altos: Require callsign match in packet code

[fw/altos] / src / cc1111 / ao_packet.c

diff --git a/src/cc1111/ao_packet.c b/src/cc1111/ao_packet.c
index f502d67c598295672f1ad73540300f3da747ca2a..7eeb07108f2504285983839bafa294bc55fb01cc 100644 (file)
--- a/src/cc1111/ao_packet.c
+++ b/src/cc1111/ao_packet.c
@@ -68,6 +68,15 @@ ao_packet_recv(void)
        if (!(ao_rx_packet.status & PKT_APPEND_STATUS_1_CRC_OK))
                return 0;
 
+       /* Accept packets with matching call signs, or any packet if
+        * our callsign hasn't been configured
+        */
+       if (ao_xmemcmp(ao_rx_packet.packet.callsign,
+                      ao_config.callsign,
+                      AO_MAX_CALLSIGN) != 0 &&
+           ao_xmemcmp(ao_config.callsign, CODE_TO_XDATA("N0CALL"), 7) != 0)
+               return 0;
+
        /* SYN packets carry no data */
        if (ao_rx_packet.packet.len == AO_PACKET_SYN) {
                rx_seq = ao_rx_packet.packet.seq;