This comment adds (1) basic support for AF_BLUETOOTH sockets. The logic compiles but is still incomplete. Support for Bluetooth is general is still dependent on CONFIG_EXPERMIMENTAL because it is not yet ready for used.

Squashed commit of the following:

    wireless/bluetooth:  Some small changes that gets to a clean compile by just eliminating some incorrect implementations (still with a lot of warnings.  The logic is still incomplete but now not so lethal.
    wireless/bluetooth:  Restructuring:  Connection interfaces should internal to wireless/bluetooth.  include/nuttx/wireless/bt_conn.h removed and merged with wireless/bluetooth/bt_conn.h.  Several fix to get closer to bt_netdev.c compiling.  Need to design some not interfaces and use some existing interfaces to send and receiv packets.
    wireless/bluetooth: Some organization with some network device compile errors fixed.  Still not even close to compiling.
    net/bluetooth:  Fix numerous compile issues; Still open design issues with regard to the interface with the Bluetooth stack.
    wireless/bluetooth:  Create bt_netdev.c with a crude copy of mac802154_netdev.c.  Does not not even compile yet.
    include/nuttx/net:  Add bluetooth.h.  Content is not yet correct.
    net/netpackets:  Add bluetooth.h.  Update net/bluetooth to use new socket address definition.
    net/bluetooth:  Some fixes for initial build.
    net/bluetooth:  Add initial support for Bluetooth sockets.  The initial cut is just the a clone of the IEEE 802.15.4 socket support with name changes.
    net/ieee802154:  Fix some typos noted when cloning to create net/bluetooth.

net/netdev/netdev_ioctl.c

@@ -1,7 +1,7 @@
 /****************************************************************************
  * net/netdev/netdev_ioctl.c
  *
- *   Copyright (C) 2007-2012, 2015-2017 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2012, 2015-2018 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -73,6 +73,10 @@
 #endif
 
 #if defined(CONFIG_NETDEV_IOCTL) && defined(CONFIG_NET_6LOWPAN)
+#  ifdef CONFIG_WIRELESS_BLUETOOTH
+#    include <nuttx/wireless/bt_ioctl.h>
+#  endif
+
 #  ifdef CONFIG_WIRELESS_IEEE802154
 #    include <nuttx/wireless/ieee802154/ieee802154_mac.h>
 #  endif
@@ -370,6 +374,68 @@ static void ioctl_set_ipv6addr(FAR net_ipv6addr_t outaddr,
 }
 #endif
 
+/****************************************************************************
+ * Name: netdev_iee802154_ioctl
+ *
+ * Description:
+ *   Perform Bluetooth network device specific operations.
+ *
+ * Input Parameters:
+ *   psock  - Socket structure
+ *   dev    - Ethernet driver device structure
+ *   cmd    - The ioctl command
+ *   req    - The argument of the ioctl cmd
+ *
+ * Returned Value:
+ *   >=0 on success (positive non-zero values are cmd-specific)
+ *   Negated errno returned on failure.
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_NETDEV_IOCTL) && defined(CONFIG_NET_6LOWPAN) && \
+    defined(CONFIG_WIRELESS_BLUETOOTH)
+static int netdev_iee802154_ioctl(FAR struct socket *psock, int cmd,
+                                  unsigned long arg)
+{
+  FAR struct net_driver_s *dev;
+  FAR char *ifname;
+  int ret = -ENOTTY;
+
+  if (arg != 0ul)
+    {
+      if (WL_IBLUETOOTHCMD(cmd))
+        {
+          /* Get the name of the Bluetooth device to receive the IOCTL
+           * command
+           */
+
+          FAR struct bluetooth_ifreq_s *cmddata =
+            (FAR struct bluetooth_ifreq_s *)((uintptr_t)arg);
+
+          ifname = cmddata->ifr_name;
+        }
+      else
+        {
+          /* Not a Bluetooth IOCTL command */
+
+          return -ENOTTY;
+        }
+
+      /* Find the device with this name */
+
+      dev = netdev_findbyname(ifname);
+      if (dev != NULL && dev->d_lltype == NET_LL_BLUETOOTH)
+        {
+          /* Perform the device IOCTL */
+
+          ret = dev->d_ioctl(dev, cmd, arg);
+        }
+    }
+
+  return ret;
+}
+#endif
+
 /****************************************************************************
  * Name: netdev_iee802154_ioctl
  *