add a function to list all channels that can be used.

src/scripts/create_ap

@@ -300,6 +300,26 @@ can_be_ap() {
     return 1
 }
 
+get_avail_channel_list() {
+    AVAIL_CH_LIST=$(\
+        get_adapter_info ${IFACE} | \
+        grep "\* [0-9]* MHz \[[0-9]*\]" | \
+        while read l; do\
+            [[ $l != *disabled* ]] && [[ $l != *no\ IR* ]] && echo "$l";\
+        done | \
+        sed 's/^* //'
+        )
+
+    if [[ -z "$AVAIL_CH_LIST" ]]; then
+        echo "Cannot determine which channels are supported"
+        return 1
+    # else
+    #     echo "$AVAIL_CH_LIST"
+    fi
+
+    return 0
+}
+
 can_transmit_to_channel() {
     local IFACE CHANNEL_NUM CHANNEL_INFO
     IFACE=$1