diff options
Diffstat (limited to 'app/src/split/bluetooth')
| -rw-r--r-- | app/src/split/bluetooth/central.c | 241 | ||||
| -rw-r--r-- | app/src/split/bluetooth/service.c | 1 |
2 files changed, 242 insertions, 0 deletions
diff --git a/app/src/split/bluetooth/central.c b/app/src/split/bluetooth/central.c new file mode 100644 index 0000000..1adc5c8 --- /dev/null +++ b/app/src/split/bluetooth/central.c @@ -0,0 +1,241 @@ +/* + * Copyright (c) 2020 Peter Johanson + * + * SPDX-License-Identifier: MIT + */ + +#include <zephyr/types.h> + +#include <bluetooth/bluetooth.h> +#include <bluetooth/conn.h> +#include <bluetooth/uuid.h> +#include <bluetooth/gatt.h> +#include <sys/byteorder.h> + +#include <logging/log.h> + +LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL); + +#include <zmk/split/bluetooth/uuid.h> + +static int start_scan(void); + +static struct bt_conn *default_conn; + +static struct bt_uuid_16 uuid = BT_UUID_INIT_16(0); +static struct bt_gatt_discover_params discover_params; +static struct bt_gatt_subscribe_params subscribe_params; + +static u8_t notify_func(struct bt_conn *conn, + struct bt_gatt_subscribe_params *params, + const void *data, u16_t length) +{ + if (!data) { + LOG_DBG("[UNSUBSCRIBED]"); + params->value_handle = 0U; + return BT_GATT_ITER_STOP; + } + + LOG_DBG("[NOTIFICATION] data %p length %u", data, length); + + return BT_GATT_ITER_CONTINUE; +} + +static u8_t discover_func(struct bt_conn *conn, + const struct bt_gatt_attr *attr, + struct bt_gatt_discover_params *params) +{ + int err; + + if (!attr) { + LOG_DBG("Discover complete"); + (void)memset(params, 0, sizeof(*params)); + return BT_GATT_ITER_STOP; + } + + LOG_DBG("[ATTRIBUTE] handle %u", attr->handle); + + if (!bt_uuid_cmp(discover_params.uuid, ZMK_BT_UUID_SPLIT)) { + memcpy(&uuid, ZMK_BT_UUID_SPLIT_POS_STATE, sizeof(uuid)); + discover_params.uuid = &uuid.uuid; + discover_params.start_handle = attr->handle + 1; + discover_params.type = BT_GATT_DISCOVER_CHARACTERISTIC; + + err = bt_gatt_discover(conn, &discover_params); + if (err) { + LOG_ERR("Discover failed (err %d)", err); + } + } else if (!bt_uuid_cmp(discover_params.uuid, + ZMK_BT_UUID_SPLIT_POS_STATE)) { + memcpy(&uuid, BT_UUID_GATT_CCC, sizeof(uuid)); + discover_params.uuid = &uuid.uuid; + discover_params.start_handle = attr->handle + 2; + discover_params.type = BT_GATT_DISCOVER_DESCRIPTOR; + subscribe_params.value_handle = bt_gatt_attr_value_handle(attr); + + err = bt_gatt_discover(conn, &discover_params); + if (err) { + LOG_ERR("Discover failed (err %d)", err); + } + } else { + subscribe_params.notify = notify_func; + subscribe_params.value = BT_GATT_CCC_NOTIFY; + subscribe_params.ccc_handle = attr->handle; + + err = bt_gatt_subscribe(conn, &subscribe_params); + if (err && err != -EALREADY) { + LOG_ERR("Subscribe failed (err %d)", err); + } else { + LOG_DBG("[SUBSCRIBED]"); + } + + return BT_GATT_ITER_STOP; + } + + return BT_GATT_ITER_STOP; +} + +static bool eir_found(struct bt_data *data, void *user_data) +{ + bt_addr_le_t *addr = user_data; + int i; + + LOG_DBG("[AD]: %u data_len %u", data->type, data->data_len); + + switch (data->type) { + case BT_DATA_UUID128_SOME: + case BT_DATA_UUID128_ALL: + if (data->data_len % 16 != 0U) { + LOG_ERR("AD malformed"); + return true; + } + + for (i = 0; i < data->data_len; i += 16) { + struct bt_le_conn_param *param; + struct bt_uuid uuid; + int err; + + if (!bt_uuid_create(&uuid, &data->data[i], 16)) { + LOG_ERR("Unable to load UUID"); + continue; + } + + if (bt_uuid_cmp(&uuid, ZMK_BT_UUID_SPLIT)) { + continue; + } + + err = bt_le_scan_stop(); + if (err) { + LOG_ERR("Stop LE scan failed (err %d)", err); + continue; + } + + param = BT_LE_CONN_PARAM_DEFAULT; + err = bt_conn_le_create(addr, BT_CONN_LE_CREATE_CONN, + param, &default_conn); + if (err) { + LOG_ERR("Create conn failed (err %d)", err); + start_scan(); + } + + return false; + } + } + + return true; +} + +static void device_found(const bt_addr_le_t *addr, s8_t rssi, u8_t type, + struct net_buf_simple *ad) +{ + char dev[BT_ADDR_LE_STR_LEN]; + + bt_addr_le_to_str(addr, dev, sizeof(dev)); + LOG_DBG("[DEVICE]: %s, AD evt type %u, AD data len %u, RSSI %i", + dev, type, ad->len, rssi); + + /* We're only interested in connectable events */ + if (type == BT_GAP_ADV_TYPE_ADV_IND || + type == BT_GAP_ADV_TYPE_ADV_DIRECT_IND) { + bt_data_parse(ad, eir_found, (void *)addr); + } +} + +static int start_scan(void) +{ + int err; + + err = bt_le_scan_start(BT_LE_SCAN_PASSIVE, device_found); + if (err) { + LOG_ERR("Scanning failed to start (err %d)", err); + return err; + } + + LOG_DBG("Scanning successfully started"); + return 0; +} + +static void connected(struct bt_conn *conn, u8_t conn_err) +{ + char addr[BT_ADDR_LE_STR_LEN]; + int err; + + bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr)); + + if (conn_err) { + LOG_ERR("Failed to connect to %s (%u)", addr, conn_err); + + bt_conn_unref(default_conn); + default_conn = NULL; + + start_scan(); + return; + } + + LOG_DBG("Connected: %s", addr); + + if (conn == default_conn) { + memcpy(&uuid, BT_UUID_HRS, sizeof(uuid)); + discover_params.uuid = &uuid.uuid; + discover_params.func = discover_func; + discover_params.start_handle = 0x0001; + discover_params.end_handle = 0xffff; + discover_params.type = BT_GATT_DISCOVER_PRIMARY; + + err = bt_gatt_discover(default_conn, &discover_params); + if (err) { + LOG_ERR("Discover failed(err %d)", err); + return; + } + } +} + +static void disconnected(struct bt_conn *conn, u8_t reason) +{ + char addr[BT_ADDR_LE_STR_LEN]; + + bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr)); + + LOG_DBG("Disconnected: %s (reason 0x%02x)", addr, reason); + + if (default_conn != conn) { + return; + } + + bt_conn_unref(default_conn); + default_conn = NULL; + + start_scan(); +} + +static struct bt_conn_cb conn_callbacks = { + .connected = connected, + .disconnected = disconnected, +}; + +int zmk_split_bt_central_init() +{ + bt_conn_cb_register(&conn_callbacks); + + return start_scan(); +} diff --git a/app/src/split/bluetooth/service.c b/app/src/split/bluetooth/service.c index a669723..81fbfb5 100644 --- a/app/src/split/bluetooth/service.c +++ b/app/src/split/bluetooth/service.c @@ -4,6 +4,7 @@ #include <bluetooth/gatt.h> #include <zmk/matrix.h> +#include <zmk/split/bluetooth/uuid.h> #include <zmk/split/bluetooth/service.h> static u8_t num_of_positions = ZMK_KEYMAP_LEN; |