drivers/wireless/bluetooth: Add a NULL device to support some very low level testing on the Simulator.

configs/sim/src/sim_bringup.c

@@ -52,6 +52,7 @@
 #include <nuttx/video/fb.h>
 #include <nuttx/timers/oneshot.h>
 #include <nuttx/wireless/pktradio.h>
+#include <nuttx/wireless/bt_null.h>
 #include <nuttx/wireless/ieee802154/ieee802154_loopback.h>
 
 #include "up_internal.h"
@@ -256,6 +257,16 @@ int sim_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_BLUETOOTH_NULL
+  /* Register the NULL Bluetooth network device */
+
+  ret = btnull_register();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: btnull_register() failed: %d\n", ret);
+    }
+#endif
+
   UNUSED(ret);
   return OK;
 }

drivers/audio/Kconfig

@@ -249,7 +249,7 @@ config AUDIO_NULL
 	default n
 	depends on AUDIO
 	---help---
-		A do-nothinig audio device driver to simplify testing of audio
+		A do-nothing audio device driver to simplify testing of audio
 		decoders.
 
 if AUDIO_NULL

drivers/wireless/bluetooth/Kconfig

@@ -47,4 +47,13 @@ config BLUETOOTH_UART
 	---help---
 		Enable Bluetooth UART driver.
 
+config BLUETOOTH_NULL
+	bool "NULL Bluetooth device"
+	default n
+	---help---
+		A do-nothing Bluetooth device driver to permit some basic testing of
+		the Bluetooth stack on the simulator.  This driver just "closes the
+		loop" and nothing more:  It is a just a bit-bucket for outgoing
+		packets; it generates no incoming packets.
+
 endif # DRIVERS_BLUETOOTH

drivers/wireless/bluetooth/Make.defs

@@ -43,6 +43,10 @@ ifeq ($(CONFIG_BLUETOOTH_UART),y)
 CSRCS += bt_uart.c
 endif
 
+ifeq ($(CONFIG_BLUETOOTH_NULL),y)
+CSRCS += bt_null.c
+endif
+
 # Include common Bluetooth drvier build support
 
 DEPPATH += --dep-path wireless$(DELIM)bluetooth

drivers/wireless/bluetooth/bt_null.c

@@ -0,0 +1,100 @@
+/****************************************************************************
+ * drivers/wireless/bluetooth/bt_null.c
+ * UART based Bluetooth driver
+ *
+ *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/wireless/bt_driver.h>
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static int btnull_open(FAR const struct bt_driver_s *dev);
+static int btnull_send(FAR const struct bt_driver_s *dev,
+                       FAR struct bt_buf_s *buf);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct bt_driver_s g_bt_null =
+{
+  0,            /* head_reserve */
+  btnull_open,  /* open */
+  btnull_send   /* send */
+}
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static int btnull_send(FAR const struct bt_driver_s *dev,
+                       FAR struct bt_buf_s *buf)
+{
+  return OK;
+}
+
+static int btnull_open(FAR const struct bt_driver_s *dev)
+{
+  return OK;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: btnull_register
+ *
+ * Description:
+ *   Register the NULL Bluetooth stack with the Bluetooth stack
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Zero is returned on success; a negated errno value is returned on any
+ *   failure.
+ *
+ ****************************************************************************/
+
+int btnull_register(void)
+{
+  /* Register the driver with the Bluetooth stack */
+
+  return bt_driver_register(&g_bt_null);
+}

drivers/wireless/bluetooth/bt_uart.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * drivers/wireless/bluetooth/btuart.c
+ * drivers/wireless/bluetooth/bt_uart.c
  * UART based Bluetooth driver
  *
  *   Copyright (C) 2018 Gregory Nutt. All rights reserved.

include/nuttx/wireless/bt_null.h

@@ -0,0 +1,60 @@
+/****************************************************************************
+ * drivers/wireless/bluetooth/bt_null.h
+ * NULL based Bluetooth driver
+ *
+ *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_WIRELESS_BT_NULL_H
+#define __INCLUDE_NUTTX_WIRELESS_BT_NULL_H 1
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: btnull_register
+ *
+ * Description:
+ *   Register the NULL Bluetooth stack with the Bluetooth stack
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   Zero is returned on success; a negated errno value is returned on any
+ *   failure.
+ *
+ ****************************************************************************/
+
+int btnull_register(void);
+
+#endif /* __INCLUDE_NUTTX_WIRELESS_BT_NULL_H */