src/platform/silabs/wifi/WifiInterfaceAbstraction.cpp

/*
 *
 *    Copyright (c) 2022 Project CHIP Authors
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

// SL MATTER WI-FI INTERFACE

#include "silabs_utils.h"
#include <app/icd/server/ICDServerConfig.h>
#include <lib/support/CHIPMem.h>
#include <lib/support/CodeUtils.h>
#include <lib/support/logging/CHIPLogging.h>
#include <platform/silabs/wifi/WifiInterfaceAbstraction.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

using namespace chip;
using namespace chip::DeviceLayer;

#define CONVERT_SEC_TO_MS(TimeInS) (TimeInS * 1000)

// TODO: This is a workaround because we depend on the platform lib which depends on the platform implementation.
//       As such we can't depend on the platform here as well
extern void HandleWFXSystemEvent(wfx_event_base_t eventBase, sl_wfx_generic_message_t * eventData);

namespace {

constexpr uint8_t kWlanMinRetryIntervalsInSec = 1;
constexpr uint8_t kWlanMaxRetryIntervalsInSec = 60;
constexpr uint8_t kWlanRetryIntervalInSec     = 5;
uint8_t retryInterval                         = kWlanMinRetryIntervalsInSec;
osTimerId_t sRetryTimer;

/*
 * Notifications to the upper-layer
 * All done in the context of the RSI/WiFi task (rsi_if.c)
 */
void RetryConnectionTimerHandler(void * arg)
{
#if CHIP_CONFIG_ENABLE_ICD_SERVER && SLI_SI91X_MCU_INTERFACE
    wfx_rsi_power_save(RSI_ACTIVE, HIGH_PERFORMANCE);
#endif // CHIP_CONFIG_ENABLE_ICD_SERVER && SLI_SI91X_MCU_INTERFACE
    if (wfx_connect_to_ap() != SL_STATUS_OK)
    {
        ChipLogError(DeviceLayer, "wfx_connect_to_ap() failed.");
    }
}

} // namespace

/***********************************************************************************
 * @fn  sl_matter_wifi_task_started(void)
 * @brief
 *       Wifi device started notification
 * @param[in]: None
 * @return None
 *************************************************************************************/
void sl_matter_wifi_task_started(void)
{
    sl_wfx_startup_ind_t evt;
    sl_wfx_mac_address_t mac;

    // Creating a timer which will be used to retry connection with AP
    sRetryTimer = osTimerNew(RetryConnectionTimerHandler, osTimerOnce, NULL, NULL);
    VerifyOrReturn(sRetryTimer != NULL);

    memset(&evt, 0, sizeof(evt));
    evt.header.id     = SL_WFX_STARTUP_IND_ID;
    evt.header.length = sizeof evt;
    evt.body.status   = 0;
    wfx_get_wifi_mac_addr(SL_WFX_STA_INTERFACE, &mac);
    memcpy(&evt.body.mac_addr[0], &mac.octet[0], MAC_ADDRESS_FIRST_OCTET);

    HandleWFXSystemEvent(WIFI_EVENT, (sl_wfx_generic_message_t *) &evt);
}

/***********************************************************************************
 * @fn  void wfx_connected_notify(int32_t status, sl_wfx_mac_address_t *ap)
 * @brief
 * For now we are not notifying anything other than AP Mac -
 * Other stuff such as DTIM etc. may be required for later
 * @param[in] status:
 * @param[in] ap: access point
 * @return None
 *************************************************************************************/
void wfx_connected_notify(int32_t status, sl_wfx_mac_address_t * ap)
{
    sl_wfx_connect_ind_t evt;

    VerifyOrReturn(status == SUCCESS_STATUS);

    memset(&evt, 0, sizeof(evt));
    evt.header.id     = SL_WFX_CONNECT_IND_ID;
    evt.header.length = sizeof evt;

#ifdef RS911X_WIFI
    evt.body.channel = wfx_rsi.ap_chan;
#endif
    memcpy(&evt.body.mac[0], &ap->octet[0], MAC_ADDRESS_FIRST_OCTET);

    HandleWFXSystemEvent(WIFI_EVENT, (sl_wfx_generic_message_t *) &evt);
}

/**************************************************************************************
 * @fn  void wfx_disconnected_notify(int32_t status)
 * @brief
 *    notification of disconnection
 * @param[in] status:
 * @return None
 *************************************************************************************/
void wfx_disconnected_notify(int32_t status)
{
    sl_wfx_disconnect_ind_t evt;

    memset(&evt, 0, sizeof(evt));
    evt.header.id     = SL_WFX_DISCONNECT_IND_ID;
    evt.header.length = sizeof evt;
    evt.body.reason   = status;
    HandleWFXSystemEvent(WIFI_EVENT, (sl_wfx_generic_message_t *) &evt);
}

/**************************************************************************************
 * @fn  void wfx_ipv6_notify(int got_ip)
 * @brief
 *      notification of ipv6
 * @param[in]  got_ip:
 * @return None
 *************************************************************************************/
void wfx_ipv6_notify(int got_ip)
{
    sl_wfx_generic_message_t eventData;

    memset(&eventData, 0, sizeof(eventData));
    eventData.header.id     = got_ip ? IP_EVENT_GOT_IP6 : IP_EVENT_STA_LOST_IP;
    eventData.header.length = sizeof(eventData.header);
    HandleWFXSystemEvent(IP_EVENT, &eventData);
}

/**************************************************************************************
 * @fn   void wfx_ip_changed_notify(int got_ip)
 * @brief
 *      notification of ip change
 * @param[in]  got_ip:
 * @return None
 *************************************************************************************/
void wfx_ip_changed_notify(int got_ip)
{
    sl_wfx_generic_message_t eventData;

    memset(&eventData, 0, sizeof(eventData));
    eventData.header.id     = got_ip ? IP_EVENT_STA_GOT_IP : IP_EVENT_STA_LOST_IP;
    eventData.header.length = sizeof(eventData.header);
    HandleWFXSystemEvent(IP_EVENT, &eventData);
}

/**************************************************************************************
 * @fn  void wfx_retry_connection(uint16_t retryAttempt)
 * @brief
 *      During commissioning, we retry to join the network MAX_JOIN_RETRIES_COUNT times.
 *      If DUT is disconnected from the AP or device is power cycled, then retry connection
 *      with AP continously after a certain time interval.
 * @param[in]  retryAttempt
 * @return None
 *************************************************************************************/
void wfx_retry_connection(uint16_t retryAttempt)
{
    // During commissioning, we retry to join the network MAX_JOIN_RETRIES_COUNT
    if (/*BaseApplication::sAppDelegate.isCommissioningInProgress()*/ true)
    {
        if (retryAttempt < MAX_JOIN_RETRIES_COUNT)
        {
            ChipLogProgress(DeviceLayer, "wfx_retry_connection : Next attempt after %d Seconds", kWlanRetryIntervalInSec);
            if (osTimerStart(sRetryTimer, pdMS_TO_TICKS(CONVERT_SEC_TO_MS(kWlanRetryIntervalInSec))) != osOK)
            {
                ChipLogProgress(DeviceLayer, "Failed to start retry timer");
                // Sending the join command if retry timer failed to start
                if (wfx_connect_to_ap() != SL_STATUS_OK)
                {
                    ChipLogError(DeviceLayer, "wfx_connect_to_ap() failed.");
                }
                return;
            }
        }
        else
        {
            ChipLogProgress(DeviceLayer, "Connect failed after max %d tries", retryAttempt);
        }
    }
    else
    {
        /* After disconnection or power cycle the DUT
         * At the telescopic time interval device try to reconnect with AP, upto WLAN_MAX_RETRY_TIMER_MS intervals
         * are telescopic. If interval exceed WLAN_MAX_RETRY_TIMER_MS then it will try to reconnect at
         * WLAN_MAX_RETRY_TIMER_MS intervals.
         */
        if (retryInterval > kWlanMaxRetryIntervalsInSec)
        {
            retryInterval = kWlanMaxRetryIntervalsInSec;
        }
        if (osTimerStart(sRetryTimer, pdMS_TO_TICKS(CONVERT_SEC_TO_MS(retryInterval))) != osOK)
        {
            ChipLogProgress(DeviceLayer, "Failed to start retry timer");
            // Sending the join command if retry timer failed to start
            if (wfx_connect_to_ap() != SL_STATUS_OK)
            {
                ChipLogError(DeviceLayer, "wfx_connect_to_ap() failed.");
            }
            return;
        }
#if CHIP_CONFIG_ENABLE_ICD_SERVER && SLI_SI91X_MCU_INTERFACE
        wfx_rsi_power_save(RSI_SLEEP_MODE_8, STANDBY_POWER_SAVE_WITH_RAM_RETENTION);
#endif // CHIP_CONFIG_ENABLE_ICD_SERVER && SLI_SI91X_MCU_INTERFACE
        ChipLogProgress(DeviceLayer, "wfx_retry_connection : Next attempt after %d Seconds", retryInterval);
        retryInterval += retryInterval;
        return;
    }
}