mirror of
https://github.com/espressif/esp-protocols.git
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docs(esp_modem): updated documents to show missed topics
This commit is contained in:
@ -17,5 +17,5 @@ Get started with one of the examples:
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## Documentation
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* Continue with esp-modem [brief overview](docs/README.md)
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* View the full [html documentation](https://espressif.github.io/esp-protocols/esp_modem/index.html)
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* Continue with esp-modem [brief overview](https://github.com/espressif/esp-protocols/tree/master/docs/esp_modem/en/README.rst)
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* View the full [html documentation](https://docs.espressif.com/projects/esp-protocols/esp_modem/docs/latest/index.html)
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@ -1,92 +0,0 @@
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# ESP MODEM
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This component is used to communicate with modems in the command mode (using AT commands), as well as the data mode
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(over PPPoS protocol).
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The modem device is modeled with a DCE (Data Communication Equipment) object, which is composed of:
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* DTE (Data Terminal Equipment), which abstracts the terminal (currently only UART implemented).
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* PPP Netif representing a network interface communicating with the DTE using PPP protocol.
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* Module abstracting the specific device model and its commands.
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```
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+-----+
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| DTE |--+
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+-----+ | +-------+
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+-->| DCE |
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+-------+ | |o--- set_mode(command/data)
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| Module|--->| |
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+-------+ | |o--- send_commands
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+->| |
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+------+ | +-------+
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| PPP |--+
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| netif|------------------> network events
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+------+
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```
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## Modem components
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### DCE
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This is the basic operational unit of the esp_modem component, abstracting a specific module in software,
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which is basically configured by
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* the I/O communication media (UART), defined by the DTE configuration
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* the specific command library supported by the device model, defined with the module type
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* network interface configuration (PPPoS config in lwip)
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After the object is created, the application interaction with the DCE is in
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* issuing specific commands to the modem
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* switching between data and command mode
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### DTE
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Is an abstraction of the physical interface connected to the modem. Current implementation supports only UART
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### PPP netif
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Is used to attach the specific network interface to a network communication protocol used by the modem. Currently implementation supports only PPPoS protocol.
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### Module
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Abstraction of the specific modem device. Currently the component supports SIM800, BG96, SIM7600.
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## Use cases
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Users interact with the esp-modem using the DCE's interface, to basically
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* Switch between command and data mode to connect to the internet via cellular network.
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* Send various commands to the device (e.g. send SMS)
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The applications typically register handlers for network events to receive notification on the network availability and
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IP address changes.
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Common use cases of the esp-modem are also listed as the examples:
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* `examples/pppos_client` -- simple client which reads some module properties and switches to the data mode to connect to a public mqtt broker.
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* `examples/modem_console` -- is an example to exercise all possible module commands in a console application.
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* `examples/ap_to_pppos` -- this example focuses on the network connectivity of the esp-modem and provides a WiFi AP that forwards packets (and uses NAT) to and from the PPPoS connection.
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## Extensibility
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### CMUX
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Implementation of virtual terminals is an experimental feature, which allows users to also issue commands in the data mode,
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after creating multiple virtual terminals, designating some of them solely to data mode, others solely to command mode.
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### DTE's
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Currently, we support only UART (and USB as a preview feature), but modern modules support other communication interfaces, such as USB, SPI.
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### Other devices
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Adding a new device is a must-have requirement for the esp-modem component. Different modules support different commands,
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or some commands might have a different implementation. Adding a new device means to provide a new implementation
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as a class derived from `GenericModule`, where we could add new commands or modify the existing ones.
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## Configuration
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Modem abstraction is configurable both compile-time and run-time.
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### Component Kconfig
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Compile-time configuration is provided using menuconfig. Please check the description for the CMUX mode configuration options.
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### Runtime configuration
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Is defined using standard configuration structures for `DTE` and `DCE` objects separately. Please find documentation of
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* :cpp:class:`esp_modem_dte_config_t`
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* :cpp:class:`esp_modem_dce_config_t`
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Before Width: | Height: | Size: 26 KiB After Width: | Height: | Size: 26 KiB |
Before Width: | Height: | Size: 139 KiB After Width: | Height: | Size: 139 KiB |
132
docs/esp_modem/en/README.rst
Normal file
132
docs/esp_modem/en/README.rst
Normal file
@ -0,0 +1,132 @@
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ESP MODEM
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=========
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This component is used to communicate with modems in the command mode
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(using AT commands), as well as the data mode (over PPPoS protocol). The
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modem device is modeled with a DCE (Data Communication Equipment)
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object, which is composed of:
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- DTE (Data Terminal Equipment), which abstracts the terminal (currently only UART implemented).
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- PPP Netif representing a network interface communicating with the DTE using PPP protocol.
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- Module abstracting the specific device model and its commands.
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::
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+-----+
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| DTE |--+
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+-----+ | +-------+
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+-->| DCE |
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+-------+ | |o--- set_mode(command/data)
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| Module|--->| |
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+-------+ | |o--- send_commands
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+->| |
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+------+ | +-------+
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| PPP |--+
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| netif|------------------> network events
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+------+
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Modem components
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----------------
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DCE
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~~~
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This is the basic operational unit of the esp_modem component,
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abstracting a specific module in software, which is basically configured
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by
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- the I/O communication media (UART), defined by the DTE configuration
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- the specific command library supported by the device model, defined with the module type
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- network interface configuration (PPPoS config in lwip)
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After the object is created, the application interaction with the DCE is
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in
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- issuing specific commands to the modem
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- switching between data and command mode
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DTE
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~~~
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Is an abstraction of the physical interface connected to the modem.
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Current implementation supports only UART
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PPP netif
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~~~~~~~~~
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Is used to attach the specific network interface to a network
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communication protocol used by the modem. Currently implementation
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supports only PPPoS protocol.
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Module
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~~~~~~
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Abstraction of the specific modem device. Currently the component
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supports SIM800, BG96, SIM7600.
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Use cases
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---------
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Users interact with the esp-modem using the DCE’s interface, to
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basically
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- Switch between command and data mode to connect to the internet via cellular network.
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- Send various commands to the device (e.g. send SMS)
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The applications typically register handlers for network events to
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receive notification on the network availability and IP address changes.
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Common use cases of the esp-modem are also listed as the examples:
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- ``examples/pppos_client`` – simple client which reads some module properties and switches to the data mode to connect to a public mqtt broker.
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- ``examples/modem_console`` – is an example to exercise all possible module commands in a console application.
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- ``examples/ap_to_pppos`` – this example focuses on the network
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connectivity of the esp-modem and provides a WiFi AP that forwards
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packets (and uses NAT) to and from the PPPoS connection.
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Extensibility
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-------------
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CMUX
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~~~~
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Implementation of virtual terminals is an experimental feature, which
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allows users to also issue commands in the data mode, after creating
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multiple virtual terminals, designating some of them solely to data
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mode, others solely to command mode.
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DTE’s
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~~~~~
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Currently, we support only UART (and USB as a preview feature), but
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modern modules support other communication interfaces, such as USB, SPI.
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Other devices
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~~~~~~~~~~~~~
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Adding a new device is a must-have requirement for the esp-modem
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component. Different modules support different commands, or some
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commands might have a different implementation. Adding a new device
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means to provide a new implementation as a class derived from
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``GenericModule``, where we could add new commands or modify the
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existing ones.
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Configuration
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-------------
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Modem abstraction is configurable both compile-time and run-time.
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Component Kconfig
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~~~~~~~~~~~~~~~~~
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Compile-time configuration is provided using menuconfig. Please check
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the description for the CMUX mode configuration options.
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Runtime configuration
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~~~~~~~~~~~~~~~~~~~~~
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Is defined using standard configuration structures for ``DTE`` and
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``DCE`` objects separately. Please find documentation of
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- :cpp:class:``esp_modem_dte_config_t``
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- :cpp:class:``esp_modem_dce_config_t``
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@ -1,36 +0,0 @@
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# Internal design
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## Design decisions
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* Use C++ with additional C API
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* Use exceptions
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- Use macro wrapper over `try-catch` blocks when exceptions off (use `abort()` if `THROW()`)
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* Initializes and allocates in the constructor (might throw)
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- easier code with exceptions ON, with exceptions OFF alloc/init failures are not treated as runtime error (program aborts)
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- break down long initialization in constructor into more private methods
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* Implements different devices using inheritance from `GenericModule`, which is the most general implementation of a common modem
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- Internally uses templates with device specialization (modeled as `DCE<SpecificModule>`) which could be used as well for some special cases,
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such as implantation of a minimal device (ModuleIf), add new AT commands (oOnly in compile time), or using the Module with DTE only (no DCE, no Netif) for sending AT commands without network
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## DCE collaboration model
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The diagram describes how the DCE class collaborates with DTE, PPP and the device abstraction
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## Terminal inheritance
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Terminal is a class which can read or write data, and can handle callbacks when data are available. UART specialization
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is provided implementing these method using the uart driver.
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## CMUX terminal
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The below diagram depicts the idea of using CMUX terminal mode using the CMuxInstance class which is a terminal
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(it implements the basic read/write methods) interfacing arbitrary number of virtual terminals,
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but at the same time it is also composed of CMux class, which consumes the original terminal and uses its read/write methods
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to multiplex the terminal.
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|
63
docs/esp_modem/en/internal_design.rst
Normal file
63
docs/esp_modem/en/internal_design.rst
Normal file
@ -0,0 +1,63 @@
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Internal design
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===============
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Design decisions
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----------------
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- Use C++ with additional C API
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- Use exceptions
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- Use macro wrapper over ``try-catch`` blocks when exceptions off
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(use ``abort()`` if ``THROW()``)
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- Initializes and allocates in the constructor (might throw)
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- easier code with exceptions ON, with exceptions OFF alloc/init
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failures are not treated as runtime error (program aborts)
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- break down long initialization in constructor into more private
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methods
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- Implements different devices using inheritance from
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``GenericModule``, which is the most general implementation of a
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common modem
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- Internally uses templates with device specialization (modeled as
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``DCE<SpecificModule>``) which could be used as well for some
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special cases, such as implantation of a minimal device
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(ModuleIf), add new AT commands (oOnly in compile time), or using
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the Module with DTE only (no DCE, no Netif) for sending AT
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commands without network
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DCE collaboration model
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-----------------------
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The diagram describes how the DCE class collaborates with DTE, PPP and
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the device abstraction
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.. figure:: DCE_DTE_collaboration.png
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:alt: DCE_architecture
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DCE_architecture
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Terminal inheritance
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--------------------
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Terminal is a class which can read or write data, and can handle
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callbacks when data are available. UART specialization is provided
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implementing these method using the uart driver.
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CMUX terminal
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-------------
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The below diagram depicts the idea of using CMUX terminal mode using the
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CMuxInstance class which is a terminal (it implements the basic
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read/write methods) interfacing arbitrary number of virtual terminals,
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but at the same time it is also composed of CMux class, which consumes
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the original terminal and uses its read/write methods to multiplex the
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terminal.
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.. figure:: CMux_collaboration.png
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:alt: CMUX Terminal
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CMUX Terminal
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@ -1,21 +1,72 @@
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# Cleanup the generated html
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rm -rf html
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# Generate C++ API header of the DCE
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cat esp_modem_command_declare.inc | clang++ -E -P -CC -xc++ -I../../components/esp_modem/include -DGENERATE_DOCS - | sed -n '1,/DCE command documentation/!p' > en/esp_modem_dce.hpp
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# Generate C API header of the modem_api.h
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cat esp_modem_command_declare.inc | clang -E -P -CC -xc -I../../components/esp_modem/include -DGENERATE_DOCS - | sed -n '1,/DCE command documentation/!p' > en/esp_modem_api_commands.h
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# RST with links to C++ API
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cat esp_modem_command_declare.inc | clang -E -P -xc -I../../components/esp_modem/include -DGENERATE_DOCS -DGENERATE_RST_LINKS - | sed 's/NL/\n/g' > en/cxx_api_links.rst
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build-docs --target esp32 --language en
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cp -rf _build/en/esp32/html .
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rm -rf _build __pycache__
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## Modifes some version and target fields of index.html
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#echo "<script type="text/javascript">
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#window.onload =(function() {
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# var myAnchor = document.getElementById('version-select');
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# var mySpan = document.createElement('input');
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# mySpan.setAttribute('type', 'text');
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# mySpan.setAttribute('maxLength', '10');
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# mySpan.value = 'latest';
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# mySpan.setAttribute('disabled', true);
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# myAnchor.parentNode.replaceChild(mySpan, myAnchor);
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#
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# var myAnchor = document.getElementById('target-select');
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# var mySpan = document.createElement('input');
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# mySpan.setAttribute('type', 'text');
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# mySpan.setAttribute('maxLength', '10');
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# mySpan.value = 'all targets';
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# mySpan.setAttribute('disabled', true);
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# myAnchor.parentNode.replaceChild(mySpan, myAnchor);
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#
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#})();
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#</script>" >> html/index.html
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# Modifes some version and target fields of index.html
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echo "<script type="text/javascript">
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echo "<script type='text/javascript'>
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window.onload =(function() {
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var myAnchor = document.getElementById('version-select');
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var mySpan = document.createElement('input');
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mySpan.setAttribute('type', 'text');
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mySpan.setAttribute('maxLength', '10');
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mySpan.value = 'latest';
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mySpan.setAttribute('disabled', true);
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var mySpan = document.createElement('select');
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mySpan.style.float = 'left';
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latest_ver = document.createElement('option');
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latest_ver.value = 'latest';
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latest_ver.textContent = 'latest(master)';
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mySpan.append(latest_ver);
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var myArray = ['v1.0.0''];
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for (var i = myArray.length - 1; i >= 0; i--) {
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current_ver = document.createElement('option');
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current_ver.value = myArray[i];
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current_ver.textContent = 'release-'+myArray[i];
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mySpan.append(current_ver);
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}
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myAnchor.parentNode.replaceChild(mySpan, myAnchor);
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mySpan.addEventListener('change', function() {
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window.location.href='https://docs.espressif.com/projects/esp-protocols/esp_modem/docs/'+event.target.value+'/index.html'
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||||
});
|
||||
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||||
var myAnchor = document.getElementById('target-select');
|
||||
var mySpan = document.createElement('input');
|
||||
mySpan.style.float = 'left';
|
||||
mySpan.setAttribute('type', 'text');
|
||||
mySpan.setAttribute('maxLength', '10');
|
||||
mySpan.value = 'all targets';
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||||
@ -23,4 +74,4 @@ window.onload =(function() {
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||||
myAnchor.parentNode.replaceChild(mySpan, myAnchor);
|
||||
|
||||
})();
|
||||
</script>" >> html/index.html
|
||||
</script>" >> html/index.html
|
||||
|
Reference in New Issue
Block a user