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