92       ctx_(context),  in HeartbeatHandler()
120     interval_timer_->set_duration(interval_duration_ + ctx_->current_rto());  in RestartTimer()
134   ctx_->Send(ctx_->PacketBuilder().Add(  in HandleHeartbeatRequest()
142     ctx_->callbacks().OnError(  in HandleHeartbeatAck()
150     ctx_->callbacks().OnError(ErrorKind::kParseFailed,  in HandleHeartbeatAck()
156   TimeMs now = ctx_->callbacks().TimeMillis();  in HandleHeartbeatAck()
158     ctx_->ObserveRTT(now - info->created_at());  in HandleHeartbeatAck()
164   ctx_->ClearTxErrorCounter();  in HandleHeartbeatAck()
168   if (ctx_->is_connection_established()) {  in OnIntervalTimerExpiry()
169     HeartbeatInfo info(ctx_->callbacks().TimeMillis());  in OnIntervalTimerExpiry()
170     timeout_timer_->set_duration(ctx_->current_rto());  in OnIntervalTimerExpiry()
179     ctx_->Send(ctx_->PacketBuilder().Add(  in OnIntervalTimerExpiry()
193   ctx_->IncrementTxErrorCounter("HEARTBEAT timeout");  in OnTimeoutTimerExpiry()