wifi_watchdog_policy.h

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#ifndef SENSESP_SRC_SENSESP_SYSTEM_WIFI_WATCHDOG_POLICY_H_
#define SENSESP_SRC_SENSESP_SYSTEM_WIFI_WATCHDOG_POLICY_H_
 
#include <cstdint>
 
#include "sensesp/net/wifi_state.h"
 
namespace sensesp {
 
enum class WiFiWatchdogLink { kUp, kDown, kNeutral };
 
inline WiFiWatchdogLink wifi_watchdog_link_from_state(WiFiState state) {
  switch (state) {
    case WiFiState::kWifiConnectedToAP:
      return WiFiWatchdogLink::kUp;
    case WiFiState::kWifiNoAP:
    case WiFiState::kWifiDisconnected:
      return WiFiWatchdogLink::kDown;
    case WiFiState::kWifiAPModeActivated:
    case WiFiState::kWifiManagerActivated:
      return WiFiWatchdogLink::kNeutral;
  }
  return WiFiWatchdogLink::kNeutral;
}
 
class WiFiWatchdogPolicy {
 public:
  void set_link_state(WiFiWatchdogLink link, uint32_t now_ms) {
    switch (link) {
      case WiFiWatchdogLink::kUp:
        armed_ = true;
        down_ = false;
        break;
      case WiFiWatchdogLink::kDown:
        if (!down_) {
          down_ = true;
          down_since_ms_ = now_ms;
        }
        break;
      case WiFiWatchdogLink::kNeutral:
        down_ = false;
        break;
    }
  }
 
  bool restart_due(uint32_t now_ms, uint32_t timeout_ms) const {
    if (timeout_ms == 0 || !armed_ || !down_) {
      return false;
    }
    return static_cast<uint32_t>(now_ms - down_since_ms_) >= timeout_ms;
  }
 
 private:
  bool armed_ = false;
  bool down_ = false;
  uint32_t down_since_ms_ = 0;
};
 
}  // namespace sensesp
 
#endif  // SENSESP_SRC_SENSESP_SYSTEM_WIFI_WATCHDOG_POLICY_H_