Added demo for BLE

examples/ble/CMakeLists.txt

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+# ##############################################################################
+# apps/examples/ble/CMakeLists.txt
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+if(CONFIG_EXAMPLES_BLE)
+  nuttx_add_application(
+    NAME
+    ${CONFIG_EXAMPLES_BLE_PROGNAME}
+    PRIORITY
+    ${CONFIG_EXAMPLES_BLE_PRIORITY}
+    STACKSIZE
+    ${CONFIG_EXAMPLES_BLE_STACKSIZE}
+    MODULE
+    ${CONFIG_EXAMPLES_BLE}
+    SRCS
+    ble_main.c)
+endif()

examples/ble/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_BLE
+	tristate "BLE sensor reading example"
+	default n
+	depends on WIRELESS_BLUETOOTH
+	---help---
+		Enable the BLE example
+
+if EXAMPLES_BLE
+
+config EXAMPLES_BLE_PROGNAME
+	string "Program name"
+	default "ble"
+	---help---
+		This is the name of the program that will be used when the NSH ELF
+		program is installed.
+
+config EXAMPLES_BLE_PRIORITY
+	int "BLE task priority"
+	default 100
+
+config EXAMPLES_BLE_STACKSIZE
+	int "BLE stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+config EXAMPLES_BLE_USE_BME680
+	bool "Use BME680 sensor data"
+	default n
+	depends on SENSORS_BME680
+	---help---
+		If enabled, use real BME680 sensor data. If disabled, use dummy data.
+
+endif

examples/ble/Make.defs

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+############################################################################
+# apps/examples/ble/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_BLE),)
+CONFIGURED_APPS += $(APPDIR)/examples/ble
+endif

examples/ble/Makefile

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+############################################################################
+# apps/examples/ble/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# BLE Barometer sensor example built-in application info
+
+PROGNAME = $(CONFIG_EXAMPLES_BLE_PROGNAME)
+PRIORITY = $(CONFIG_EXAMPLES_BLE_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_BLE_STACKSIZE)
+MODULE = $(CONFIG_EXAMPLES_BLE)
+
+CSRCS = ble.c
+MAINSRC = ble_main.c
+
+ifeq ($(CONFIG_EXAMPLES_BLE_USE_BME680),y)
+    CSRCS += sensors.c
+else
+    CSRCS += dummy.c
+endif
+
+include $(APPDIR)/Application.mk

examples/ble/ble.c

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+#include <nuttx/wireless/bluetooth/bt_core.h>
+#include <nuttx/wireless/bluetooth/bt_gatt.h>
+#include <nuttx/wireless/bluetooth/bt_ioctl.h>
+#include <netpacket/bluetooth.h>
+#include "sensors.h"
+
+#define GASVC                     0x0001
+#define NAME_CHR                  (GASVC + 0x0002)
+#define NAME_DSC                  (GASVC + 0x0003)
+#define APPEARANCE_CHR            (GASVC + 0x0004)
+#define APPEARANCE_DSC            (GASVC + 0x0005)
+#define SENSOR_SVC                (APPEARANCE_DSC + 0x0001)
+#define TEMP_CHR                  (SENSOR_SVC + 0x0001)
+#define TEMP_DSC                  (SENSOR_SVC + 0x0002)
+#define HUM_CHR                   (TEMP_DSC + 0x0001)
+#define HUM_DSC                   (TEMP_DSC + 0x0002)
+#define GAS_CHR                   (HUM_DSC + 0x0001)
+#define GAS_DSC                   (HUM_DSC + 0x0002)
+#define PRESS_CHR                 (GAS_DSC + 0x0001)
+#define PRESS_DSC                 (GAS_DSC + 0x0002)
+
+// Bluetooth UUIDs
+static struct bt_uuid_s g_gap_uuid =
+{
+  .type  = BT_UUID_16,
+  .u.u16 = BT_UUID_GAP,
+};
+
+static struct bt_uuid_s g_device_name_uuid =
+{
+  .type  = BT_UUID_16,
+  .u.u16 = BT_UUID_GAP_DEVICE_NAME,
+};
+
+static struct bt_uuid_s g_appearance_uuid =
+{
+  .type  = BT_UUID_16,
+  .u.u16 = BT_UUID_GAP_APPEARANCE,
+};
+
+static struct bt_uuid_s g_sensor_uuid = {
+    .type = BT_UUID_128,
+    .u.u128 = { 
+        0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0, 
+        0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0
+    }
+};
+
+static struct bt_uuid_s g_temp_uuid =
+{
+  .type = BT_UUID_16,
+  .u.u16 = 0x2A6E, // Temperature UUID
+};
+
+static struct bt_uuid_s g_hum_uuid =
+{
+  .type = BT_UUID_16,
+  .u.u16 = 0x2A6F, // Humidity UUID
+};
+
+static struct bt_uuid_s g_press_uuid =
+{
+  .type = BT_UUID_16,
+  .u.u16 = 0x2A6D, // Pressure UUID
+};
+
+// GATT characteristics
+static struct bt_gatt_chrc_s g_name_chrc =
+{
+  .properties = BT_GATT_CHRC_READ,
+  .value_handle = NAME_DSC,
+  .uuid = &g_device_name_uuid,
+};
+
+static struct bt_gatt_chrc_s g_appearance_chrc =
+{
+  .properties = BT_GATT_CHRC_READ,
+  .value_handle = APPEARANCE_DSC,
+  .uuid = &g_appearance_uuid,
+};
+
+static struct bt_gatt_chrc_s g_temp_chrc =
+{
+  .properties = BT_GATT_CHRC_READ | BT_GATT_CHRC_NOTIFY,
+  .value_handle = TEMP_DSC,
+  .uuid = &g_temp_uuid,
+};
+
+static struct bt_gatt_chrc_s g_hum_chrc =
+{
+  .properties = BT_GATT_CHRC_READ | BT_GATT_CHRC_NOTIFY,
+  .value_handle = HUM_DSC,
+  .uuid = &g_hum_uuid,
+};
+
+static struct bt_gatt_chrc_s g_press_chrc =
+{
+  .properties = BT_GATT_CHRC_READ | BT_GATT_CHRC_NOTIFY,
+  .value_handle = PRESS_DSC,
+  .uuid = &g_press_uuid,
+};
+
+static int read_name(FAR struct bt_conn_s *conn,
+                     FAR const struct bt_gatt_attr_s *attr,
+                     FAR void *buf, uint8_t len, uint16_t offset)
+{
+  const char *name = CONFIG_DEVICE_NAME;
+  return bt_gatt_attr_read(conn, attr, buf, len, offset, name, strlen(name));
+}
+
+static int read_appearance(FAR struct bt_conn_s *conn,
+                           FAR const struct bt_gatt_attr_s *attr,
+                           FAR void *buf, uint8_t len, uint16_t offset)
+{
+  uint16_t appearance = 0; // Set appropriate appearance value
+  return bt_gatt_attr_read(conn, attr, buf, len, offset, &appearance, sizeof(appearance));
+}
+
+static int read_temperature(FAR struct bt_conn_s *conn,
+                            FAR const struct bt_gatt_attr_s *attr,
+                            FAR void *buf, uint8_t len, uint16_t offset)
+{
+  uint16_t temp = (uint16_t) (get_temperature() * 100);
+  return bt_gatt_attr_read(conn, attr, buf, len, offset, &temp, sizeof(uint16_t));
+}
+
+static int read_humidity(FAR struct bt_conn_s *conn,
+                         FAR const struct bt_gatt_attr_s *attr,
+                         FAR void *buf, uint8_t len, uint16_t offset)
+{
+  uint16_t hum = (uint16_t) (get_humidity() * 100);
+  return bt_gatt_attr_read(conn, attr, buf, len, offset, &hum, sizeof(uint16_t));
+}
+
+static int read_gas(FAR struct bt_conn_s *conn,
+                    FAR const struct bt_gatt_attr_s *attr,
+                    FAR void *buf, uint8_t len, uint16_t offset)
+{
+  uint16_t gas = (uint16_t) (get_gas_resistance() * 100);
+  return bt_gatt_attr_read(conn, attr, buf, len, offset, &gas, sizeof(uint16_t));
+}
+
+static int read_pressure(FAR struct bt_conn_s *conn,
+                         FAR const struct bt_gatt_attr_s *attr,
+                         FAR void *buf, uint8_t len, uint16_t offset)
+{
+  uint32_t press = (uint32_t) (get_pressure() * 1000);
+  return bt_gatt_attr_read(conn, attr, buf, len, offset, &press, sizeof(uint32_t));
+}
+
+// GATT attributes
+static const struct bt_gatt_attr_s attrs[] =
+{
+  BT_GATT_PRIMARY_SERVICE(GASVC, &g_gap_uuid),
+  BT_GATT_CHARACTERISTIC(NAME_CHR, &g_name_chrc),
+  BT_GATT_DESCRIPTOR(NAME_DSC, &g_device_name_uuid, BT_GATT_PERM_READ,
+                     read_name, NULL, NULL),
+  BT_GATT_CHARACTERISTIC(APPEARANCE_CHR, &g_appearance_chrc),
+  BT_GATT_DESCRIPTOR(APPEARANCE_DSC, &g_appearance_uuid,
+                     BT_GATT_PERM_READ, read_appearance, NULL, NULL),
+
+  BT_GATT_PRIMARY_SERVICE(SENSOR_SVC, &g_sensor_uuid),
+  BT_GATT_CHARACTERISTIC(TEMP_CHR, &g_temp_chrc),
+  BT_GATT_DESCRIPTOR(TEMP_DSC, &g_temp_uuid, BT_GATT_PERM_READ, read_temperature, NULL, NULL),
+  BT_GATT_CHARACTERISTIC(HUM_CHR, &g_hum_chrc),
+  BT_GATT_DESCRIPTOR(HUM_DSC, &g_hum_uuid, BT_GATT_PERM_READ, read_humidity, NULL, NULL),
+  BT_GATT_CHARACTERISTIC(PRESS_CHR, &g_press_chrc),
+  BT_GATT_DESCRIPTOR(PRESS_DSC, &g_press_uuid, BT_GATT_PERM_READ, read_pressure, NULL, NULL),
+};
+
+static void start_scanning(void) {
+  struct btreq_s btreq;
+  memset(&btreq, 0, sizeof(struct btreq_s));
+  strlcpy(btreq.btr_name, "bnep0", 16);
+  btreq.btr_dupenable = false;
+
+  int sockfd = socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_L2CAP);
+  if (sockfd < 0)
+  {
+    fprintf(stderr, "ERROR: failed to create socket");
+    return;
+  }
+  int ret = ioctl(sockfd, SIOCBTSCANSTART,
+                (unsigned long)((uintptr_t)&btreq));
+  if (ret < 0)
+  {
+    fprintf(stderr, "ERROR:  ioctl(SIOCBTSCANSTART) failed");
+  }
+  close(sockfd);
+}
+
+void setup_ble(void) {
+  // TODO: Scanning is enabled here in order to make advertising work.
+  // It has been noticed that advertising packets are not sent by default,
+  // unless scanning is enabled.
+  start_scanning();
+  bt_gatt_register(attrs, nitems(attrs));
+}

examples/ble/ble_main.c

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+/****************************************************************************
+ * apps/examples/ble/ble_main.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <pthread.h>
+#include "sensors.h"
+
+extern void setup_ble(void);
+
+#define STACKSIZE 2048
+
+int main(int argc, FAR char *argv[]) {
+    int ret;
+
+    init_sensors();
+    setup_ble();
+
+    pthread_t thread;
+    pthread_attr_t attr;
+    struct sched_param param;
+
+    pthread_attr_init(&attr);
+    pthread_attr_setstacksize(&attr, STACKSIZE);
+    param.sched_priority = SCHED_PRIORITY_DEFAULT;
+    pthread_attr_setschedparam(&attr, &param);
+
+    ret = pthread_create(&thread, &attr, monitor_sensors, NULL);
+    if (ret != 0) {
+      printf("Error: pthread_create failed: %d\n", ret);
+      return 1;
+    }
+
+    pthread_join(thread, NULL);
+
+    close_sensors_fd();
+
+    return 0;
+}