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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 "phy_cent.h"
static const char *tag = "NimBLE_BLE_PHY_CENT";
static int blecent_gap_event(struct ble_gap_event *event, void *arg);
static uint8_t peer_addr[6];
static ble_addr_t conn_addr;
static void blecent_scan(void);
static uint8_t s_current_phy;
void ble_store_config_init(void);
/**
* Performs GATT operation against the specified peer:
* 1. Reads the Supported LE PHY characteristic.
* 2. After read is completed, performs write blob
*
* If the peer does not support a required service, characteristic, or
* descriptor, then the peer lied when it claimed support for the LE
* PHY service! When this happens, or if a GATT procedure fails,
* this function immediately terminates the connection.
*/
static int
blecent_on_write(uint16_t conn_handle,
const struct ble_gatt_error *error,
struct ble_gatt_attr *attr,
void *arg)
{
MODLOG_DFLT(INFO, "Write complete; status=%d conn_handle=%d", error->status,
conn_handle);
if (error->status == 0) {
MODLOG_DFLT(INFO, " attr_handle=%d", attr->handle);
}
/* Terminate the connection once GATT procedure is completed */
ble_gap_terminate(conn_handle, BLE_ERR_REM_USER_CONN_TERM);
MODLOG_DFLT(INFO, "\n");
return 0;
}
static int
blecent_on_read(uint16_t conn_handle,
const struct ble_gatt_error *error,
struct ble_gatt_attr *attr,
void *arg)
{
MODLOG_DFLT(INFO, "Read complete; status=%d conn_handle=%d", error->status,
conn_handle);
if (error->status == 0) {
MODLOG_DFLT(INFO, " attr_handle=%d value=", attr->handle);
print_mbuf(attr->om);
}
MODLOG_DFLT(INFO, "\n");
/* Write 1000 bytes to the LE PHY characteristic.*/
const struct peer_chr *chr;
int len = 1000;
uint8_t value[len];
int rc;
struct os_mbuf *txom;
const struct peer *peer = peer_find(conn_handle);
chr = peer_chr_find_uuid(peer,
BLE_UUID16_DECLARE(LE_PHY_UUID16),
BLE_UUID16_DECLARE(LE_PHY_CHR_UUID16));
if (chr == NULL) {
MODLOG_DFLT(ERROR, "Error: Peer doesn't support the Alert "
"Notification Control Point characteristic\n");
goto err;
}
/* Fill the value array with data */
for (int i = 0; i < len; i++) {
value[i] = i;
}
txom = ble_hs_mbuf_from_flat(&value, len);
if (!txom) {
MODLOG_DFLT(ERROR, "Insufficient memory");
goto err;
}
rc = ble_gattc_write_long(conn_handle, chr->chr.val_handle, 0,
txom, blecent_on_write, NULL);
if (rc != 0) {
MODLOG_DFLT(ERROR, "Error: Failed to write characteristic; rc=%d\n",
rc);
goto err;
}
return 0;
err:
/* Terminate the connection. */
return ble_gap_terminate(peer->conn_handle, BLE_ERR_REM_USER_CONN_TERM);
}
static void
blecent_read(const struct peer *peer)
{
const struct peer_chr *chr;
int rc;
/* Read the supported-new-alert-category characteristic. */
chr = peer_chr_find_uuid(peer,
BLE_UUID16_DECLARE(LE_PHY_UUID16),
BLE_UUID16_DECLARE(LE_PHY_CHR_UUID16));
if (chr == NULL) {
MODLOG_DFLT(ERROR, "Error: Peer doesn't support the Supported "
"LE PHY characteristic\n");
goto err;
}
rc = ble_gattc_read(peer->conn_handle, chr->chr.val_handle,
blecent_on_read, NULL);
if (rc != 0) {
MODLOG_DFLT(ERROR, "Error: Failed to read characteristic; rc=%d\n",
rc);
goto err;
}
return;
err:
/* Terminate the connection. */
ble_gap_terminate(peer->conn_handle, BLE_ERR_REM_USER_CONN_TERM);
}
/**
* Called when service discovery of the specified peer has completed.
*/
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 perform GATT procedure against the peer: read
*/
blecent_read(peer);
}
/* Set default LE PHY before establishing connection */
void set_default_le_phy(uint8_t tx_phys_mask, uint8_t rx_phys_mask)
{
int rc = ble_gap_set_prefered_default_le_phy(tx_phys_mask, rx_phys_mask);
if (rc == 0) {
MODLOG_DFLT(INFO, "Default LE PHY set successfully; tx_phy = %d, rx_phy = %d",
tx_phys_mask, rx_phys_mask);
} else {
MODLOG_DFLT(ERROR, "Failed to set default LE PHY");
}
}
/**
* 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 LE PHY service.
*/
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 LE PHY UUID (0xABF2).
*/
do {
ad_struct_len = disc->data[offset];
if (!ad_struct_len) {
break;
}
/* Search if LE PHY UUID is advertised */
if (disc->data[offset] == 0x03 && disc->data[offset + 1] == 0x03) {
if ( disc->data[offset + 2] == 0xAB && disc->data[offset + 3] == 0xF2 ) {
return 1;
}
}
offset += ad_struct_len + 1;
} while ( offset < disc->length_data );
return 0;
}
/**
* Connects to the sender of the specified advertisement of it looks
* interesting. A device is "interesting" if it advertises connectability and
* support for the LE PHY 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 (!ext_blecent_should_connect((struct ble_gap_ext_disc_desc *)disc)) {
return;
}
#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;
}
addr = &((struct ble_gap_ext_disc_desc *)disc)->addr;
/* Copy addr information for next connection */
memcpy(&conn_addr, addr, sizeof(conn_addr));
MODLOG_DFLT(INFO, "Attempting to connect to : %x %x %x %x %x %x with type %d \n",
conn_addr.val[5],conn_addr.val[4], conn_addr.val[3], conn_addr.val[2], conn_addr.val[1], conn_addr.val[0],
conn_addr.type);
/* Try to connect the the advertiser. Allow 30 seconds (30000 ms) for
* timeout.
*/
rc = ble_gap_connect(own_addr_type, &conn_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",
conn_addr.type, addr_str(conn_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;
int rc;
switch (event->type) {
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. */
switch (s_current_phy) {
case BLE_HCI_LE_PHY_1M_PREF_MASK:
MODLOG_DFLT(INFO,"Connection established on 1M Phy");
break;
case BLE_HCI_LE_PHY_2M_PREF_MASK:
case BLE_HCI_LE_PHY_1M_PREF_MASK | BLE_HCI_LE_PHY_2M_PREF_MASK:
MODLOG_DFLT(INFO,"Connection established on 2M Phy");
break;
case BLE_HCI_LE_PHY_CODED_PREF_MASK:
MODLOG_DFLT(INFO,"Connection established on Coded Phy");
break;
}
rc = ble_gap_conn_find(event->link_estab.conn_handle, &desc);
assert(rc == 0);
print_conn_desc(&desc);
MODLOG_DFLT(INFO, "\n");
/* 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,
blecent_on_disc_complete, 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);
switch (s_current_phy) {
case BLE_HCI_LE_PHY_1M_PREF_MASK:
/* Setting current phy to create connection on 2M PHY */
s_current_phy = BLE_HCI_LE_PHY_2M_PREF_MASK;
break;
case BLE_HCI_LE_PHY_2M_PREF_MASK:
/* Setting current phy to create connection on CODED PHY */
s_current_phy = BLE_HCI_LE_PHY_CODED_PREF_MASK;
break;
case BLE_HCI_LE_PHY_CODED_PREF_MASK:
return 0;
}
vTaskDelay(200);
/* Attempt direct connection on 2M or Coded phy now */
if (s_current_phy == BLE_HCI_LE_PHY_CODED_PREF_MASK) {
MODLOG_DFLT(INFO, " Attempting to initiate connection on Coded PHY \n");
ble_gap_ext_connect(0, &conn_addr, 30000, BLE_HCI_LE_PHY_CODED_PREF_MASK,
NULL, NULL, NULL, blecent_gap_event, NULL);
}
else if (s_current_phy == BLE_HCI_LE_PHY_2M_PREF_MASK) {
MODLOG_DFLT(INFO, " Attempting to initiate connection on 2M PHY \n");
ble_gap_ext_connect(0, &conn_addr, 30000, (BLE_HCI_LE_PHY_1M_PREF_MASK | BLE_HCI_LE_PHY_2M_PREF_MASK),
NULL, NULL, NULL, blecent_gap_event, NULL);
}
return 0;
case BLE_GAP_EVENT_DISC_COMPLETE:
MODLOG_DFLT(INFO, "discovery complete; reason=%d\n",
event->disc_complete.reason);
return 0;
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;
default:
return 0;
}
}
static void
blecent_on_reset(int reason)
{
MODLOG_DFLT(ERROR, "Resetting state; reason=%d\n", reason);
}
static void
blecent_on_sync(void)
{
int ii, rc;
uint8_t all_phy;
/* Make sure we have proper identity address set (public preferred) */
rc = ble_hs_util_ensure_addr(0);
assert(rc == 0);
s_current_phy = BLE_HCI_LE_PHY_1M_PREF_MASK;
all_phy = BLE_HCI_LE_PHY_1M_PREF_MASK | BLE_HCI_LE_PHY_2M_PREF_MASK | BLE_HCI_LE_PHY_CODED_PREF_MASK;
set_default_le_phy(all_phy, all_phy);
if (s_current_phy != BLE_HCI_LE_PHY_1M_PREF_MASK) {
/* Check if peer address is set in EXAMPLE_PEER_ADDR */
if (strlen(CONFIG_EXAMPLE_PEER_ADDR) &&
(strncmp(CONFIG_EXAMPLE_PEER_ADDR, "ADDR_ANY", strlen("ADDR_ANY")) != 0)) {
/* User wants to connect on 2M or coded phy directly */
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]);
for(ii = 0 ;ii < 6; ii++)
conn_addr.val[ii] = peer_addr[ii];
conn_addr.type = 0;
vTaskDelay(300);
if (s_current_phy == BLE_HCI_LE_PHY_2M_PREF_MASK)
s_current_phy = BLE_HCI_LE_PHY_1M_PREF_MASK | BLE_HCI_LE_PHY_2M_PREF_MASK ;
ble_gap_ext_connect(0, &conn_addr, 30000, s_current_phy,
NULL, NULL, NULL, blecent_gap_event, NULL);
}
}
else {
/* 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();
if (ret != ESP_OK) {
MODLOG_DFLT(ERROR, "Failed to init nimble %d \n", ret);
return;
}
/* 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;
/* 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-phy");
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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