版本4加入私用通道，传输用来签署密码编译金钥和讯息的数位签章。
Version 4 adds a private channel to transmit a digital signature to sign cryptographic keys and messages.
活动可设定时发生的一个条件得到满足例如，激活接力高报警，计时器开始批量启动或添加讯息显示了通信通道超时；
Events can be set to occur when a condition is met eg activate a relay on high alarm, start a timer on batch start or add a message to the display on a comms channel timeout;
当接收者到达这个限制时，到达基础通道的新讯息将不会被接受。
When this limit is reached on the receiver, new messages that arrive on the underlying channel are not accepted.
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