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/*
* SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
#include "esp_log.h"
#include "nvs_flash.h"
/* BLE */
#include "nimble/nimble_port.h"
#include "nimble/nimble_port_freertos.h"
#include "host/ble_hs.h"
#include "host/util/util.h"
#include "console/console.h"
#include "services/gap/ble_svc_gap.h"
#include "coc_blecent.h"
static const char *tag = "NimBLE_BLE_CENT_L2CAP_COC";
static int blecent_gap_event(struct ble_gap_event *event, void *arg);
static uint8_t peer_addr[6];
void ble_store_config_init(void);
#if MYNEWT_VAL(BLE_L2CAP_COC_MAX_NUM) >= 1
#define COC_BUF_COUNT (3 * MYNEWT_VAL(BLE_L2CAP_COC_MAX_NUM))
#define L2CAP_COC_UUID 0x1812
#define MTU 512
static uint16_t conn_handle_coc ;
static os_membuf_t sdu_coc_mem[OS_MEMPOOL_SIZE(COC_BUF_COUNT, MTU * 2)];
static struct os_mempool sdu_coc_mbuf_mempool;
static struct os_mbuf_pool sdu_os_mbuf_pool;
static int blecent_l2cap_coc_event_cb(struct ble_l2cap_event *event, void *arg);
struct ble_l2cap_chan *coc_chan = NULL;
/**
* This API is used to send data over L2CAP connection oriented channel.
*/
static void
blecent_l2cap_coc_send_data(struct ble_l2cap_chan *chan)
{
struct os_mbuf *sdu_rx_data;
int rc = 0;
int len = 512;
uint8_t value[len];
for (int i = 0; i < len; i++) {
value[i] = i;
}
do {
sdu_rx_data = os_mbuf_get_pkthdr(&sdu_os_mbuf_pool, 0);
if (sdu_rx_data == NULL) {
vTaskDelay(10 / portTICK_PERIOD_MS);
sdu_rx_data = os_mbuf_get_pkthdr(&sdu_os_mbuf_pool, 0);
}
} while (sdu_rx_data == NULL);
os_mbuf_append(sdu_rx_data, value, len);
print_mbuf_data(sdu_rx_data);
rc = ble_l2cap_send(chan, sdu_rx_data);
while (rc == BLE_HS_ESTALLED) {
vTaskDelay(100 / portTICK_PERIOD_MS);
rc = ble_l2cap_send(chan, sdu_rx_data);
}
if (rc == 0) {
MODLOG_DFLT(INFO, "Data sent successfully");
} else {
MODLOG_DFLT(INFO, "Data sending failed, rc = %d", rc);
os_mbuf_free_chain(sdu_rx_data);
}
}
/**
* After connection is established on GAP layer, service discovery is performed. On
* it's completion, this API is called for making a connection is on L2CAP layer.
*/
static void
blecent_l2cap_coc_on_disc_complete(const struct peer *peer, int status, void *arg)
{
uint16_t psm = 0x1002;
struct os_mbuf *sdu_rx;
sdu_rx = os_mbuf_get_pkthdr(&sdu_os_mbuf_pool, 0);
ble_l2cap_connect(conn_handle_coc, psm, MTU, sdu_rx, blecent_l2cap_coc_event_cb,
NULL);
}
/**
* The nimble host executes this callback when a L2CAP event occurs. The
* application associates a L2CAP event callback with each connection that is
* established. blecent_l2cap_coc uses the same callback for all connections.
*
* @param event The event being signalled.
* @param arg Application-specified argument; unused by
* blecent_l2cap_coc.
*
* @return 0 if the application successfully handled the
* event; nonzero on failure. The semantics
* of the return code is specific to the
* particular L2CAP event being signalled.
*/
static int
blecent_l2cap_coc_event_cb(struct ble_l2cap_event *event, void *arg)
{
struct ble_l2cap_chan_info chan_info;
switch (event->type) {
case BLE_L2CAP_EVENT_COC_CONNECTED:
if (event->connect.status) {
console_printf("LE COC error: %d\n", event->connect.status);
return 0;
}
if (ble_l2cap_get_chan_info(event->connect.chan, &chan_info)) {
assert(0);
}
console_printf("LE COC connected, conn: %d, chan: %p, psm: 0x%02x,"
" scid: 0x%04x, ""dcid: 0x%04x, our_mps: %d, our_mtu: %d,"
" peer_mps: %d, peer_mtu: %d\n",
event->connect.conn_handle, event->connect.chan,
chan_info.psm, chan_info.scid, chan_info.dcid,
chan_info.our_l2cap_mtu, chan_info.our_coc_mtu,
chan_info.peer_l2cap_mtu, chan_info.peer_coc_mtu);
coc_chan = event->connect.chan;
return 0;
case BLE_L2CAP_EVENT_COC_DISCONNECTED:
console_printf("LE CoC disconnected, chan: %p\n",
event->disconnect.chan);
return 0;
default:
return 0;
}
}
static void
blecent_l2cap_coc_mem_init(void)
{
int rc;
rc = os_mempool_init(&sdu_coc_mbuf_mempool, COC_BUF_COUNT, MTU, sdu_coc_mem,
"coc_sdu_pool");
assert(rc == 0);
rc = os_mbuf_pool_init(&sdu_os_mbuf_pool, &sdu_coc_mbuf_mempool, MTU,
COC_BUF_COUNT);
assert(rc == 0);
}
#endif // #if MYNEWT_VAL(BLE_L2CAP_COC_MAX_NUM) >= 1
/**
* Called when service discovery of the specified peer has completed.
*/
#if MYNEWT_VAL(BLE_L2CAP_COC_MAX_NUM) < 1
static void
blecent_on_disc_complete(const struct peer *peer, int status, void *arg)
{
if (status != 0) {
/* Service discovery failed. Terminate the connection. */
MODLOG_DFLT(ERROR, "Error: Service discovery failed; status=%d "
"conn_handle=%d\n", status, peer->conn_handle);
ble_gap_terminate(peer->conn_handle, BLE_ERR_REM_USER_CONN_TERM);
return;
}
/* Service discovery has completed successfully. Now we have a complete
* list of services, characteristics, and descriptors that the peer
* supports.
*/
MODLOG_DFLT(INFO, "Service discovery complete; status=%d "
"conn_handle=%d\n", status, peer->conn_handle);
/* Now user can perform GATT procedures against the peer: read,
* write, and subscribe to notifications.
*/
}
#endif
/**
* Initiates the GAP general discovery procedure.
*/
static void
blecent_scan(void)
{
uint8_t own_addr_type;
struct ble_gap_disc_params disc_params;
int rc;
/* Figure out address to use while advertising (no privacy for now) */
rc = ble_hs_id_infer_auto(0, &own_addr_type);
if (rc != 0) {
MODLOG_DFLT(ERROR, "error determining address type; rc=%d\n", rc);
return;
}
/* Tell the controller to filter duplicates; we don't want to process
* repeated advertisements from the same device.
*/
disc_params.filter_duplicates = 1;
/**
* Perform a passive scan. I.e., don't send follow-up scan requests to
* each advertiser.
*/
disc_params.passive = 1;
/* Use defaults for the rest of the parameters. */
disc_params.itvl = 0;
disc_params.window = 0;
disc_params.filter_policy = 0;
disc_params.limited = 0;
rc = ble_gap_disc(own_addr_type, BLE_HS_FOREVER, &disc_params,
blecent_gap_event, NULL);
if (rc != 0) {
MODLOG_DFLT(ERROR, "Error initiating GAP discovery procedure; rc=%d\n",
rc);
}
}
/**
* Indicates whether we should try to connect to the sender of the specified
* advertisement. The function returns a positive result if the device
* advertises connectability and support for the Alert Notification service.
*/
#if CONFIG_EXAMPLE_EXTENDED_ADV
static int
ext_blecent_should_connect(const struct ble_gap_ext_disc_desc *disc)
{
int offset = 0;
int ad_struct_len = 0;
if (disc->legacy_event_type != BLE_HCI_ADV_RPT_EVTYPE_ADV_IND &&
disc->legacy_event_type != BLE_HCI_ADV_RPT_EVTYPE_DIR_IND) {
return 0;
}
if (strlen(CONFIG_EXAMPLE_PEER_ADDR) &&
(strncmp(CONFIG_EXAMPLE_PEER_ADDR, "ADDR_ANY", strlen("ADDR_ANY")) != 0)) {
ESP_LOGI(tag, "Peer address from menuconfig: %s", CONFIG_EXAMPLE_PEER_ADDR);
/* Convert string to address */
sscanf(CONFIG_EXAMPLE_PEER_ADDR, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&peer_addr[5], &peer_addr[4], &peer_addr[3],
&peer_addr[2], &peer_addr[1], &peer_addr[0]);
if (memcmp(peer_addr, disc->addr.val, sizeof(disc->addr.val)) != 0) {
return 0;
}
}
/* The device has to advertise support for L2CAP COC UUID (0x1812).
*/
do {
ad_struct_len = disc->data[offset];
if (!ad_struct_len) {
break;
}
/* Search if ANS UUID is advertised */
if (disc->data[offset] == 0x03 && disc->data[offset + 1] == 0x03) {
if ( disc->data[offset + 2] == 0x18 && disc->data[offset + 3] == 0x12 ) {
return 1;
}
}
offset += ad_struct_len + 1;
} while ( offset < disc->length_data );
return 0;
}
#else
static int
blecent_should_connect(const struct ble_gap_disc_desc *disc)
{
struct ble_hs_adv_fields fields;
int rc;
int i;
/* The device has to be advertising connectability. */
if (disc->event_type != BLE_HCI_ADV_RPT_EVTYPE_ADV_IND &&
disc->event_type != BLE_HCI_ADV_RPT_EVTYPE_DIR_IND) {
return 0;
}
rc = ble_hs_adv_parse_fields(&fields, disc->data, disc->length_data);
if (rc != 0) {
return 0;
}
if (strlen(CONFIG_EXAMPLE_PEER_ADDR) &&
(strncmp(CONFIG_EXAMPLE_PEER_ADDR, "ADDR_ANY", strlen("ADDR_ANY")) != 0)) {
MODLOG_DFLT(INFO, "Peer address from menuconfig:%s", CONFIG_EXAMPLE_PEER_ADDR);
/* Convert string to address */
sscanf(CONFIG_EXAMPLE_PEER_ADDR, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&peer_addr[5], &peer_addr[4], &peer_addr[3],
&peer_addr[2], &peer_addr[1], &peer_addr[0]);
if (memcmp(peer_addr, disc->addr.val, sizeof(disc->addr.val)) != 0) {
return 0;
}
}
/* The device has to advertise support for L2CAP COC UUID (0x1812).
*/
for (i = 0; i < fields.num_uuids16; i++) {
if (ble_uuid_u16(&fields.uuids16[i].u) == 0x1812) {
return 1;
}
}
return 0;
}
#endif
/**
* Connects to the sender of the specified advertisement if it looks
* interesting. A device is "interesting" if it advertises connectability and
* support for the Alert Notification service.
*/
static void
blecent_connect_if_interesting(void *disc)
{
uint8_t own_addr_type;
int rc;
ble_addr_t *addr;
/* Don't do anything if we don't care about this advertiser. */
#if CONFIG_EXAMPLE_EXTENDED_ADV
if (!ext_blecent_should_connect((struct ble_gap_ext_disc_desc *)disc)) {
return;
}
#else
if (!blecent_should_connect((struct ble_gap_disc_desc *)disc)) {
return;
}
#endif
#if !(MYNEWT_VAL(BLE_HOST_ALLOW_CONNECT_WITH_SCAN))
/* Scanning must be stopped before a connection can be initiated. */
rc = ble_gap_disc_cancel();
if (rc != 0) {
MODLOG_DFLT(DEBUG, "Failed to cancel scan; rc=%d\n", rc);
return;
}
#endif
/* Figure out address to use for connect (no privacy for now) */
rc = ble_hs_id_infer_auto(0, &own_addr_type);
if (rc != 0) {
MODLOG_DFLT(ERROR, "error determining address type; rc=%d\n", rc);
return;
}
/* Try to connect the the advertiser. Allow 30 seconds (30000 ms) for
* timeout.
*/
#if CONFIG_EXAMPLE_EXTENDED_ADV
addr = &((struct ble_gap_ext_disc_desc *)disc)->addr;
#else
addr = &((struct ble_gap_disc_desc *)disc)->addr;
#endif
rc = ble_gap_connect(own_addr_type, addr, 30000, NULL,
blecent_gap_event, NULL);
if (rc != 0) {
MODLOG_DFLT(ERROR, "Error: Failed to connect to device; addr_type=%d "
"addr=%s; rc=%d\n",
addr->type, addr_str(addr->val), rc);
return;
}
}
/**
* The nimble host executes this callback when a GAP event occurs. The
* application associates a GAP event callback with each connection that is
* established. blecent uses the same callback for all connections.
*
* @param event The event being signalled.
* @param arg Application-specified argument; unused by
* blecent.
*
* @return 0 if the application successfully handled the
* event; nonzero on failure. The semantics
* of the return code is specific to the
* particular GAP event being signalled.
*/
static int
blecent_gap_event(struct ble_gap_event *event, void *arg)
{
struct ble_gap_conn_desc desc;
struct ble_hs_adv_fields fields;
int rc;
peer_disc_fn *disc_cb = NULL;
switch (event->type) {
case BLE_GAP_EVENT_DISC:
rc = ble_hs_adv_parse_fields(&fields, event->disc.data,
event->disc.length_data);
if (rc != 0) {
return 0;
}
/* An advertisement report was received during GAP discovery. */
print_adv_fields(&fields);
/* Try to connect to the advertiser if it looks interesting. */
blecent_connect_if_interesting(&event->disc);
return 0;
case BLE_GAP_EVENT_LINK_ESTAB:
/* A new connection was established or a connection attempt failed. */
if (event->link_estab.status == 0) {
/* Connection successfully established. */
MODLOG_DFLT(INFO, "Connection established ");
rc = ble_gap_conn_find(event->link_estab.conn_handle, &desc);
assert(rc == 0);
print_conn_desc(&desc);
MODLOG_DFLT(INFO, "\n");
#if MYNEWT_VAL(BLE_L2CAP_COC_MAX_NUM) >= 1
conn_handle_coc = event->link_estab.conn_handle;
disc_cb = blecent_l2cap_coc_on_disc_complete;
#else
disc_cb = blecent_on_disc_complete;
#endif
/* Remember peer. */
rc = peer_add(event->link_estab.conn_handle);
if (rc != 0) {
MODLOG_DFLT(ERROR, "Failed to add peer; rc=%d\n", rc);
return 0;
}
/* Perform service discovery. */
rc = peer_disc_all(event->link_estab.conn_handle,
disc_cb, NULL);
if (rc != 0) {
MODLOG_DFLT(ERROR, "Failed to discover services; rc=%d\n", rc);
return 0;
}
} else {
/* Connection attempt failed; resume scanning. */
MODLOG_DFLT(ERROR, "Error: Connection failed; status=%d\n",
event->link_estab.status);
blecent_scan();
}
return 0;
case BLE_GAP_EVENT_DISCONNECT:
/* Connection terminated. */
MODLOG_DFLT(INFO, "disconnect; reason=%d ", event->disconnect.reason);
print_conn_desc(&event->disconnect.conn);
MODLOG_DFLT(INFO, "\n");
/* Forget about peer. */
peer_delete(event->disconnect.conn.conn_handle);
/* Resume scanning. */
blecent_scan();
return 0;
case BLE_GAP_EVENT_DISC_COMPLETE:
MODLOG_DFLT(INFO, "discovery complete; reason=%d\n",
event->disc_complete.reason);
return 0;
#if CONFIG_EXAMPLE_EXTENDED_ADV
case BLE_GAP_EVENT_EXT_DISC:
/* An advertisement report was received during GAP discovery. */
ext_print_adv_report(&event->disc);
blecent_connect_if_interesting(&event->disc);
return 0;
#endif
default:
return 0;
}
}
void
ble_coc_cent_task(void *pvParameters)
{
while (1) {
if (coc_chan) {
for (int i = 0; i < 5; i++) {
blecent_l2cap_coc_send_data(coc_chan);
vTaskDelay(500 / portTICK_PERIOD_MS);
}
coc_chan = NULL;
}
vTaskDelay(1000 / portTICK_PERIOD_MS);
}
}
static void
blecent_on_reset(int reason)
{
MODLOG_DFLT(ERROR, "Resetting state; reason=%d\n", reason);
}
static void
blecent_on_sync(void)
{
int rc;
/* Make sure we have proper identity address set (public preferred) */
rc = ble_hs_util_ensure_addr(0);
assert(rc == 0);
/* Begin scanning for a peripheral to connect to. */
blecent_scan();
}
void blecent_host_task(void *param)
{
ESP_LOGI(tag, "BLE Host Task Started");
/* This function will return only when nimble_port_stop() is executed */
nimble_port_run();
nimble_port_freertos_deinit();
}
void
app_main(void)
{
int rc;
/* Initialize NVS — it is used to store PHY calibration data */
esp_err_t ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK(ret);
ret = nimble_port_init();
assert(ret == 0);
/* Configure the host. */
ble_hs_cfg.reset_cb = blecent_on_reset;
ble_hs_cfg.sync_cb = blecent_on_sync;
ble_hs_cfg.store_status_cb = ble_store_util_status_rr;
#if MYNEWT_VAL(BLE_L2CAP_COC_MAX_NUM) >= 1
blecent_l2cap_coc_mem_init();
xTaskCreate(ble_coc_cent_task, "ble_coc_cent_task", 4096, NULL, 10, NULL);
#endif
/* Initialize data structures to track connected peers. */
rc = peer_init(MYNEWT_VAL(BLE_MAX_CONNECTIONS), 64, 64, 64);
assert(rc == 0);
/* Set the default device name. */
rc = ble_svc_gap_device_name_set("blecent-l2coc");
assert(rc == 0);
/* XXX Need to have template for store */
ble_store_config_init();
nimble_port_freertos_init(blecent_host_task);
}
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