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/devif/devif.h

@@ -74,7 +74,8 @@
  *   TCP_NEWDATA      IN: Set to indicate that the peer has sent us new data.
  *   UDP_NEWDATA     OUT: Cleared (only) by the socket layer logic to indicate
  *   PKT_NEWDATA          that the new data was consumed, suppressing further
- *   IEEE802154_NEWDATA   attempts to process the new data.
+ *   BLUETOOTH_NEWDATA    attempts to process the new data.
+ *   IEEE802154_NEWDATA
  *
  *   TCP_SNDACK       IN: Not used; always zero
  *                   OUT: Set by the socket layer if the new data was consumed
@@ -87,8 +88,8 @@
  *   TCP_POLL        IN:  Used for polling the socket layer.  This is provided
  *   UDP_POLL             periodically from the drivers to support (1) timed
  *   PKT_POLL             operations, and (2) to check if the socket layer has
- *   IEEE802154_POLL      data that it wants to send.  These are socket oriented
- *                        callbacks where the context depends on the specific
+ *   BLUETOOTH_POLL       data that it wants to send.  These are socket oriented
+ *   IEEE802154_POLL      callbacks where the context depends on the specific
  *                        set
  *                   OUT: Not used
  *
@@ -177,6 +178,7 @@
 #define TCP_ACKDATA        (1 << 0)
 #define TCP_NEWDATA        (1 << 1)
 #define UDP_NEWDATA        TCP_NEWDATA
+#define BLUETOOTH_NEWDATA  TCP_NEWDATA
 #define IEEE802154_NEWDATA TCP_NEWDATA
 #define PKT_NEWDATA        TCP_NEWDATA
 #define WPAN_NEWDATA       TCP_NEWDATA
@@ -186,6 +188,7 @@
 #define TCP_POLL           (1 << 4)
 #define UDP_POLL           TCP_POLL
 #define PKT_POLL           TCP_POLL
+#define BLUETOOTH_POLL     TCP_POLL
 #define IEEE802154_POLL    TCP_POLL
 #define WPAN_POLL          TCP_POLL
 #define TCP_BACKLOG        (1 << 5)

net/devif/devif_poll.c

@@ -1,7 +1,8 @@
 /****************************************************************************
  * net/devif/devif_poll.c
  *
- *   Copyright (C) 2007-2010, 2012, 2014, 2016-2017 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2010, 2012, 2014, 2016-2018 Gregory Nutt. All rights
+ *     reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -53,6 +54,7 @@
 #include "tcp/tcp.h"
 #include "udp/udp.h"
 #include "pkt/pkt.h"
+#include "bluetooth/bluetooth.h"
 #include "ieee802154/ieee802154.h"
 #include "icmp/icmp.h"
 #include "icmpv6/icmpv6.h"
@@ -238,6 +240,42 @@ static int devif_poll_pkt_connections(FAR struct net_driver_s *dev,
 }
 #endif /* CONFIG_NET_PKT */
 
+/****************************************************************************
+ * Name: devif_poll_bluetooth_connections
+ *
+ * Description:
+ *   Poll all packet connections for available packets to send.
+ *
+ * Assumptions:
+ *   This function is called from the MAC device driver with the network
+ *   locked.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NET_BLUETOOTH
+static int devif_poll_bluetooth_connections(FAR struct net_driver_s *dev,
+                                            devif_poll_callback_t callback)
+{
+  FAR struct bluetooth_conn_s *bluetooth_conn = NULL;
+  int bstop = 0;
+
+  /* Traverse all of the allocated packet connections and perform the poll action */
+
+  while (!bstop && (bluetooth_conn = bluetooth_conn_next(bluetooth_conn)))
+    {
+      /* Perform the packet TX poll */
+
+      bluetooth_poll(dev, bluetooth_conn);
+
+      /* Call back into the driver */
+
+      bstop = callback(dev);
+    }
+
+  return bstop;
+}
+#endif /* CONFIG_NET_BLUETOOTH */
+
 /****************************************************************************
  * Name: devif_poll_ieee802154_connections
  *
@@ -561,6 +599,15 @@ int devif_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback)
 
   if (!bstop)
 #endif
+#ifdef CONFIG_NET_BLUETOOTH
+    {
+      /* Check for pending PF_BLUETOOTH socket transfer */
+
+      bstop = devif_poll_bluetooth_connections(dev, callback);
+    }
+
+  if (!bstop)
+#endif
 #ifdef CONFIG_NET_IEEE802154
     {
       /* Check for pending PF_IEEE802154 socket transfer */