michaelh/zephyr
1
0
Fork 0
Code Releases Activity

Bluetooth: GATT: Implement Client Supported Features

Browse source 
The Client Supported Features characteristic is used by the client to
inform the server which features are supported by the client.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2019-01-31 17:05:05 +02:00 • committed by Johan Hedberg
commit ad9846b928
1 changed files with 108 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

108
subsys/bluetooth/host/gatt.c
View file

@ -167,6 +167,108 @@ static void sc_ccc_cfg_changed(const struct bt_gatt_attr *attr,
BT_DBG("value 0x%04x", value);
}
struct gatt_cf_cfg {
u8_t id;
bt_addr_le_t peer;
u8_t data[1];
};
#if defined(CONFIG_BT_GATT_CACHING)
#define CF_CFG_MAX (CONFIG_BT_MAX_PAIRED + CONFIG_BT_MAX_CONN)
static struct gatt_cf_cfg cf_cfg[CF_CFG_MAX] = {};
static struct gatt_cf_cfg *find_cf_cfg(const bt_addr_le_t *addr)
{
int i;
for (i = 0; i < ARRAY_SIZE(cf_cfg); i++) {
if (!bt_addr_le_cmp(&cf_cfg[i].peer, addr)) {
return &cf_cfg[i];
}
}
return NULL;
}
static ssize_t cf_read(struct bt_conn *conn, const struct bt_gatt_attr *attr,
void *buf, u16_t len, u16_t offset)
{
struct gatt_cf_cfg *cfg;
u8_t data[1] = {};
cfg = find_cf_cfg(&conn->le.dst);
if (cfg) {
memcpy(data, cfg->data, sizeof(data));
}
return bt_gatt_attr_read(conn, attr, buf, len, offset, data,
sizeof(data));
}
static bool cf_set_value(struct gatt_cf_cfg *cfg, const u8_t *value, u16_t len)
{
u16_t i;
/* Validate the bits */
for (i = 0; i < len; i++) {
u8_t chg_bits = value[i] ^ cfg->data[i];
u8_t bit;
for (bit = 0; bit < 8; bit++) {
/* A client shall never clear a bit it has set */
if ((BIT(bit) & chg_bits) &&
(BIT(bit) & cfg->data[i])) {
return false;
}
}
}
/* Set the bits for each octect */
for (i = 0; i < len; i++) {
cfg->data[i] |= value[i];
BT_DBG("byte %u: data 0x%02x value 0x%02x", i, cfg->data[i],
value[i]);
}
return true;
}
static ssize_t cf_write(struct bt_conn *conn, const struct bt_gatt_attr *attr,
const void *buf, u16_t len, u16_t offset, u8_t flags)
{
struct gatt_cf_cfg *cfg;
const u8_t *value = buf;
if (offset > sizeof(cfg->data)) {
return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET);
}
if (offset + len > sizeof(cfg->data)) {
return BT_GATT_ERR(BT_ATT_ERR_INVALID_ATTRIBUTE_LEN);
}
cfg = find_cf_cfg(&conn->le.dst);
if (!cfg) {
cfg = find_cf_cfg(BT_ADDR_LE_ANY);
}
if (!cfg) {
BT_WARN("No space to store Client Supported Features");
return BT_GATT_ERR(BT_ATT_ERR_INSUFFICIENT_RESOURCES);
}
BT_DBG("handle 0x%04x len %u", attr->handle, len);
if (!cf_set_value(cfg, value, len)) {
return BT_GATT_ERR(BT_ATT_ERR_VALUE_NOT_ALLOWED);
}
bt_addr_le_copy(&cfg->peer, &conn->le.dst);
return len;
}
#endif /* COFNIG_BT_GATT_CACHING */
static struct bt_gatt_attr gatt_attrs[] = {
BT_GATT_PRIMARY_SERVICE(BT_UUID_GATT),
/* Bluetooth 5.0, Vol3 Part G:
@ -177,6 +279,12 @@ static struct bt_gatt_attr gatt_attrs[] = {
BT_GATT_CHARACTERISTIC(BT_UUID_GATT_SC, BT_GATT_CHRC_INDICATE,
BT_GATT_PERM_NONE, NULL, NULL, NULL),
BT_GATT_CCC(sc_ccc_cfg, sc_ccc_cfg_changed),
#if defined(CONFIG_BT_GATT_CACHING)
BT_GATT_CHARACTERISTIC(BT_UUID_GATT_CLIENT_FEATURES,
BT_GATT_CHRC_READ | BT_GATT_CHRC_WRITE,
BT_GATT_PERM_READ | BT_GATT_PERM_WRITE,
cf_read, cf_write, NULL),
#endif /* COFNIG_BT_GATT_CACHING */
};
static struct bt_gatt_service gatt_svc = BT_GATT_SERVICE(gatt_attrs);