/* * SPDX-FileCopyrightText: 2018-2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ #include #include #include #include #include #include #include "protocomm_priv.h" #include "simple_ble.h" ESP_EVENT_DEFINE_BASE(PROTOCOMM_TRANSPORT_BLE_EVENT); /* NOTE: For the security2 scheme, the payload size is quite larger * than that for security1. The increased value has been selected * keeping in mind the largest packet size for security2 and the * factors affecting it. */ #if CONFIG_ESP_PROTOCOMM_SUPPORT_SECURITY_VERSION_2 #define CHAR_VAL_LEN_MAX (480 + 1) #else #define CHAR_VAL_LEN_MAX (256 + 1) #endif // CONFIG_ESP_PROTOCOMM_SUPPORT_SECURITY_VERSION_2 #define PREPARE_BUF_MAX_SIZE CHAR_VAL_LEN_MAX static const char *TAG = "protocomm_ble"; /* BLE specific configuration parameters */ static const uint16_t primary_service_uuid = ESP_GATT_UUID_PRI_SERVICE; static const uint16_t character_declaration_uuid = ESP_GATT_UUID_CHAR_DECLARE; static const uint16_t character_user_description = ESP_GATT_UUID_CHAR_DESCRIPTION; static const uint8_t character_prop_read_write = ESP_GATT_CHAR_PROP_BIT_READ | ESP_GATT_CHAR_PROP_BIT_WRITE; static const uint8_t character_prop_read_write_notify = ESP_GATT_CHAR_PROP_BIT_READ | ESP_GATT_CHAR_PROP_BIT_WRITE | \ ESP_GATT_CHAR_PROP_BIT_NOTIFY; typedef struct { uint8_t type; uint8_t length; uint8_t *data_p; } raw_data_info_t; typedef struct { uint8_t *prepare_buf; int prepare_len; uint16_t handle; } prepare_type_env_t; static prepare_type_env_t prepare_write_env; typedef struct name_uuid128 { const char *name; uint8_t uuid128[ESP_UUID_LEN_128]; } name_uuid128_t; typedef struct _protocomm_ble { protocomm_t *pc_ble; name_uuid128_t *g_nu_lookup; ssize_t g_nu_lookup_count; uint16_t gatt_mtu; uint8_t *service_uuid; unsigned ble_link_encryption:1; unsigned ble_notify:1; } _protocomm_ble_internal_t; static _protocomm_ble_internal_t *protoble_internal; // config adv data static esp_ble_adv_data_t adv_config = { .set_scan_rsp = false, .include_txpower = true, .min_interval = 0x0006, //slave connection min interval, Time = min_interval * 1.25 msec .max_interval = 0x0010, //slave connection max interval, Time = max_interval * 1.25 msec .appearance = 0x00, .manufacturer_len = 0, .p_manufacturer_data = NULL, .service_data_len = 0, .p_service_data = NULL, .service_uuid_len = 0, // Filled later .p_service_uuid = NULL, // Filled later .flag = (ESP_BLE_ADV_FLAG_GEN_DISC | ESP_BLE_ADV_FLAG_BREDR_NOT_SPT), }; // config scan response data static esp_ble_adv_data_t scan_rsp_config = { .set_scan_rsp = true, .include_name = true, .manufacturer_len = 0, // Filled later .p_manufacturer_data = NULL, // Filler later }; static esp_ble_adv_params_t adv_params = { .adv_int_min = 0x100, .adv_int_max = 0x100, .adv_type = ADV_TYPE_IND, .own_addr_type = BLE_ADDR_TYPE_PUBLIC, .channel_map = ADV_CHNL_ALL, .adv_filter_policy = ADV_FILTER_ALLOW_SCAN_ANY_CON_ANY, }; static char *protocomm_ble_device_name = NULL; static uint8_t *protocomm_ble_mfg_data = NULL; static size_t protocomm_ble_mfg_data_len; static uint8_t *protocomm_ble_addr = NULL; static void hexdump(const char *msg, uint8_t *buf, int len) { ESP_LOGD(TAG, "%s:", msg); ESP_LOG_BUFFER_HEX_LEVEL(TAG, buf, len, ESP_LOG_DEBUG); } static const uint16_t *uuid128_to_16(const uint8_t *uuid128) { return (const uint16_t *) &uuid128[12]; } static const char *handle_to_handler(uint16_t handle) { const uint8_t *uuid128 = simple_ble_get_uuid128(handle); if (!uuid128) { return NULL; } for (int i = 0; i < protoble_internal->g_nu_lookup_count; i++) { if (*uuid128_to_16(protoble_internal->g_nu_lookup[i].uuid128) == *uuid128_to_16(uuid128)) { return protoble_internal->g_nu_lookup[i].name; } } return NULL; } static void transport_simple_ble_read(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) { static const uint8_t *read_buf = NULL; static uint16_t read_len = 0; static uint16_t max_read_len = 0; esp_gatt_status_t status = ESP_OK; ESP_LOGD(TAG, "Inside read w/ session - %d on param %d %d", param->read.conn_id, param->read.handle, read_len); if (!read_len && !param->read.offset) { ESP_LOGD(TAG, "Reading attr value first time"); status = esp_ble_gatts_get_attr_value(param->read.handle, &read_len, &read_buf); max_read_len = read_len; } else if ((read_len + param->read.offset) > max_read_len) { status = ESP_GATT_INVALID_OFFSET; } else { ESP_LOGD(TAG, "Subsequent read request for attr value"); } esp_gatt_rsp_t gatt_rsp = {0}; gatt_rsp.attr_value.handle = param->read.handle; gatt_rsp.attr_value.offset = param->read.offset; if (status == ESP_GATT_OK) { gatt_rsp.attr_value.len = MIN(read_len, (protoble_internal->gatt_mtu - 1)); gatt_rsp.attr_value.auth_req = ESP_GATT_AUTH_REQ_NONE; if (gatt_rsp.attr_value.len && read_buf) { memcpy(gatt_rsp.attr_value.value, read_buf + param->read.offset, gatt_rsp.attr_value.len); } read_len -= gatt_rsp.attr_value.len; } else { read_len = 0; max_read_len = 0; read_buf = NULL; } esp_err_t err = esp_ble_gatts_send_response(gatts_if, param->read.conn_id, param->read.trans_id, status, &gatt_rsp); if (err != ESP_OK) { ESP_LOGE(TAG, "Send response error in read"); } } static esp_err_t prepare_write_event_env(esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) { ESP_LOGD(TAG, "prepare write, handle = %d, value len = %d, offset = %d", param->write.handle, param->write.len, param->write.offset); esp_gatt_status_t status = ESP_GATT_OK; /* Ensure that write data is not larger than max attribute length */ if (param->write.offset > PREPARE_BUF_MAX_SIZE) { status = ESP_GATT_INVALID_OFFSET; } else if ((param->write.offset + param->write.len) > PREPARE_BUF_MAX_SIZE) { status = ESP_GATT_INVALID_ATTR_LEN; } else { /* If prepare buffer is not allocated, then allocate it */ if (prepare_write_env.prepare_buf == NULL) { prepare_write_env.prepare_len = 0; prepare_write_env.prepare_buf = (uint8_t *) malloc(PREPARE_BUF_MAX_SIZE * sizeof(uint8_t)); if (prepare_write_env.prepare_buf == NULL) { ESP_LOGE(TAG, "%s , failed to allocate prepare buf", __func__); status = ESP_GATT_NO_RESOURCES; } } } /* If prepare buffer is allocated copy incoming data into it */ if (status == ESP_GATT_OK) { memcpy(prepare_write_env.prepare_buf + param->write.offset, param->write.value, param->write.len); prepare_write_env.prepare_len += param->write.len; prepare_write_env.handle = param->write.handle; } /* Send write response if needed */ if (param->write.need_rsp) { esp_err_t response_err; /* If data was successfully appended to prepare buffer * only then have it reflected in the response */ if (status == ESP_GATT_OK) { esp_gatt_rsp_t gatt_rsp = {0}; gatt_rsp.attr_value.len = param->write.len; gatt_rsp.attr_value.handle = param->write.handle; gatt_rsp.attr_value.offset = param->write.offset; gatt_rsp.attr_value.auth_req = ESP_GATT_AUTH_REQ_NONE; if (gatt_rsp.attr_value.len && param->write.value) { memcpy(gatt_rsp.attr_value.value, param->write.value, param->write.len); } response_err = esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, status, &gatt_rsp); } else { response_err = esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, status, NULL); } if (response_err != ESP_OK) { ESP_LOGE(TAG, "Send response error in prep write"); } } if (status != ESP_GATT_OK) { if (prepare_write_env.prepare_buf) { free(prepare_write_env.prepare_buf); prepare_write_env.prepare_buf = NULL; prepare_write_env.prepare_len = 0; } return ESP_FAIL; } return ESP_OK; } static void transport_simple_ble_write(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) { uint8_t *outbuf = NULL; ssize_t outlen = 0; esp_err_t ret; ESP_LOGD(TAG, "Inside write with session - %d on attr handle = %d \nlen = %d, is_prep = %d", param->write.conn_id, param->write.handle, param->write.len, param->write.is_prep); if (param->write.is_prep) { ret = prepare_write_event_env(gatts_if, param); if (ret != ESP_OK) { ESP_LOGE(TAG, "Error appending to prepare buffer"); } return; } else { ESP_LOGD(TAG, "is_prep not set"); } ret = protocomm_req_handle(protoble_internal->pc_ble, handle_to_handler(param->write.handle), param->write.conn_id, param->write.value, param->write.len, &outbuf, &outlen); if (ret == ESP_OK) { ret = esp_ble_gatts_set_attr_value(param->write.handle, outlen, outbuf); if (ret != ESP_OK) { ESP_LOGE(TAG, "Failed to set the session attribute value"); } ret = esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, ESP_GATT_OK, NULL); if (ret != ESP_OK) { ESP_LOGE(TAG, "Send response error in write"); } hexdump("Response from write", outbuf, outlen); } else { ESP_LOGE(TAG, "Invalid content received, killing connection"); esp_ble_gatts_close(gatts_if, param->write.conn_id); } if (outbuf) { free(outbuf); } } static void transport_simple_ble_exec_write(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) { esp_err_t err; uint8_t *outbuf = NULL; ssize_t outlen = 0; ESP_LOGD(TAG, "Inside exec_write w/ session - %d", param->exec_write.conn_id); if ((param->exec_write.exec_write_flag == ESP_GATT_PREP_WRITE_EXEC) && prepare_write_env.prepare_buf) { err = protocomm_req_handle(protoble_internal->pc_ble, handle_to_handler(prepare_write_env.handle), param->exec_write.conn_id, prepare_write_env.prepare_buf, prepare_write_env.prepare_len, &outbuf, &outlen); if (err != ESP_OK) { ESP_LOGE(TAG, "Invalid content received, killing connection"); esp_ble_gatts_close(gatts_if, param->exec_write.conn_id); } else { hexdump("Response from exec write", outbuf, outlen); esp_ble_gatts_set_attr_value(prepare_write_env.handle, outlen, outbuf); } } if (prepare_write_env.prepare_buf) { free(prepare_write_env.prepare_buf); prepare_write_env.prepare_buf = NULL; prepare_write_env.prepare_len = 0; } err = esp_ble_gatts_send_response(gatts_if, param->exec_write.conn_id, param->exec_write.trans_id, ESP_GATT_OK, NULL); if (err != ESP_OK) { ESP_LOGE(TAG, "Send response error in exec write"); } if (outbuf) { free(outbuf); } } static void transport_simple_ble_disconnect(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) { esp_err_t ret; ESP_LOGD(TAG, "Inside disconnect w/ session - %d", param->disconnect.conn_id); /* Ignore BLE events received after protocomm layer is stopped */ if (protoble_internal == NULL) { ESP_LOGI(TAG,"Protocomm layer has already stopped"); return; } if (protoble_internal->pc_ble->sec && protoble_internal->pc_ble->sec->close_transport_session) { ret = protoble_internal->pc_ble->sec->close_transport_session(protoble_internal->pc_ble->sec_inst, param->disconnect.conn_id); if (ret != ESP_OK) { ESP_LOGE(TAG, "error closing the session after disconnect"); } else { protocomm_ble_event_t ble_event = {}; /* Assign the event type */ ble_event.evt_type = PROTOCOMM_TRANSPORT_BLE_DISCONNECTED; /* Set the Disconnection handle */ ble_event.conn_handle = param->disconnect.conn_id; if (esp_event_post(PROTOCOMM_TRANSPORT_BLE_EVENT, PROTOCOMM_TRANSPORT_BLE_DISCONNECTED, &ble_event, sizeof(protocomm_ble_event_t), portMAX_DELAY) != ESP_OK) { ESP_LOGE(TAG, "Failed to post transport disconnection event"); } } } protoble_internal->gatt_mtu = ESP_GATT_DEF_BLE_MTU_SIZE; } static void transport_simple_ble_connect(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) { esp_err_t ret; ESP_LOGD(TAG, "Inside BLE connect w/ conn_id - %d", param->connect.conn_id); /* Ignore BLE events received after protocomm layer is stopped */ if (protoble_internal == NULL) { ESP_LOGI(TAG,"Protocomm layer has already stopped"); return; } if (protoble_internal->pc_ble->sec && protoble_internal->pc_ble->sec->new_transport_session) { ret = protoble_internal->pc_ble->sec->new_transport_session(protoble_internal->pc_ble->sec_inst, param->connect.conn_id); if (ret != ESP_OK) { ESP_LOGE(TAG, "error creating the session"); } else { protocomm_ble_event_t ble_event = {}; /* Assign the event type */ ble_event.evt_type = PROTOCOMM_TRANSPORT_BLE_CONNECTED; /* Set the Connection handle */ ble_event.conn_handle = param->connect.conn_id; if (esp_event_post(PROTOCOMM_TRANSPORT_BLE_EVENT, PROTOCOMM_TRANSPORT_BLE_CONNECTED, &ble_event, sizeof(protocomm_ble_event_t), portMAX_DELAY) != ESP_OK) { ESP_LOGE(TAG, "Failed to post transport pairing event"); } } } } static void transport_simple_ble_set_mtu(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) { protoble_internal->gatt_mtu = param->mtu.mtu; return; } static esp_err_t protocomm_ble_add_endpoint(const char *ep_name, protocomm_req_handler_t req_handler, void *priv_data) { /* Endpoint UUID already added when protocomm_ble_start() was called */ return ESP_OK; } static esp_err_t protocomm_ble_remove_endpoint(const char *ep_name) { /* Endpoint UUID will be removed when protocomm_ble_stop() is called */ return ESP_OK; } static ssize_t populate_gatt_db(esp_gatts_attr_db_t **gatt_db_generated) { int i; /* Each endpoint requires 3 attributes: * 1) for Characteristic Declaration * 2) for Characteristic Value (for reading and writing to an endpoint) * 3) for Characteristic User Description (endpoint name) * * Therefore, we need esp_gatts_attr_db_t of size 3 * number of endpoints + 1 for service */ ssize_t gatt_db_generated_entries = 3 * protoble_internal->g_nu_lookup_count + 1; *gatt_db_generated = (esp_gatts_attr_db_t *) malloc(sizeof(esp_gatts_attr_db_t) * (gatt_db_generated_entries)); if ((*gatt_db_generated) == NULL) { ESP_LOGE(TAG, "Failed to assign memory to gatt_db"); return -1; } /* Declare service */ (*gatt_db_generated)[0].attr_control.auto_rsp = ESP_GATT_RSP_BY_APP; (*gatt_db_generated)[0].att_desc.uuid_length = ESP_UUID_LEN_16; (*gatt_db_generated)[0].att_desc.uuid_p = (uint8_t *) &primary_service_uuid; (*gatt_db_generated)[0].att_desc.perm = ESP_GATT_PERM_READ; (*gatt_db_generated)[0].att_desc.max_length = ESP_UUID_LEN_128; (*gatt_db_generated)[0].att_desc.length = ESP_UUID_LEN_128; (*gatt_db_generated)[0].att_desc.value = protoble_internal->service_uuid; /* Declare characteristics */ for (i = 1 ; i < gatt_db_generated_entries ; i++) { (*gatt_db_generated)[i].attr_control.auto_rsp = ESP_GATT_RSP_BY_APP; if (i % 3 == 1) { /* Characteristic Declaration */ (*gatt_db_generated)[i].att_desc.perm = ESP_GATT_PERM_READ; (*gatt_db_generated)[i].att_desc.uuid_length = ESP_UUID_LEN_16; (*gatt_db_generated)[i].att_desc.uuid_p = (uint8_t *) &character_declaration_uuid; (*gatt_db_generated)[i].att_desc.max_length = sizeof(uint8_t); (*gatt_db_generated)[i].att_desc.length = sizeof(uint8_t); if (protoble_internal->ble_notify) { (*gatt_db_generated)[i].att_desc.value = (uint8_t *) &character_prop_read_write_notify; } else { (*gatt_db_generated)[i].att_desc.value = (uint8_t *) &character_prop_read_write; } } else if (i % 3 == 2) { /* Characteristic Value */ (*gatt_db_generated)[i].att_desc.perm = ESP_GATT_PERM_READ | ESP_GATT_PERM_WRITE ; if (protoble_internal->ble_link_encryption) { (*gatt_db_generated)[i].att_desc.perm |= ESP_GATT_PERM_READ_ENCRYPTED | ESP_GATT_PERM_WRITE_ENCRYPTED; } (*gatt_db_generated)[i].att_desc.uuid_length = ESP_UUID_LEN_128; (*gatt_db_generated)[i].att_desc.uuid_p = protoble_internal->g_nu_lookup[i / 3].uuid128; (*gatt_db_generated)[i].att_desc.max_length = CHAR_VAL_LEN_MAX; (*gatt_db_generated)[i].att_desc.length = 0; (*gatt_db_generated)[i].att_desc.value = NULL; } else { /* Characteristic User Description (for keeping endpoint names) */ (*gatt_db_generated)[i].att_desc.perm = ESP_GATT_PERM_READ; (*gatt_db_generated)[i].att_desc.uuid_length = ESP_UUID_LEN_16; (*gatt_db_generated)[i].att_desc.uuid_p = (uint8_t *) &character_user_description; (*gatt_db_generated)[i].att_desc.max_length = strlen(protoble_internal->g_nu_lookup[i / 3 - 1].name); (*gatt_db_generated)[i].att_desc.length = (*gatt_db_generated)[i].att_desc.max_length; (*gatt_db_generated)[i].att_desc.value = (uint8_t *) protoble_internal->g_nu_lookup[i / 3 - 1].name; } } return gatt_db_generated_entries; } static void protocomm_ble_cleanup(void) { if (protoble_internal) { if (protoble_internal->g_nu_lookup) { for (unsigned i = 0; i < protoble_internal->g_nu_lookup_count; i++) { if (protoble_internal->g_nu_lookup[i].name) { free((void *)protoble_internal->g_nu_lookup[i].name); } } free(protoble_internal->g_nu_lookup); } free(protoble_internal); protoble_internal = NULL; } if (protocomm_ble_device_name) { free(protocomm_ble_device_name); protocomm_ble_device_name = NULL; } if (protocomm_ble_mfg_data) { free(protocomm_ble_mfg_data); protocomm_ble_mfg_data = NULL; protocomm_ble_mfg_data_len = 0; } } esp_err_t protocomm_ble_start(protocomm_t *pc, const protocomm_ble_config_t *config) { if (!pc || !config || !config->nu_lookup) { return ESP_ERR_INVALID_ARG; } if (protoble_internal) { ESP_LOGE(TAG, "Protocomm BLE already started"); return ESP_FAIL; } /* Store BLE device name internally */ protocomm_ble_device_name = strdup(config->device_name); if (protocomm_ble_device_name == NULL) { ESP_LOGE(TAG, "Error allocating memory for storing BLE device name"); protocomm_ble_cleanup(); return ESP_ERR_NO_MEM; } /* Store BLE manufacturer data pointer */ if (config->manufacturer_data != NULL) { protocomm_ble_mfg_data = config->manufacturer_data; protocomm_ble_mfg_data_len = config->manufacturer_data_len; } if (config->ble_addr != NULL) { protocomm_ble_addr = config->ble_addr; } protoble_internal = (_protocomm_ble_internal_t *) calloc(1, sizeof(_protocomm_ble_internal_t)); if (protoble_internal == NULL) { ESP_LOGE(TAG, "Error allocating internal protocomm structure"); protocomm_ble_cleanup(); return ESP_ERR_NO_MEM; } protoble_internal->g_nu_lookup_count = config->nu_lookup_count; protoble_internal->g_nu_lookup = malloc(config->nu_lookup_count * sizeof(name_uuid128_t)); if (protoble_internal->g_nu_lookup == NULL) { ESP_LOGE(TAG, "Error allocating internal name UUID table"); protocomm_ble_cleanup(); return ESP_ERR_NO_MEM; } for (unsigned i = 0; i < protoble_internal->g_nu_lookup_count; i++) { memcpy(protoble_internal->g_nu_lookup[i].uuid128, config->service_uuid, ESP_UUID_LEN_128); memcpy((uint8_t *)uuid128_to_16(protoble_internal->g_nu_lookup[i].uuid128), &config->nu_lookup[i].uuid, ESP_UUID_LEN_16); protoble_internal->g_nu_lookup[i].name = strdup(config->nu_lookup[i].name); if (protoble_internal->g_nu_lookup[i].name == NULL) { ESP_LOGE(TAG, "Error allocating internal name UUID entry"); protocomm_ble_cleanup(); return ESP_ERR_NO_MEM; } } pc->add_endpoint = protocomm_ble_add_endpoint; pc->remove_endpoint = protocomm_ble_remove_endpoint; protoble_internal->pc_ble = pc; protoble_internal->gatt_mtu = ESP_GATT_DEF_BLE_MTU_SIZE; protoble_internal->ble_link_encryption = config->ble_link_encryption; protoble_internal->ble_notify = config->ble_notify; // Config adv data adv_config.service_uuid_len = ESP_UUID_LEN_128; adv_config.p_service_uuid = (uint8_t *) config->service_uuid; protoble_internal->service_uuid = (uint8_t *) config->service_uuid; // Config scan response data scan_rsp_config.manufacturer_len = protocomm_ble_mfg_data_len; scan_rsp_config.p_manufacturer_data = (uint8_t *) protocomm_ble_mfg_data; simple_ble_cfg_t *ble_config = simple_ble_init(); if (ble_config == NULL) { ESP_LOGE(TAG, "Ran out of memory for BLE config"); protocomm_ble_cleanup(); return ESP_ERR_NO_MEM; } /* Set function pointers required for simple BLE layer */ ble_config->read_fn = transport_simple_ble_read; ble_config->write_fn = transport_simple_ble_write; ble_config->exec_write_fn = transport_simple_ble_exec_write; ble_config->disconnect_fn = transport_simple_ble_disconnect; ble_config->connect_fn = transport_simple_ble_connect; ble_config->set_mtu_fn = transport_simple_ble_set_mtu; /* Set parameters required for advertising */ ble_config->adv_params = adv_params; ble_config->adv_data_p = &adv_config; ble_config->scan_rsp_data_p = &scan_rsp_config; ble_config->device_name = protocomm_ble_device_name; ble_config->gatt_db_count = populate_gatt_db(&ble_config->gatt_db); ble_config->ble_bonding = config->ble_bonding; ble_config->ble_sm_sc = config->ble_sm_sc; /* Set parameter to keep BLE on */ ble_config->keep_ble_on = config->keep_ble_on; if (config->ble_addr != NULL) { ble_config->ble_addr = protocomm_ble_addr; } if (ble_config->gatt_db_count == -1) { ESP_LOGE(TAG, "Invalid GATT database count"); simple_ble_deinit(); protocomm_ble_cleanup(); return ESP_ERR_INVALID_STATE; } esp_err_t err = simple_ble_start(ble_config); if (err != ESP_OK) { ESP_LOGE(TAG, "simple_ble_start failed w/ error code 0x%x", err); simple_ble_deinit(); protocomm_ble_cleanup(); return err; } prepare_write_env.prepare_buf = NULL; ESP_LOGD(TAG, "Waiting for client to connect ......"); return ESP_OK; } esp_err_t protocomm_ble_stop(protocomm_t *pc) { if ((pc != NULL) && (protoble_internal != NULL ) && (pc == protoble_internal->pc_ble)) { esp_err_t ret = ESP_OK; uint8_t protocomm_keep_ble_on = get_keep_ble_on(); if (protocomm_keep_ble_on) { #ifdef CONFIG_ESP_PROTOCOMM_DISCONNECT_AFTER_BLE_STOP /* Keep BT stack on, but terminate the connection after provisioning */ ret = simple_ble_disconnect(); if (ret) { ESP_LOGE(TAG, "BLE disconnect failed"); } simple_ble_deinit(); #endif // CONFIG_ESP_PROTOCOMM_DISCONNECT_AFTER_BLE_STOP } else { /* If flag is not enabled, stop the stack. */ ret = simple_ble_stop(); if (ret) { ESP_LOGE(TAG, "BLE stop failed"); } simple_ble_deinit(); } protocomm_ble_cleanup(); return ret; } return ESP_ERR_INVALID_ARG; }