Signed-off-by: Robert Marshall KI4MCW <ki4mcw@gmail.com>

According to the protocol document...

http://www.tapr.org/pdf/AX25.2.2.pdf

...bits 6 and 5 in the SSID should be set to 1 if unused. In a
simplified use case such as APRS, bit 7 can be set to 0 for the source
and destination SSIDs. This yields an offset of 0x60 for all SSIDs in
the path, which can be ORed in prior to transmission.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4618 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/net/ax25.c b/bertos/net/ax25.c
index 3d5ac3431f0d82059e0836416da318f69e036647..2ea17efb3a8d1d8a9d1d76d97b1637c2a2ff0f27 100644 (file)
--- a/bertos/net/ax25.c
+++ b/bertos/net/ax25.c
@@ -210,8 +210,9 @@ static void ax25_sendCall(AX25Ctx *ctx, const AX25Call *addr, bool last)
                for (unsigned i = 0; i < sizeof(addr->call) - len; i++)
                        ax25_putchar(ctx, ' ' << 1);
 
+       /* Bits6:5 should be set to 1 for all SSIDs (0x60) */
        /* The bit0 of last call SSID should be set to 1 */
-       uint8_t ssid = addr->ssid << 1 | (last ? 0x01 : 0);
+       uint8_t ssid = 0x60 | (addr->ssid << 1) | (last ? 0x01 : 0);
        ax25_putchar(ctx, ssid);
 }