gnrc_gomach: add duty-cycle printing command

examples/gnrc_networking_mac/mac.c

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2018 Shuguo Zhuo
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     examples
+ * @{
+ *
+ * @file
+ * @brief       MAC shell commands
+ *
+ * @author      Shuguo Zhuo <zhuosgzju@gmail.com>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+
+#include "net/gnrc.h"
+#include "net/gnrc/mac/types.h"
+
+int mac_cmd(int argc, char **argv)
+{
+    if (argc < 2) {
+        printf("usage: %s duty\n", argv[0]);
+        return 1;
+    }
+
+    if (strcmp(argv[1], "duty") == 0) {
+#if (GNRC_MAC_ENABLE_DUTYCYCLE_RECORD == 1)
+        gnrc_netif_t *netif = NULL;
+        netif = gnrc_netif_iter(netif);
+
+        msg_t msg;
+        msg.type = GNRC_MAC_TYPE_GET_DUTYCYCLE;
+        msg_send(&msg, netif->pid);
+#else
+        puts("MAC: radio duty-cycle unavailable.");
+#endif
+    }
+    else {
+        puts("error: invalid command");
+    }
+    return 0;
+}

examples/gnrc_networking_mac/main.c

@@ -29,9 +29,11 @@
 static msg_t _main_msg_queue[MAIN_QUEUE_SIZE];
 
 extern int udp_cmd(int argc, char **argv);
+extern int mac_cmd(int argc, char **argv);
 
 static const shell_command_t shell_commands[] = {
     { "udp", "send data over UDP and listen on UDP ports", udp_cmd },
+    { "mac", "get MAC protocol's internal information", mac_cmd },
     { NULL, NULL, NULL }
 };