esp-idf/examples/bluetooth/nimble/ble_spp/spp_client/main/main.c

/*
 * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Unlicense OR CC0-1.0
 */

#include "esp_log.h"
#include "nvs_flash.h"
/* BLE */
#include "esp_nimble_hci.h"
#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 "ble_spp_client.h"

#include "driver/uart.h"
static const char *tag = "NimBLE_SPP_BLE_CENT";
static int ble_spp_client_gap_event(struct ble_gap_event *event, void *arg);
QueueHandle_t spp_common_uart_queue = NULL;
void ble_store_config_init(void);
static bool is_connect = false;
uint16_t connection_handle;
uint16_t attribute_handle;
/* 16 Bit Alert Notification Service UUID */
#define GATT_SVR_SVC_ALERT_UUID                            0x1811

/* 16 Bit SPP Service UUID */
#define GATT_SPP_SVC_UUID                                  0xABF0

/* 16 Bit SPP Service Characteristic UUID */
#define GATT_SPP_CHR_UUID                                  0xABF1

static void
ble_spp_client_set_handles(const struct peer *peer){
	 const struct peer_chr *chr;
	 chr = peer_chr_find_uuid(peer,
                              BLE_UUID16_DECLARE(GATT_SPP_SVC_UUID),
                              BLE_UUID16_DECLARE(GATT_SPP_CHR_UUID));
        connection_handle = peer->conn_handle;
        attribute_handle = chr->chr.val_handle;
}

/**
 * Called when service discovery of the specified peer has completed.
 */
static void
ble_spp_client_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);

     ble_spp_client_set_handles(peer);
}

/**
 * Initiates the GAP general discovery procedure.
 */
static void
ble_spp_client_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,
                      ble_spp_client_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.
 */
static int
ble_spp_client_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 rc;
    }

    /* The device has to advertise support for the Alert Notification
     * service (0x1811).
     */
    for (i = 0; i < fields.num_uuids16; i++) {
        if (ble_uuid_u16(&fields.uuids16[i].u) == GATT_SVR_SVC_ALERT_UUID) {
            return 1;
        }
    }

    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 Alert Notification service.
 */
static void
ble_spp_client_connect_if_interesting(const struct ble_gap_disc_desc *disc)
{
    uint8_t own_addr_type;
    int rc;

    /* Don't do anything if we don't care about this advertiser. */
    if (!ble_spp_client_should_connect(disc)) {
        return;
    }

    /* 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;
    }

    /* 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.
     */

    rc = ble_gap_connect(own_addr_type, &disc->addr, 30000, NULL,
                         ble_spp_client_gap_event, NULL);
    if (rc != 0) {
        MODLOG_DFLT(ERROR, "Error: Failed to connect to device; addr_type=%d "
                    "addr=%s; rc=%d\n",
                    disc->addr.type, addr_str(disc->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.  ble_spp_client uses the same callback for all connections.
 *
 * @param event                 The event being signalled.
 * @param arg                   Application-specified argument; unused by
 *                                  ble_spp_client.
 *
 * @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
ble_spp_client_gap_event(struct ble_gap_event *event, void *arg)
{
    struct ble_gap_conn_desc desc;
    struct ble_hs_adv_fields fields;
    int rc;

    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 advertisment report was received during GAP discovery. */
        print_adv_fields(&fields);

        /* Try to connect to the advertiser if it looks interesting. */
        ble_spp_client_connect_if_interesting(&event->disc);
        return 0;

    case BLE_GAP_EVENT_CONNECT:
	/* A new connection was established or a connection attempt failed. */
        if (event->connect.status == 0) {
            /* Connection successfully established. */
            MODLOG_DFLT(INFO, "Connection established ");
	    is_connect = true;
            rc = ble_gap_conn_find(event->connect.conn_handle, &desc);
            assert(rc == 0);
            print_conn_desc(&desc);
            MODLOG_DFLT(INFO, "\n");

            /* Remember peer. */
            rc = peer_add(event->connect.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->connect.conn_handle,
                               ble_spp_client_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->connect.status);
            ble_spp_client_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. */
        ble_spp_client_scan();
        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_NOTIFY_RX:
        /* Peer sent us a notification or indication. */
        MODLOG_DFLT(INFO, "received %s; conn_handle=%d attr_handle=%d "
                    "attr_len=%d\n",
                    event->notify_rx.indication ?
                    "indication" :
                    "notification",
                    event->notify_rx.conn_handle,
                    event->notify_rx.attr_handle,
                    OS_MBUF_PKTLEN(event->notify_rx.om));

        /* Attribute data is contained in event->notify_rx.om. Use
         * `os_mbuf_copydata` to copy the data received in notification mbuf */
        return 0;

    case BLE_GAP_EVENT_MTU:
        MODLOG_DFLT(INFO, "mtu update event; conn_handle=%d cid=%d mtu=%d\n",
                    event->mtu.conn_handle,
                    event->mtu.channel_id,
                    event->mtu.value);
        return 0;

    default:
        return 0;
    }
}

static void
ble_spp_client_on_reset(int reason)
{
    MODLOG_DFLT(ERROR, "Resetting state; reason=%d\n", reason);
}

static void
ble_spp_client_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. */
    ble_spp_client_scan();
}

void ble_spp_client_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 ble_client_uart_task(void *pvParameters)
{
	ESP_LOGI(tag,"BLE client UART task started\n");
	int rc;
	uart_event_t event;
        for (;;) {
            //Waiting for UART event.
            if (xQueueReceive(spp_common_uart_queue, (void * )&event, (TickType_t)portMAX_DELAY)) {
             switch (event.type) {
             //Event of UART receving data
             case UART_DATA:
                if (event.size && (is_connect == true)) {

                     /* Writing characteristics */
		     uint8_t * temp = NULL;
                     temp = (uint8_t *)malloc(sizeof(uint8_t)*event.size);
                     if(temp == NULL){
                         ESP_LOGE(tag, "malloc failed,%s L#%d\n", __func__, __LINE__);
                         break;
                     }
                     memset(temp, 0x0, event.size);
                     uart_read_bytes(UART_NUM_0,temp,event.size,portMAX_DELAY);
		     rc = ble_gattc_write_flat(connection_handle, attribute_handle,temp, event.size,NULL, NULL);
		     if(rc == 0){
		     	ESP_LOGI(tag,"Write in uart task success!");
		     }
		     else{
		     	ESP_LOGI(tag,"Error in writing characteristic");
		     }
		     free(temp);
		 }
                 break;
             default:
                 break;
             }
         }
     }
     vTaskDelete(NULL);

}
static void ble_spp_uart_init(void)
{
     uart_config_t uart_config = {
         .baud_rate = 115200,
         .data_bits = UART_DATA_8_BITS,
         .parity = UART_PARITY_DISABLE,
         .stop_bits = UART_STOP_BITS_1,
         .flow_ctrl = UART_HW_FLOWCTRL_RTS,
         .rx_flow_ctrl_thresh = 122,
         .source_clk = UART_SCLK_APB,
     };

     //Install UART driver, and get the queue.
     uart_driver_install(UART_NUM_0, 4096, 8192, 10, &spp_common_uart_queue, 0);
     //Set UART parameters
     uart_param_config(UART_NUM_0, &uart_config);
     //Set UART pins
     uart_set_pin(UART_NUM_0, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
     xTaskCreate(ble_client_uart_task, "uTask", 2048, (void*)UART_NUM_0, 8, NULL);
}
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);

    ESP_ERROR_CHECK(esp_nimble_hci_and_controller_init());

    nimble_port_init();

    /* Initialize UART driver and start uart task */
    ble_spp_uart_init();

    /* Configure the host. */
    ble_hs_cfg.reset_cb = ble_spp_client_on_reset;
    ble_hs_cfg.sync_cb = ble_spp_client_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("nimble-ble-spp-client");
    assert(rc == 0);

    /* XXX Need to have template for store */
    ble_store_config_init();

    nimble_port_freertos_init(ble_spp_client_host_task);
}