海耶斯AT命令：检测远程挂机？ [英] Hayes AT Commands: Detect Remote Hangup?

问题描述

你是如何认为当您的呼叫远程调制解调器挂断以编程方式检测？我写一个C程序，其与软调制解调器设备的/ dev / ttySL0 在Ubuntu Linux操作系统的接口。我能够使用配置海耶斯调制解调器AT命令，并与远程调制解调器通信。不过，我一直无法确定，我应该如何检测另一端已经挂了线。

How are you supposed to programatically detect when the remote modem on your call hangs up? I am writing a C program which interfaces with a SoftModem device /dev/ttySL0 in Ubuntu linux. I am able to configure the modem using Hayes AT commands and communicate with the remote modem. However, I haven't been able to determine how I'm supposed to detect that the other end has hung up the line.

我的调制解调器配置，这样，当另一端挂断了电话，设备打印 NO CARRIER 并切换到命令模式。但是，我不能使用 NO CARRIER 字符串，因为我不能保证调制解调器不会收到该字符串，而在数据模式。

I have the modem configured so that when the other end hangs up, the device prints NO CARRIER and switches to command mode. However, I can't use the NO CARRIER string because I can't guarantee that the modem won't receive that string while in data mode.

你是如何听远程挂断？

推荐答案

测试了 NO CARRIER 文字是不够的。本文频繁出现在净网站甚至Q＆安培; A网站

Testing for NO CARRIER as text will not suffice. This text frequently occurs on sites in the net, even on Q&A sites.

从调制解调器的到来，它应该包含在换行。

Coming from the modem, it should be enclosed in line breaks.

此外，您发现该文本后，你可以尝试切换到命令模式与 +++ 。如果这样的作品，您的连接仍然存在，您可以重新连接并继续使用它。如果没有（因为你已经在那里和 +++ 是一个无效的命令），连接已经一去不复返了。

Besides, after you detect that text, you can try to switch to command mode with +++. If that works, your connection persists and you can reattach it and continue using it. If it doesn't (because you are already there and +++ is an invalid command), the connection has gone.

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