for {
		var toSend []byte
		select {
		case <-ctx.Done():
			return
		case <-ping.C:
			if c.State() != StateConnected {
				continue
			}
			lastPong := atomic.LoadInt64(&c.LastPong)
			if lastPong > 0 {
				lastPongTime := time.Unix(0, lastPong)
				if d := time.Since(lastPongTime); d > connPingInterval*2 {

pkg sync/atomic, func CompareAndSwapUint64(*uint64, uint64, uint64) bool
pkg sync/atomic, func CompareAndSwapUintptr(*uintptr, uintptr, uintptr) bool
pkg sync/atomic, func LoadInt32(*int32) int32
pkg sync/atomic, func LoadInt64(*int64) int64
pkg sync/atomic, func LoadPointer(*unsafe.Pointer) unsafe.Pointer
pkg sync/atomic, func LoadUint32(*uint32) uint32
pkg sync/atomic, func LoadUint64(*uint64) uint64