pinebuds/services/ble_profiles/blp/blpc/src/blpc_task.c

/**
 ****************************************************************************************
 * @addtogroup BLPCTASK
 * @{
 ****************************************************************************************
 */

/*
 * INCLUDE FILES
 ****************************************************************************************
 */

#include "rwip_config.h"

#if (BLE_BP_COLLECTOR)
#include "att.h"
#include "blpc.h"
#include "blpc_task.h"
#include "co_utils.h"
#include "gap.h"
#include "gapc_task.h"
#include "gattc_task.h"
#include "ke_mem.h"

/*
 * DEFINES
 ****************************************************************************************
 */

/// State machine used to retrieve blood pressure service characteristics
/// information
const struct prf_char_def blpc_bps_char[BLPC_CHAR_MAX] = {
    /// Blood Pressure Measurement
    [BLPC_CHAR_BP_MEAS] = {ATT_CHAR_BLOOD_PRESSURE_MEAS, ATT_MANDATORY,
                           ATT_CHAR_PROP_IND},
    /// Intermediate Cuff pressure
    [BLPC_CHAR_CP_MEAS] = {ATT_CHAR_INTERMEDIATE_CUFF_PRESSURE, ATT_OPTIONAL,
                           ATT_CHAR_PROP_NTF},
    /// Blood Pressure Feature
    [BLPC_CHAR_BP_FEATURE] = {ATT_CHAR_BLOOD_PRESSURE_FEATURE, ATT_MANDATORY,
                              ATT_CHAR_PROP_RD},
};

/// State machine used to retrieve blood pressure service characteristic
/// description information
const struct prf_char_desc_def blpc_bps_char_desc[BLPC_DESC_MAX] = {
    /// Blood Pressure Measurement client config
    [BLPC_DESC_BP_MEAS_CLI_CFG] = {ATT_DESC_CLIENT_CHAR_CFG, ATT_MANDATORY,
                                   BLPC_CHAR_BP_MEAS},
    /// Intermediate Cuff pressure client config
    [BLPC_DESC_IC_MEAS_CLI_CFG] = {ATT_DESC_CLIENT_CHAR_CFG, ATT_MANDATORY,
                                   BLPC_CHAR_CP_MEAS},
};

/*
 * LOCAL FUNCTIONS DEFINITIONS
 ****************************************************************************************
 */

/**
 ****************************************************************************************
 * @brief Handles reception of the @ref GATTC_SDP_SVC_IND_HANDLER message.
 * The handler stores the found service details for service discovery.
 * @param[in] msgid Id of the message received (probably unused).
 * @param[in] param Pointer to the parameters of the message.
 * @param[in] dest_id ID of the receiving task instance (probably unused).
 * @param[in] src_id ID of the sending task instance.
 * @return If the message was consumed or not.
 ****************************************************************************************
 */
__STATIC int gattc_sdp_svc_ind_handler(ke_msg_id_t const msgid,
                                       struct gattc_sdp_svc_ind const *ind,
                                       ke_task_id_t const dest_id,
                                       ke_task_id_t const src_id) {
  uint8_t state = ke_state_get(dest_id);

  if (state == BLPC_DISCOVERING) {
    uint8_t conidx = KE_IDX_GET(dest_id);

    struct blpc_env_tag *blpc_env = PRF_ENV_GET(BLPC, blpc);

    ASSERT_INFO(blpc_env != NULL, dest_id, src_id);
    ASSERT_INFO(blpc_env->env[conidx] != NULL, dest_id, src_id);

    if (blpc_env->env[conidx]->nb_svc == 0) {
      // Retrieve BLS characteristics and descriptors
      prf_extract_svc_info(ind, BLPC_CHAR_MAX, &blpc_bps_char[0],
                           &blpc_env->env[conidx]->bps.chars[0], BLPC_DESC_MAX,
                           &blpc_bps_char_desc[0],
                           &blpc_env->env[conidx]->bps.descs[0]);

      // Even if we get multiple responses we only store 1 range
      blpc_env->env[conidx]->bps.svc.shdl = ind->start_hdl;
      blpc_env->env[conidx]->bps.svc.ehdl = ind->end_hdl;
    }

    blpc_env->env[conidx]->nb_svc++;
  }

  return (KE_MSG_CONSUMED);
}

/**
 ****************************************************************************************
 * @brief Handles reception of the @ref BLPC_ENABLE_REQ message.
 * The handler enables the Blood Pressure Profile Collector Role.
 * @param[in] msgid Id of the message received (probably unused).
 * @param[in] param Pointer to the parameters of the message.
 * @param[in] dest_id ID of the receiving task instance (probably unused).
 * @param[in] src_id ID of the sending task instance.
 * @return If the message was consumed or not.
 ****************************************************************************************
 */
__STATIC int blpc_enable_req_handler(ke_msg_id_t const msgid,
                                     struct blpc_enable_req const *param,
                                     ke_task_id_t const dest_id,
                                     ke_task_id_t const src_id) {
  // Status
  uint8_t status = GAP_ERR_NO_ERROR;
  // Get connection index
  uint8_t conidx = KE_IDX_GET(dest_id);
  // Get state
  uint8_t state = ke_state_get(dest_id);

  // Blood pressure Client Role Task Environment
  struct blpc_env_tag *blpc_env = PRF_ENV_GET(BLPC, blpc);

  ASSERT_INFO(blpc_env != NULL, dest_id, src_id);
  if ((state == BLPC_IDLE) && (blpc_env->env[conidx] == NULL)) {
    // allocate environment variable for task instance
    blpc_env->env[conidx] = (struct blpc_cnx_env *)ke_malloc(
        sizeof(struct blpc_cnx_env), KE_MEM_ATT_DB);
    memset(blpc_env->env[conidx], 0, sizeof(struct blpc_cnx_env));

    // Config connection, start discovering
    if (param->con_type == PRF_CON_DISCOVERY) {
      // start discovering BPS on peer
      prf_disc_svc_send(&(blpc_env->prf_env), conidx, ATT_SVC_BLOOD_PRESSURE);

      blpc_env->env[conidx]->last_uuid_req = ATT_SVC_BLOOD_PRESSURE;

      // Go to DISCOVERING state
      ke_state_set(dest_id, BLPC_DISCOVERING);
    }
    // normal connection, get saved att details
    else {
      blpc_env->env[conidx]->bps = param->bps;

      // send APP confirmation that can start normal connection to TH
      blpc_enable_rsp_send(blpc_env, conidx, GAP_ERR_NO_ERROR);
    }
  }

  else if (state != BLPC_FREE) {
    status = PRF_ERR_REQ_DISALLOWED;
  }

  // send an error if request fails
  if (status != GAP_ERR_NO_ERROR) {
    blpc_enable_rsp_send(blpc_env, conidx, status);
  }

  return (KE_MSG_CONSUMED);
}

/**
 ****************************************************************************************
 * @brief Handles reception of the @ref GATTC_CMP_EVT message.
 * This generic event is received for different requests, so need to keep track.
 * @param[in] msgid Id of the message received (probably unused).
 * @param[in] param Pointer to the parameters of the message.
 * @param[in] dest_id ID of the receiving task instance (probably unused).
 * @param[in] src_id ID of the sending task instance.
 * @return If the message was consumed or not.
 ****************************************************************************************
 */
__STATIC int gattc_cmp_evt_handler(ke_msg_id_t const msgid,
                                   struct gattc_cmp_evt const *param,
                                   ke_task_id_t const dest_id,
                                   ke_task_id_t const src_id) {

  // Get the address of the environment
  struct blpc_env_tag *blpc_env = PRF_ENV_GET(BLPC, blpc);
  // Status
  uint8_t status;

  if (blpc_env != NULL) {
    uint8_t conidx = KE_IDX_GET(dest_id);
    uint8_t state = ke_state_get(dest_id);

    if (state == BLPC_DISCOVERING) {
      status = param->status;

      if ((status == ATT_ERR_ATTRIBUTE_NOT_FOUND) ||
          (status == ATT_ERR_NO_ERROR)) {
        // Discovery
        // check characteristic validity
        if (blpc_env->env[conidx]->nb_svc == 1) {
          status = prf_check_svc_char_validity(
              BLPC_CHAR_MAX, blpc_env->env[conidx]->bps.chars, blpc_bps_char);
        }
        // too much services
        else if (blpc_env->env[conidx]->nb_svc > 1) {
          status = PRF_ERR_MULTIPLE_SVC;
        }
        // no services found
        else {
          status = PRF_ERR_STOP_DISC_CHAR_MISSING;
        }

        // check descriptor validity
        if (status == GAP_ERR_NO_ERROR) {
          status = prf_check_svc_char_desc_validity(
              BLPC_DESC_MAX, blpc_env->env[conidx]->bps.descs,
              blpc_bps_char_desc, blpc_env->env[conidx]->bps.chars);
        }
      }

      blpc_enable_rsp_send(blpc_env, conidx, status);
    }

    else if (BLPC_BUSY) {
      switch (param->operation) {

      case GATTC_WRITE:
      case GATTC_WRITE_NO_RESPONSE: {
        struct blpc_cfg_indntf_rsp *wr_cfm = KE_MSG_ALLOC(
            BLPC_CFG_INDNTF_RSP, prf_dst_task_get(&(blpc_env->prf_env), conidx),
            prf_src_task_get(&(blpc_env->prf_env), conidx),
            blpc_cfg_indntf_rsp);
        // it will be a GATT status code
        wr_cfm->status = param->status;
        // send the message
        ke_msg_send(wr_cfm);
      } break;

      case GATTC_READ: {
        if (param->status != GAP_ERR_NO_ERROR) {
          prf_client_att_info_rsp((prf_env_t *)blpc_env->env[conidx], conidx,
                                  BLPC_RD_CHAR_RSP, param->status, NULL);
        }
      } break;

      default:
        break;
      }

      ke_state_set(prf_src_task_get(&blpc_env->prf_env, conidx), BLPC_IDLE);
    }
  }
  return (KE_MSG_CONSUMED);
}

/**
 ****************************************************************************************
 * @brief Handles reception of the @ref BLPC_RD_CHAR_REQ message.
 * Check if the handle exists in profile(already discovered) and send request,
 *otherwise error to APP.
 * @param[in] msgid Id of the message received (probably unused).
 * @param[in] param Pointer to the parameters of the message.
 * @param[in] dest_id ID of the receiving task instance (probably unused).
 * @param[in] src_id ID of the sending task instance.
 * @return If the message was consumed or not.
 ****************************************************************************************
 */
__STATIC int blpc_rd_char_req_handler(ke_msg_id_t const msgid,
                                      struct blpc_rd_char_req const *param,
                                      ke_task_id_t const dest_id,
                                      ke_task_id_t const src_id) {
  uint8_t state = ke_state_get(dest_id);
  uint8_t status = PRF_ERR_REQ_DISALLOWED;

  // Get the address of the environment
  struct blpc_env_tag *blpc_env = PRF_ENV_GET(BLPC, blpc);
  // Get connection index
  uint8_t conidx = KE_IDX_GET(dest_id);

  if ((state == BLPC_IDLE) && (blpc_env->env[conidx] != NULL)) {
    uint16_t search_hdl = ATT_INVALID_SEARCH_HANDLE;

    if ((param->char_code & BLPC_DESC_MASK) == BLPC_DESC_MASK) {
      search_hdl = blpc_env->env[conidx]
                       ->bps.descs[param->char_code & ~BLPC_DESC_MASK]
                       .desc_hdl;
    } else {
      search_hdl = blpc_env->env[conidx]->bps.chars[param->char_code].val_hdl;
    }

    // check if handle is viable
    if (search_hdl != ATT_INVALID_SEARCH_HANDLE) {
      prf_read_char_send(&(blpc_env->prf_env), conidx,
                         blpc_env->env[conidx]->bps.svc.shdl,
                         blpc_env->env[conidx]->bps.svc.ehdl, search_hdl);

      status = GAP_ERR_NO_ERROR;
    } else {
      status = PRF_ERR_INEXISTENT_HDL;
    }
  }

  if (status != GAP_ERR_NO_ERROR) {
    prf_client_att_info_rsp((prf_env_t *)blpc_env->env[conidx], conidx,
                            BLPC_RD_CHAR_RSP, status, NULL);
  }

  return (KE_MSG_CONSUMED);
}

/**
 ****************************************************************************************
 * @brief Handles reception of the @ref GATTC_READ_IND message.
 * Generic event received after every simple read command sent to peer server.
 * @param[in] msgid Id of the message received (probably unused).
 * @param[in] param Pointer to the parameters of the message.
 * @param[in] dest_id ID of the receiving task instance (probably unused).
 * @param[in] src_id ID of the sending task instance.
 * @return If the message was consumed or not.
 ****************************************************************************************
 */
__STATIC int gattc_read_ind_handler(ke_msg_id_t const msgid,
                                    struct gattc_read_ind const *param,
                                    ke_task_id_t const dest_id,
                                    ke_task_id_t const src_id) {
  // Get the address of the environment
  struct blpc_env_tag *blpc_env = PRF_ENV_GET(BLPC, blpc);
  // Get connection index
  uint8_t conidx = KE_IDX_GET(dest_id);

  prf_client_att_info_rsp(&blpc_env->prf_env, conidx, BLPC_RD_CHAR_RSP,
                          GAP_ERR_NO_ERROR, param);

  return (KE_MSG_CONSUMED);
}

/**
 ****************************************************************************************
 * @brief Handles reception of the @ref BLPC_CFG_INDNTF_REQ message.
 * It allows configuration of the peer ind/ntf/stop characteristic for a
 *specified characteristic. Will return an error code if that cfg char does not
 *exist.
 * @param[in] msgid Id of the message received (probably unused).
 * @param[in] param Pointer to the parameters of the message.
 * @param[in] dest_id ID of the receiving task instance (probably unused).
 * @param[in] src_id ID of the sending task instance.
 * @return If the message was consumed or not.
 ****************************************************************************************
 */
__STATIC int blpc_cfg_indntf_req_handler(
    ke_msg_id_t const msgid, struct blpc_cfg_indntf_req const *param,
    ke_task_id_t const dest_id, ke_task_id_t const src_id) {
  uint16_t cfg_hdl = ATT_INVALID_SEARCH_HANDLE;
  // Get the address of the environment
  struct blpc_env_tag *blpc_env = PRF_ENV_GET(BLPC, blpc);
  // Get connection index
  uint8_t conidx = KE_IDX_GET(dest_id);
  // Status
  uint8_t status = PRF_ERR_REQ_DISALLOWED;

  if ((blpc_env->env[conidx] != NULL) && (ke_state_get(dest_id) == BLPC_IDLE)) {
    status = PRF_ERR_INVALID_PARAM;
    // get handle of the configuration characteristic to set and check if value
    // matches property
    switch (param->char_code) {
    case BLPC_CHAR_BP_MEAS: // can only IND
    {
      if ((param->cfg_val == PRF_CLI_STOP_NTFIND) ||
          (param->cfg_val == PRF_CLI_START_IND)) {
        cfg_hdl = blpc_env->env[conidx]
                      ->bps.descs[BLPC_DESC_BP_MEAS_CLI_CFG]
                      .desc_hdl;
      }
    } break;

    case BLPC_CHAR_CP_MEAS: // can only NTF
    {
      if ((param->cfg_val == PRF_CLI_STOP_NTFIND) ||
          (param->cfg_val == PRF_CLI_START_NTF)) {
        cfg_hdl = blpc_env->env[conidx]
                      ->bps.descs[BLPC_DESC_IC_MEAS_CLI_CFG]
                      .desc_hdl;
      }

    } break;

    default: {
      status = PRF_ERR_INEXISTENT_HDL;
    } break;
    }

    // check if the handle value exists
    if (cfg_hdl != ATT_INVALID_SEARCH_HANDLE) {
      // Send GATT Write Request
      prf_gatt_write_ntf_ind(&blpc_env->prf_env, conidx, cfg_hdl,
                             param->cfg_val);
      // Set status
      status = GAP_ERR_NO_ERROR;
    }
  }

  if (status != GAP_ERR_NO_ERROR) {
    struct blpc_cfg_indntf_rsp *rsp =
        KE_MSG_ALLOC(BLPC_CFG_INDNTF_RSP, src_id, dest_id, blpc_cfg_indntf_rsp);

    // It will be an PRF status code
    rsp->status = status;

    // Send the message
    ke_msg_send(rsp);
  }

  return (KE_MSG_CONSUMED);
}

/**
 ****************************************************************************************
 * @brief Handles reception of the @ref GATTC_EVENT_IND message.
 * @param[in] msgid Id of the message received (probably unused).
 * @param[in] param Pointer to the parameters of the message.
 * @param[in] dest_id ID of the receiving task instance (probably unused).
 * @param[in] src_id ID of the sending task instance.
 * @return If the message was consumed or not.
 ****************************************************************************************
 */
__STATIC int gattc_event_ind_handler(ke_msg_id_t const msgid,
                                     struct gattc_event_ind const *param,
                                     ke_task_id_t const dest_id,
                                     ke_task_id_t const src_id) {
  uint8_t conidx = KE_IDX_GET(dest_id);
  // Get the address of the environment
  struct blpc_env_tag *blpc_env = PRF_ENV_GET(BLPC, blpc);

  if (blpc_env->env[conidx] != NULL) {
    switch (param->type) {
    case GATTC_INDICATE: {
      // confirm that indication has been correctly received
      struct gattc_event_cfm *cfm =
          KE_MSG_ALLOC(GATTC_EVENT_CFM, src_id, dest_id, gattc_event_cfm);
      cfm->handle = param->handle;
      ke_msg_send(cfm);
    }
      /* no break */

    case GATTC_NOTIFY: {
      if ((param->handle ==
           blpc_env->env[conidx]->bps.chars[BLPC_CHAR_CP_MEAS].val_hdl) ||
          ((param->handle ==
            blpc_env->env[conidx]->bps.chars[BLPC_CHAR_BP_MEAS].val_hdl))) {
        // build a BLPC_BP_MEAD_IND message with stable blood pressure value
        // code.
        struct blpc_bp_meas_ind *ind = KE_MSG_ALLOC(
            BLPC_BP_MEAS_IND, prf_dst_task_get(&(blpc_env->prf_env), conidx),
            prf_src_task_get(&(blpc_env->prf_env), conidx), blpc_bp_meas_ind);

        // Intermediate cuff pressure value
        ind->flag_interm_cp = ((param->type == GATTC_NOTIFY) ? 0x01 : 0x00);

        // unpack blood pressure measurement.
        blpc_unpack_meas_value(&(ind->meas_val), (uint8_t *)param->value);

        ke_msg_send(ind);
      }
    } break;

    default:
      break;
    }
  }
  return (KE_MSG_CONSUMED);
}

/*
 * GLOBAL VARIABLE DEFINITIONS
 ****************************************************************************************
 */

/// Default State handlers definition
KE_MSG_HANDLER_TAB(blpc){
    {GATTC_SDP_SVC_IND, (ke_msg_func_t)gattc_sdp_svc_ind_handler},
    {BLPC_ENABLE_REQ, (ke_msg_func_t)blpc_enable_req_handler},
    {GATTC_CMP_EVT, (ke_msg_func_t)gattc_cmp_evt_handler},
    {BLPC_RD_CHAR_REQ, (ke_msg_func_t)blpc_rd_char_req_handler},
    {GATTC_READ_IND, (ke_msg_func_t)gattc_read_ind_handler},
    {GATTC_EVENT_IND, (ke_msg_func_t)gattc_event_ind_handler},
    {GATTC_EVENT_REQ_IND, (ke_msg_func_t)gattc_event_ind_handler},
    {BLPC_CFG_INDNTF_REQ, (ke_msg_func_t)blpc_cfg_indntf_req_handler},
};

void blpc_task_init(struct ke_task_desc *task_desc) {
  // Get the address of the environment
  struct blpc_env_tag *blpc_env = PRF_ENV_GET(BLPC, blpc);

  task_desc->msg_handler_tab = blpc_msg_handler_tab;
  task_desc->msg_cnt = ARRAY_LEN(blpc_msg_handler_tab);
  task_desc->state = blpc_env->state;
  task_desc->idx_max = BLPC_IDX_MAX;
}

#endif /* (BLE_BP_COLLECTOR) */
/// @} BLPCTASK