agent/acs/handler/payload_handler.go
func (payloadHandler *payloadRequestHandler) sendAcks() {
	for {
		select {
		case mid := <-payloadHandler.ackRequest:
			payloadHandler.ackMessageId(mid)
		case <-payloadHandler.ctx.Done():
			return
		}
	}
}
func (payloadHandler *payloadRequestHandler) sendAcks() {
	for {
		select {
		case mid := <-payloadHandler.ackRequest:
			payloadHandler.ackMessageId(mid)
		case <-payloadHandler.ctx.Done():
			return
		}
	}
}
// sendAcks sends ack requests to ACS