modem_console

# Modem console example

## Overview

This example is mainly targets experimenting with a modem device, sending custom commands and switching to PPP mode using esp-console, command line API.
Please check the list of supported commands using `help` command.

This example implements two very simple network commands to demonstrate and test basic network functionality.
* `httpget`: Connect and get http content
* `ping`: Send ICMP pings

To demonstrate creating custom modem devices, this example creates a DCE object using a locally defined create method,
that sets up the DCE based on a custom module implemented in the `my_module_dce.hpp` file. The module class only overrides
`get_module_name()` method supplying a user defined name, but keeps all other commands the same as defined in the `GenericModule`
class.

### USB DTE support

For USB enabled targets (ESP32-S2, ESP32-S3, or ESP32-P4), it is possible to connect to the modem device via USB.
1. In menuconfig, navigate to `Example Configuration->Type of serial connection to the modem` and choose `USB`.
2. Connect the modem USB signals to your ESP chip (pin 19 (DATA-) and 20 (DATA+) for ESP32-S2/S3).

USB example uses Quactel BG96 modem device. BG96 needs a positive pulse on its PWK pin to boot-up.

This example supports USB modem hot-plugging and reconnection. There is one limitation coming from esp_console component:
When esp_console REPL is being destroyed (after USB mode disconnection or after `exit` command), it will block on UART read.
You must send a character to it (via idf.py monitor), so it unblocks and properly exits.