Fix: Use DISC on dlc 0 instead of CLD

Some MUX implementations do not seem to support Multiplexer Closedown
(CLD) command.  The standard specifies that sending DISC on DLC 0 should
act exactly the same as CLD.

diff --git a/gatchat/gsm0710.c b/gatchat/gsm0710.c
index 8003680..39c16da 100644 (file)
--- a/gatchat/gsm0710.c
+++ b/gatchat/gsm0710.c
@@ -37,8 +37,6 @@
 #define GSM0710_DATA_ALT               0x03
 #define GSM0710_STATUS_SET             0xE3
 #define GSM0710_STATUS_ACK             0xE1
-#define GSM0710_TERMINATE_BYTE1                0xC3
-#define GSM0710_TERMINATE_BYTE2                0x01
 
 /* Initialize a GSM 07.10 context, in preparation for startup */
 void gsm0710_initialize(struct gsm0710_context *ctx)
@@ -212,8 +210,6 @@ int gsm0710_startup(struct gsm0710_context *ctx)
 /* Shut down the GSM 07.10 session, closing all channels */
 void gsm0710_shutdown(struct gsm0710_context *ctx)
 {
-       static const unsigned char terminate[2] = { GSM0710_TERMINATE_BYTE1,
-                                               GSM0710_TERMINATE_BYTE2 };
        int channel;
 
        for (channel = 1; channel <= GSM0710_MAX_CHANNELS; ++channel) {
@@ -224,7 +220,7 @@ void gsm0710_shutdown(struct gsm0710_context *ctx)
                                        GSM0710_CLOSE_CHANNEL, NULL, 0);
        }
 
-       gsm0710_write_frame(ctx, 0, GSM0710_DATA, terminate, 2);
+       gsm0710_write_frame(ctx, 0, GSM0710_CLOSE_CHANNEL, NULL, 0);
        memset(ctx->used_channels, 0, sizeof(ctx->used_channels));
 }