2023-10-23 19:21:37 +02:00
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====================
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2023-10-21 12:24:43 +02:00
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``chat`` AT over TTY
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====================
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Demonstrates AT chat functionality over a TTY device. This is useful with AT
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modems, for example, to establish a ``pppd`` connection (see the related ``pppd``
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example). Moreover, some AT modems – such as ones made by u-blox – have an
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internal TCP/IP stack, often with an implementation of TLS/SSL. In such cases
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the chat utility can be used to configure the internal TCP/IP stack, establish
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socket connections, set up security (e.g., download base64-encoded certificates
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to the modem), and perform data exchange through sockets over the TTY device.
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Useful configuration parameters:
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- ``CONFIG_EXAMPLES_CHAT_PRESET[0..3]`` – preset chat scripts.
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- ``CONFIG_EXAMPLES_CHAT_TTY_DEVNODE`` – TTY device node name.
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- ``CONFIG_EXAMPLES_CHAT_TIMEOUT_SECONDS`` – default receive timeout.
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