Bluetooth advertise

CMakeLists.txt

@@ -3,4 +3,4 @@ find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 
 project(hellobt)
 
-target_sources(app PRIVATE src/main.cpp)
+target_sources(app PRIVATE src/main.c)

boards/arm/nrf52840_test/nrf52840_test.dts

@@ -4,6 +4,7 @@
 /dts-v1/;
 #include <nordic/nrf52840_qiaa.dtsi>
 
+// https://wiki.makerdiary.com/nrf52840-mdk-usb-dongle/getting-started/
 / {
 	model = "nrf52840_test";
 	compatible = "nrf52840-test";

prj.conf

@@ -11,3 +11,8 @@ CONFIG_BT=y
 CONFIG_BT_HCI=y
 CONFIG_BT_CTLR=y
 CONFIG_BT_LL_SW_SPLIT=y
+CONFIG_BT_DEVICE_NAME="HelloBT_Peripheral"
+CONFIG_BT_PERIPHERAL=y
+
+# Enable print for float
+CONFIG_CBPRINTF_FP_SUPPORT=y

src/main.c

@@ -0,0 +1,60 @@
+#include "zephyr/kernel.h"
+#include "zephyr/drivers/gpio.h"
+#include "zephyr/random/rand32.h"
+
+#include "zephyr/bluetooth/bluetooth.h"
+#include "zephyr/bluetooth/uuid.h"
+#include "zephyr/bluetooth/addr.h"
+#include "zephyr/bluetooth/hci.h"
+#include <stdio.h>
+
+#define DEVICE_NAME CONFIG_BT_DEVICE_NAME
+#define DEVICE_NAME_LEN (sizeof(DEVICE_NAME) - 1)
+#define COMPANY_ID_CODE 0x0059
+
+// static struct bt_le_adv_param* adv_param = BT_LE_ADV_PARAM(
+//     BT_LE_ADV_OPT_NONE,
+//     800,
+//     801,
+//     NULL
+// );
+static uint8_t url_data[] = {
+    0x17, '/', '/', 'n', 'r', 'z', '.', 's', 'e'
+};
+
+// Advertisment data
+static const struct bt_data ad[] = {
+    BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
+    BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),
+};
+
+// Scan response packet
+static const struct bt_data sd[] = {
+    BT_DATA(BT_DATA_URI, url_data, sizeof(url_data)),
+    // BT_DATA_BYTES(BT_DATA_UUID128_ALL, BT_UUID_128_ENCODE(0x00001523, 0x1212, 0xefde, 0x1523, 0x785feabcd123)),
+};
+
+int main() {
+    int err;
+
+    err = bt_enable(NULL);
+    if (err) {
+        printk("Bluetooth init failed (err %d)\n", err);
+        return 1;
+    }
+    printk("Bluetooth initialised!\n");
+
+    err = bt_le_adv_start(BT_LE_ADV_NCONN, ad, ARRAY_SIZE(ad), sd, ARRAY_SIZE(sd));
+    if (err) {
+        printk("Advertising failed to start (err %d)\n", err);
+        return 1;
+    }
+    printk("Advertising successfully started!\n");
+
+    while (true) {
+        float value = (float)(sys_rand32_get() % 1000)/1000.0f;
+        printk("%u: Hello, World! %.3f\n", k_uptime_get_32(), value);
+        k_msleep(250);
+    }
+    return 0;
+}

src/main.cpp

@@ -1,18 +0,0 @@
-#include "zephyr/kernel.h"
-#include "zephyr/drivers/gpio.h"
-#include "zephyr/random/rand32.h"
-
-#define LED_NODE DT_ALIAS(led0)
-static gpio_dt_spec led = GPIO_DT_SPEC_GET(LED_NODE, gpios);
-
-auto main() -> int {
-    if (!gpio_is_ready_dt(&led)) return 1;
-    if (gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE) < 0) return 1;
-
-    gpio_pin_set_dt(&led, 0);
-    while (true) {
-        printk("Hello, World! %d - %u\n", 100'000, sys_rand32_get());
-        k_msleep(250);
-    }
-    return 0;
-}