1 /*
2 * Copyright (c) 2023 Nordic Semiconductor ASA
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/bluetooth/bluetooth.h>
8 #include <zephyr/bluetooth/uuid.h>
9
10 #define SERVICE_DATA_LEN 9
11 #define SERVICE_UUID 0xfcd2 /* BTHome service UUID */
12 #define IDX_TEMPL 4 /* Index of lo byte of temp in service data*/
13 #define IDX_TEMPH 5 /* Index of hi byte of temp in service data*/
14
15 #define ADV_PARAM BT_LE_ADV_PARAM(BT_LE_ADV_OPT_USE_IDENTITY, \
16 BT_GAP_ADV_SLOW_INT_MIN, \
17 BT_GAP_ADV_SLOW_INT_MAX, NULL)
18
19
20 static uint8_t service_data[SERVICE_DATA_LEN] = {
21 BT_UUID_16_ENCODE(SERVICE_UUID),
22 0x40,
23 0x02, /* Temperature */
24 0xc4, /* Low byte */
25 0x00, /* High byte */
26 0x03, /* Humidity */
27 0xbf, /* 50.55% low byte*/
28 0x13, /* 50.55% high byte*/
29 };
30
31 static struct bt_data ad[] = {
32 BT_DATA_BYTES(BT_DATA_FLAGS, BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR),
33 BT_DATA(BT_DATA_NAME_COMPLETE, CONFIG_BT_DEVICE_NAME, sizeof(CONFIG_BT_DEVICE_NAME) - 1),
34 BT_DATA(BT_DATA_SVC_DATA16, service_data, ARRAY_SIZE(service_data))
35 };
36
bt_ready(int err)37 static void bt_ready(int err)
38 {
39 if (err) {
40 printk("Bluetooth init failed (err %d)\n", err);
41 return;
42 }
43
44 printk("Bluetooth initialized\n");
45
46 /* Start advertising */
47 err = bt_le_adv_start(ADV_PARAM, ad, ARRAY_SIZE(ad), NULL, 0);
48 if (err) {
49 printk("Advertising failed to start (err %d)\n", err);
50 return;
51 }
52 }
53
main(void)54 int main(void)
55 {
56 int err;
57 int temp = 0;
58
59 printk("Starting BTHome sensor template\n");
60
61 /* Initialize the Bluetooth Subsystem */
62 err = bt_enable(bt_ready);
63 if (err) {
64 printk("Bluetooth init failed (err %d)\n", err);
65 return 0;
66 }
67
68 for (;;) {
69 /* Simulate temperature from 0C to 25C */
70 service_data[IDX_TEMPH] = (temp * 100) >> 8;
71 service_data[IDX_TEMPL] = (temp * 100) & 0xff;
72 if (temp++ == 25) {
73 temp = 0;
74 }
75 err = bt_le_adv_update_data(ad, ARRAY_SIZE(ad), NULL, 0);
76 if (err) {
77 printk("Failed to update advertising data (err %d)\n", err);
78 }
79 k_sleep(K_MSEC(BT_GAP_ADV_SLOW_INT_MIN));
80 }
81 return 0;
82 }
83
