssid);
}
/**
- * Send an AX25 frame on the channel.
+ * Send an AX25 frame on the channel through a specific path.
* \param ctx AX25 context to operate on.
- * \param dst the destination callsign for the frame, \see AX25_CALL
- * for a handy way to create a callsign on the fly.
- * \param src the source callsign for the frame, \see AX25_CALL
- * for a handy way to create a callsign on the fly.
+ * \param path An array of callsigns used as path, \see AX25_PATH for
+ * an handy way to create a path.
+ * \param path_len callsigns path lenght.
* \param _buf payload buffer.
* \param len length of the payload.
*/
-void ax25_send(AX25Ctx *ctx, const AX25Call *dst, const AX25Call *src, const void *_buf, size_t len)
+void ax25_sendVia(AX25Ctx *ctx, const AX25Call *path, size_t path_len, const void *_buf, size_t len)
{
const uint8_t *buf = (const uint8_t *)_buf;
+ ASSERT(path);
+ ASSERT(path_len >= 2);
ctx->crc_out = CRC_CCITT_INIT_VAL;
kfile_putc(HDLC_FLAG, ctx->ch);
- ax25_sendCall(ctx, dst);
- ax25_putchar(ctx, dst->ssid << 1);
- ax25_sendCall(ctx, src);
- ax25_putchar(ctx, (src->ssid << 1) | 0x01);
+ /* Send call */
+ for (size_t i = 0; i < path_len; i++)
+ ax25_sendCall(ctx, &path[i], (i == path_len - 1));
+
ax25_putchar(ctx, AX25_CTRL_UI);
ax25_putchar(ctx, AX25_PID_NOLAYER3);
kfile_putc(HDLC_FLAG, ctx->ch);
}
+static void print_call(KFile *ch, const AX25Call *call)
+{
+ kfile_printf(ch, "%.6s", call->call);
+ if (call->ssid)
+ kfile_printf(ch, "-%d", call->ssid);
+}
+
+/**
+ * Print a AX25 message in TNC-2 packet monitor format.
+ * \param ch a kfile channel where the message will be printed.
+ * \param msg the message to be printed.
+ */
+void ax25_print(KFile *ch, const AX25Msg *msg)
+{
+ print_call(ch, &msg->src);
+ kfile_putc('>', ch);
+ print_call(ch, &msg->dst);
+
+ #if CONFIG_AX25_RPT_LST
+ for (int i = 0; i < msg->rpt_cnt; i++)
+ {
+ kfile_putc(',', ch);
+ print_call(ch, &msg->rpt_lst[i]);
+ // TODO: add * to the trasmitting digi
+ }
+ #endif
+
+ kfile_printf(ch, ":%.*s\n", msg->len, msg->info);
+}
+
/**
* Init the AX25 protocol decoder.