Add Exchange MTU in interactive gatttool
diff --git a/attrib/interactive.c b/attrib/interactive.c
index a9157e7..3fafb1e 100644
--- a/attrib/interactive.c
+++ b/attrib/interactive.c
@@ -362,6 +362,7 @@
g_attrib_unref(attrib);
attrib = NULL;
+ opt_mtu = 0;
g_io_channel_shutdown(iochannel, FALSE, NULL);
g_io_channel_unref(iochannel);
@@ -654,6 +655,65 @@
}
}
+static void exchange_mtu_cb(guint8 status, const guint8 *pdu, guint16 plen,
+ gpointer user_data)
+{
+ uint16_t mtu;
+
+ if (status != 0) {
+ printf("Exchange MTU Request failed: %s\n",
+ att_ecode2str(status));
+ return;
+ }
+
+ if (!dec_mtu_resp(pdu, plen, &mtu)) {
+ printf("Protocol error\n");
+ return;
+ }
+
+ mtu = MIN(mtu, opt_mtu);
+ /* Set new value for MTU in client */
+ if (g_attrib_set_mtu(attrib, mtu))
+ printf("MTU was exchanged successfully: %d\n", mtu);
+ else
+ printf("Error exchanging MTU\n");
+}
+
+static void cmd_mtu(int argcp, char **argvp)
+{
+ if (conn_state != STATE_CONNECTED) {
+ printf("Command failed: not connected.\n");
+ return;
+ }
+
+ if (opt_psm) {
+ printf("Command failed: operation is only available for LE"
+ " transport.\n");
+ return;
+ }
+
+ if (argcp < 2) {
+ printf("Usage: mtu <value>\n");
+ return;
+ }
+
+ if (opt_mtu) {
+ printf("Command failed: MTU exchange can only occur once per"
+ " connection.\n");
+ return;
+ }
+
+ errno = 0;
+ opt_mtu = strtoll(argvp[1], NULL, 0);
+ if (errno != 0 || opt_mtu < ATT_DEFAULT_LE_MTU) {
+ printf("Invalid value. Minimum MTU size is %d\n",
+ ATT_DEFAULT_LE_MTU);
+ return;
+ }
+
+ gatt_exchange_mtu(attrib, opt_mtu, exchange_mtu_cb, NULL);
+}
+
static struct {
const char *cmd;
void (*func)(int argcp, char **argvp);
@@ -684,6 +744,8 @@
"Characteristic Value Write (No response)" },
{ "sec-level", cmd_sec_level, "[low | medium | high]",
"Set security level. Default: low" },
+ { "mtu", cmd_mtu, "<value>",
+ "Exchange MTU for GATT/ATT" },
{ NULL, NULL, NULL}
};
