由于Python绑定模拟了逻辑接口，所以不可能不通过一个服务来发送信号。
Because the Python bindings model the logical interface, it is not possible to send a signal without it coming from a service. So this example also creates a service.
我们在一个不通手机信号的荒岛上度过了两个晚上。 。
We spent two nights on a deserted island unreachable by cellphone.
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