82 lines
4.2 KiB
Markdown
82 lines
4.2 KiB
Markdown
# ESP-NETIF architecture
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| (A) USER CODE |
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.............| init settings events |
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. +----------------------------------------+
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. . | *
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. . V *
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--------+ +===========================+ * +-----------------------+
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| | new/config get/set | * | |
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| | |...*.....| init |
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| |---------------------------| * | |
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init | | |**** | |
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start |********| event handler |*********| DHCP |
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stop | | | | |
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| |---------------------------| | |
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| | | | NETIF |
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+-----| | | +-----------------+ |
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| glue|----<---| esp_netif_transmit |--<------| netif_output | |
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| | | | | | |
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| |---->---| esp_netif_receive |-->------| netif_input | |
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| | | | + ----------------+ |
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| |....<...| esp_netif_free_rx_buffer |...<.....| packet buffer |
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+-----| | | | |
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(B) | | | +-----------------------+
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--------+ +===========================+
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communication NETWORK STACK
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DRIVER ESP-NETIF
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## Components:
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### A) User code, boiler plate
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Overall application interaction with communication media and network stack
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* initialization code
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- create a new instance of ESP-NETIF
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- configure the object with
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1) netif specific options (flags, behaviour, name)
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2) network stack options (netif init and input functions, not publicly available)
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3) IO driver specific options (transmit, tx_free functions, IO driver handle)
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- setup event handlers
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- use default handlers for common interfaces defined in IO drivers; or define a specific handlers
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for customised behaviour/new interfaces
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- register handlers for app related events (such as IP lost/acquired)
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- interact with network interfaces using ESP-NETIF API
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### B) Communication driver, IO driver, media driver
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* event handler
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- define behaviour patterns of interaction with ESP-NETIF (example: ehternet link-up -> turn netif on)
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* glue IO layer: adapt the input/output functions to use esp-netif transmit/input/free_rx
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- install driver_transmit to appropriate ESP-NETIF object, so that outgoing packets from
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network stack are passed to the IO driver
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- calls esp_netif_receive to pass incoming data to network stack
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### C) ESP-NETIF, former tcpip_adapter
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* init API (new, configure)
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* IO API: for passing data between IO driver and network stack
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* event/action API (esp-netif lifecycle management)
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- building blocks for designing event handlers
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* setters, getters
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* network stack abstraction: enabling user interaction with TCP/IP stack
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- netif up/down
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- DHCP server, client
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- DNS API
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* driver conversion utilities
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### D) Network stack: no public interaction with user code (wrtt interfaces)
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## Data/event flow:
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* `........` Initialization line from user code to esp-netif and comm driver
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* `--<--->--` Data packets going from communication media to TCP/IP stack and back
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* `********` Events agregated in ESP-NETIP propagates to driver, user code and network stack
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* `|` User settings and runtime configuration
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