ulwip - lwip integration in user space (under development)#

Adapted Air780E Air780EP

Note

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Example

--[[
Note: This library is under development and the interface may change at any time.
LWIP integration in user space, which is used to support network integration of lwip's netif to directly control the sending and receiving of MAC packets/IP packets in lua code.

The overall data path is as follows

lua Code-> ulwip.input -> lwip(netif->input) -> lwip processing logic-> luatos socket framework

lua code <- ulwip callback function <- lwip(netif->low_level_output) <- lwip processing logic <- luatos socket framework

Application example:
1. Air601 The wifi module of is used as the controlled terminal to send and receive MAC packets through UART/SPI to realize the function of Air780E/Air780EP integrated wifi module
2. Use Ethernet modules such as W5500/CH395/ENC28J60 to control the mac packet sending and receiving in the user's lua code and integrate it into the luatos socket framework
3. Through the Bluetooth module, integrated lowpan6

-- In development, please pay attention https://github.com/wendal/xt804-spinet
]]

ulwip.setup(adapter_index, mac, output_lua_ref, opts)#

Initialization lwip netif

Parameters

Incoming Value Type

Explanation

int

adapter_index Adapter Number

string

mac network card mac address

function

output_lua_ref callback function with parameters(adapter_index, data)

table

Additional parameters, such {mtu=1500, flags=(ulwip.FLAG_BROADCAST | ulwip.FLAG_ETHARP)}

Return Value

return value type

explanation

boolean

Success or not

Examples

-- Initialize an adapter and set the callback function
ulwip.setup(socket.LWIP_STA, string.fromHex("18fe34a27b69"), function(adapter_index, data)
    log.info("ulwip", "output_lua_ref", adapter_index, data:toHex())
end)
-- Note that after setup, the state of netif is down, and only after ulwip.updown(adapter_index, true) is called can data be sent and received normally.

-- Additional Parameters Configuring table Optional Values
-- mtu, Default 1460
-- flags, Default ulwip.FLAG_BROADCAST | ulwip.FLAG_ETHARP | ulwip.FLAG_ETHERNET | ulwip.FLAG_IGMP | ulwip.FLAG_MLD6
-- zbuff_out The callback function accepts zbuff as an argument, and the default false
-- reverse Local lwip device, flip call logic, default false, this parameter is designed to intercept the hardware networking data of the current device

ulwip.updown(adapter_index, up)#

Set the state of netif

Parameters

Incoming Value Type

Explanation

int

adapter_index Adapter Number

boolean

up true is up, false is down

Return Value

return value type

explanation

boolean

Success or not

Examples

-- Reference ulwip.setup

ulwip.input(adapter_index, data, len, offset)#

Enter data to netif

Parameters

Incoming Value Type

Explanation

int

adapter_index Adapter Number

string/userdata

data Data entered

int

If data is zbuff, len is used of zbuff by default, which is invalid for string.

int

If data is zbuff, offset is the starting position of data, the default value is 0, which is invalid for string.

Return Value

return value type

explanation

boolean

Success or not

Examples

-- Reference ulwip.setup

ulwip.dhcp(adapter_index, up)#

Startup or Shutdown dhcp

Parameters

Incoming Value Type

Explanation

int

adapter_index Adapter Number

boolean

up true to start, false to close

Return Value

return value type

explanation

boolean

Current Status

Examples

-- Reference ulwip.setup

ulwip.ip(adapter_index, ip, netmask, gw)#

set or obtain ip information

Parameters

Incoming Value Type

Explanation

int

adapter_index Adapter Number

string

ip IP Address, which can be left blank when obtaining only

string

netmask Subnet mask, which can be left blank when only obtaining

string

gw Gateway address, which can be left blank when obtaining only

Return Value

return value type

explanation

string

ip address, subnet mask, gateway address

Examples

-- Get Existing Value
local ip, netmask, gw = ulwip.ip(socket.LWIP_STA)
-- Set New Value
ulwip.ip(socket.LWIP_STA, "192.168.0.1", "255.255.255.0", "192.168.0.1")

ulwip.reg(adapter_index)#

register netif to luatos socket

Parameters

Incoming Value Type

Explanation

int

adapter_index Adapter Number

Return Value

return value type

explanation

boolean

Success or not

Examples

-- Reference ulwip.setup

ulwip.xt804_xfer(spi_id, cs_pin, addr, zbuff, len, offset, auto_seek, auto_len)#

Operation XT804 for SPI fast transceiver

Parameters

Incoming Value Type

Explanation

int

spi_id SPI The ID number

int

cs_pin CS GPIO number of the foot

int

addr register address

zbuff

zbuff Object

int

len Length

int

offset offset, default buff:used()

boolean

auto_seek Whether to move offset automatically, default false

int

auto_len Automatic slice length, automatically selected by register by default

Return Value

return value type

explanation

nil

No return value

Examples

-- This function is an auxiliary function