EMACInterface class Implementation of the NetworkInterface for an EMAC-based driver. More...

#include <EMACInterface.h>

Inheritance diagram for EMACInterface:

Public Types
typedef mbed::Callback< void(nsapi_value_or_error_t result, SocketAddress *address)>	hostbyname_cb_t
	Hostname translation callback (for use with gethostbyname_async()). More...

Public Member Functions
	EMACInterface (EMAC &emac=EMAC::get_default_instance(), OnboardNetworkStack &stack=OnboardNetworkStack::get_default_instance())
	Create an EMAC-based network interface. More...

nsapi_error_t	set_network (const SocketAddress &ip_address, const SocketAddress &netmask, const SocketAddress &gateway) override
	Set a static IP address. More...

nsapi_error_t	set_dhcp (bool dhcp) override
	Enable or disable DHCP on the network. More...

nsapi_error_t	connect () override
	Connect to a network. More...

nsapi_error_t	disconnect () override
	Disconnect from the network. More...

const char *	get_hostname () override
	Get hostname. More...

nsapi_error_t	set_hostname (const char *hostname) override
	Set hostname. More...

const char *	get_mac_address () override
	Get the local MAC address. More...

nsapi_error_t	set_mac_address (uint8_t *mac_addr, nsapi_size_t addr_len) override
	Set the MAC address to the interface. More...

nsapi_error_t	get_ip_address (SocketAddress *address) override
	Get the local IP address. More...

nsapi_error_t	get_ipv6_link_local_address (SocketAddress *address) override
	Get the IPv6 link local address. More...

nsapi_error_t	get_netmask (SocketAddress *address) override
	Get the local network mask. More...

nsapi_error_t	get_gateway (SocketAddress *address) override
	Get the local gateway. More...

char *	get_interface_name (char *interface_name) override
	Get the network interface name. More...

void	set_as_default () override
	Set network interface as default one. More...

void	attach (mbed::Callback< void(nsapi_event_t, intptr_t)> status_cb) override
	Register callback for status reporting. More...

nsapi_connection_status_t	get_connection_status () const override
	Get the connection status. More...

nsapi_error_t	set_blocking (bool blocking) override
	Set asynchronous operation of connect() and disconnect() calls. More...

EMAC &	get_emac () const
	Provide access to the EMAC. More...

EMACInterface *	emacInterface () final
	Return pointer to an EMACInterface. More...

virtual nsapi_error_t	gethostbyname (const char host, SocketAddress address, nsapi_version_t version=NSAPI_UNSPEC, const char *interface_name=NULL)
	Translate a hostname to an IP address with specific version using network interface name. More...

virtual nsapi_value_or_error_t	getaddrinfo (const char hostname, SocketAddress hints, SocketAddress *res, const char interface_name=NULL)
	Translate a hostname to the multiple IP addresses with specific version using network interface name. More...

virtual nsapi_value_or_error_t	gethostbyname_async (const char host, hostbyname_cb_t callback, nsapi_version_t version=NSAPI_UNSPEC, const char interface_name=NULL)
	Translate a hostname to an IP address (asynchronous) using network interface name. More...

virtual nsapi_value_or_error_t	getaddrinfo_async (const char hostname, SocketAddress hints, hostbyname_cb_t callback, const char *interface_name=NULL)
	Translate a hostname to the multiple IP addresses (asynchronous) using network interface name. More...

virtual nsapi_error_t	gethostbyname_async_cancel (int id)
	Cancel asynchronous hostname translation. More...

virtual nsapi_error_t	add_dns_server (const SocketAddress &address, const char *interface_name)
	Add a domain name server to list of servers to query. More...

virtual nsapi_error_t	get_dns_server (int index, SocketAddress address, const char interface_name=NULL)
	Get a domain name server from a list of servers to query. More...

void	add_event_listener (mbed::Callback< void(nsapi_event_t, intptr_t)> status_cb)
	Add event listener for interface. More...

virtual EthInterface *	ethInterface ()
	Return pointer to an EthInterface. More...

virtual WiFiInterface *	wifiInterface ()
	Return pointer to a WiFiInterface. More...

virtual MeshInterface *	meshInterface ()
	Return pointer to a MeshInterface. More...

virtual CellularInterface *	cellularInterface ()
	Return pointer to a CellularInterface. More...

virtual void	set_default_parameters ()
	defined(DOXYGEN_ONLY) More...

Static Public Member Functions
static NetworkInterface *	get_default_instance ()
	Return the default network interface. More...

Protected Member Functions
NetworkStack *	get_stack () final
	Provide access to the underlying stack. More...

Detailed Description

EMACInterface class Implementation of the NetworkInterface for an EMAC-based driver.

This class provides the necessary glue logic to create a NetworkInterface based on an EMAC and an OnboardNetworkStack. EthernetInterface and EMAC-based Wi-Fi drivers derive from it.

Drivers derived from EMACInterface should be constructed so that their EMAC is functional without the need to call connect(). For example a Wi-Fi driver should permit WiFi::get_emac().power_up() as soon as the credentials have been set. This is necessary to support specialized applications such as 6LoWPAN mesh border routers.

Definition at line 42 of file EMACInterface.h.

Member Typedef Documentation

◆ hostbyname_cb_t

typedef mbed::Callback<void (nsapi_value_or_error_t result, SocketAddress *address)> hostbyname_cb_t

inherited

Hostname translation callback (for use with gethostbyname_async()).

Callback will be called after DNS resolution completes or a failure occurs.

Note: Callback should not take more than 10ms to execute, otherwise it might prevent underlying thread processing. A portable user of the callback should not make calls to network operations due to stack size limitations. The callback should not perform expensive operations such as socket recv/send calls or blocking operations.

result : Negative error code on failure, or value that represents the number of DNS records
address : On success, destination for the host SocketAddress.

Definition at line 303 of file NetworkInterface.h.

Constructor & Destructor Documentation

◆ EMACInterface()

EMACInterface	(	EMAC &	emac = `EMAC::get_default_instance()`,
		OnboardNetworkStack &	stack = `OnboardNetworkStack::get_default_instance()`
	)

Create an EMAC-based network interface.

The default arguments obtain the default EMAC, which will be target- dependent (and the target may have some JSON option to choose which is the default, if there are multiple). The default stack is configured by JSON option nsapi.default-stack.

Due to inability to return errors from the constructor, no real work is done until the first call to connect().

Parameters

emac	Reference to EMAC to use
stack	Reference to onboard-network stack to use

Member Function Documentation

◆ set_network()

nsapi_error_t set_network	(	const SocketAddress &	ip_address,
		const SocketAddress &	netmask,
		const SocketAddress &	gateway
	)

overridevirtual

Set a static IP address.

Configures this network interface to use a static IP address. Implicitly disables DHCP, which can be enabled in set_dhcp. Requires that the network is disconnected.

Parameters

ip_address	SocketAddress representation of the local IP address
netmask	SocketAddress representation of the local network mask
gateway	SocketAddress representation of the local gateway

Returns: 0 on success, negative error code on failure

Reimplemented from NetworkInterface.

◆ set_dhcp()

nsapi_error_t set_dhcp ( bool dhcp )

overridevirtual

Enable or disable DHCP on the network.

Requires that the network is disconnected

Parameters

dhcp	False to disable dhcp (defaults to enabled)

Return values

NSAPI_ERROR_OK	on success.
NSAPI_ERROR_UNSUPPORTED	if operation is not supported.

Reimplemented from NetworkInterface.

◆ connect()

nsapi_error_t connect ( )

overridevirtual

Connect to a network.

This blocks until connection is established, but asynchronous operation can be enabled by calling NetworkInterface::set_blocking(false).

In asynchronous mode this starts the connection sequence and returns immediately. Status of the connection can then checked from NetworkInterface::get_connection_status() or from status callbacks.

NetworkInterface internally handles reconnections until disconnect() is called.

Returns: NSAPI_ERROR_OK if connection established in blocking mode.; NSAPI_ERROR_OK if asynchronous operation started.; NSAPI_ERROR_BUSY if asynchronous operation cannot be started. Implementation guarantees event generation, which can be used as an trigger to reissue the rejected request.; NSAPI_ERROR_IS_CONNECTED if already connected.; negative error code on failure.

Implements NetworkInterface.

◆ disconnect()

nsapi_error_t disconnect ( )

overridevirtual

Disconnect from the network.

This blocks until interface is disconnected, unless interface is set to asynchronous (non-blocking) mode by calling NetworkInterface::set_blocking(false).

Returns: NSAPI_ERROR_OK on successfully disconnected in blocking mode.; NSAPI_ERROR_OK if asynchronous operation started.; NSAPI_ERROR_BUSY if asynchronous operation cannot be started. Implementation guarantees event generation, which can be used as an trigger to reissue the rejected request.; NSAPI_ERROR_NO_CONNECTION if already disconnected.; negative error code on failure.

Implements NetworkInterface.

◆ get_hostname()

const char * get_hostname ( )

overridevirtual

Get hostname.

Returns: Hostname if configured, null otherwise

Reimplemented from NetworkInterface.

◆ set_hostname()

nsapi_error_t set_hostname ( const char * hostname )

overridevirtual

Set hostname.

Parameters

hostname Hostname string

Return values

NSAPI_ERROR_OK	on success
NSAPI_ERROR_UNSUPPORTED	if this feature is not supported
NSAPI_ERROR_PARAMETER	if hostname is not valid
NSAPI_ERROR_BUSY	if hostname couldn't be set (e.g. for LwIP stack, hostname can only be set before calling `EthernetInterface::connect` method)

Reimplemented from NetworkInterface.

◆ get_mac_address()

const char * get_mac_address ( )

overridevirtual

Get the local MAC address.

Provided MAC address is intended for info or debug purposes and may be not provided if the underlying network interface does not provide a MAC address.

Returns: Null-terminated representation of the local MAC address or null if no MAC address is available.

Reimplemented from NetworkInterface.

◆ set_mac_address()

nsapi_error_t set_mac_address	(	uint8_t *	mac_addr,
		nsapi_size_t	addr_len
	)

overridevirtual

Set the MAC address to the interface.

Set the provided MAC address on the network interface. The address must be unique globally. The address must be set before calling the interface connect() method.

Not all interfaces are supporting MAC address set and an error is not returned for this method call. Verify the changed MAC address by checking packet captures from the used network interface.

6-byte EUI-48 MAC addresses are used for Ethernet while Mesh interface is using 8-byte EUI-64 address.

More information about obtaining MAC address can be found from: https://standards.ieee.org/products-services/regauth/index.html

Parameters

mac_addr	Buffer containing the MAC address in hexadecimal format.
addr_len	Length of provided buffer in bytes (6 or 8)

Return values

NSAPI_ERROR_OK	on success
NSAPI_ERROR_UNSUPPORTED	if this feature is not supported
NSAPI_ERROR_PARAMETER	if address is not valid
NSAPI_ERROR_BUSY	if address can't be set.

Reimplemented from NetworkInterface.

◆ get_ip_address()

nsapi_error_t get_ip_address ( SocketAddress * address )

overridevirtual

Get the local IP address.

Parameters

address SocketAddress representation of the local IP address

Return values

NSAPI_ERROR_OK	on success
NSAPI_ERROR_UNSUPPORTED	if this feature is not supported
NSAPI_ERROR_PARAMETER	if the provided pointer is invalid
NSAPI_ERROR_NO_ADDRESS	if the address cannot be obtained from stack

Reimplemented from NetworkInterface.

◆ get_ipv6_link_local_address()

nsapi_error_t get_ipv6_link_local_address ( SocketAddress * address )

overridevirtual

Get the IPv6 link local address.

Parameters

address SocketAddress representation of the link local IPv6 address

Return values

NSAPI_ERROR_OK	on success
NSAPI_ERROR_UNSUPPORTED	if this feature is not supported
NSAPI_ERROR_PARAMETER	if the provided pointer is invalid

Reimplemented from NetworkInterface.

◆ get_netmask()

nsapi_error_t get_netmask ( SocketAddress * address )

overridevirtual

Get the local network mask.

Parameters

address SocketAddress representation of netmask

Return values

NSAPI_ERROR_OK	on success
NSAPI_ERROR_UNSUPPORTED	if this feature is not supported
NSAPI_ERROR_PARAMETER	if the provided pointer is invalid
NSAPI_ERROR_NO_ADDRESS	if the address cannot be obtained from stack

Reimplemented from NetworkInterface.

◆ get_gateway()

nsapi_error_t get_gateway ( SocketAddress * address )

overridevirtual

Get the local gateway.

Parameters

address SocketAddress representation of gateway address

Return values

NSAPI_ERROR_OK	on success
NSAPI_ERROR_UNSUPPORTED	if this feature is not supported
NSAPI_ERROR_PARAMETER	if the provided pointer is invalid
NSAPI_ERROR_NO_ADDRESS	if the address cannot be obtained from stack

Reimplemented from NetworkInterface.

◆ get_interface_name()

char * get_interface_name ( char * interface_name )

overridevirtual

Get the network interface name.

Returns: Null-terminated representation of the network interface name or null if interface not exists

Reimplemented from NetworkInterface.

◆ set_as_default()

void set_as_default ( )

overridevirtual

Set network interface as default one.

Reimplemented from NetworkInterface.

◆ attach()

void attach ( mbed::Callback< void(nsapi_event_t, intptr_t)> status_cb )

overridevirtual

Register callback for status reporting.

The specified status callback function will be called on status changes on the network. The parameters on the callback are the event type and event-type dependent reason parameter. Only one callback can be registered at a time.

To unregister a callback call with status_cb parameter as a zero.

NOTE: Any callbacks registered with this function will be overwritten if add_event_listener() API is used.

Parameters

status_cb The callback for status changes.

Reimplemented from NetworkInterface.

◆ get_connection_status()

nsapi_connection_status_t get_connection_status ( ) const

overridevirtual

Get the connection status.

Returns: The connection status (

See also: nsapi_types.h).

Reimplemented from NetworkInterface.

◆ set_blocking()

nsapi_error_t set_blocking ( bool blocking )

overridevirtual

Set asynchronous operation of connect() and disconnect() calls.

By default, interfaces are in synchronous mode which means that connect() or disconnect() blocks until it reach the target state or requested operation fails.

Parameters

blocking Use false to set NetworkInterface in asynchronous mode.

Returns: NSAPI_ERROR_OK on success; NSAPI_ERROR_UNSUPPORTED if driver does not support asynchronous mode.; negative error code on failure.

Reimplemented from NetworkInterface.

◆ get_emac()

EMAC & get_emac ( ) const

Provide access to the EMAC.

This should be used with care - normally the network stack would control the EMAC, so manipulating the EMAC while the stack is also using it (ie after connect) will likely cause problems.

Returns: Reference to the EMAC in use

Definition at line 136 of file EMACInterface.h.

◆ emacInterface()

EMACInterface * emacInterface ( )

finalvirtual

Return pointer to an EMACInterface.

Returns: Pointer to requested interface type or NULL if this class doesn't implement the interface.

Reimplemented from NetworkInterface.

Definition at line 141 of file EMACInterface.h.

◆ get_stack()

NetworkStack * get_stack ( )

finalprotected

Provide access to the underlying stack.

Returns: The underlying network stack

◆ get_default_instance()

static NetworkInterface * get_default_instance ( )

staticinherited

Return the default network interface.

Returns the default network interface, as determined by JSON option target.network-default-interface-type or other overrides.

The type of the interface returned can be tested by calling ethInterface(), wifiInterface(), meshInterface(), cellularInterface(), emacInterface() and checking for NULL pointers.

The default behavior is to return the default interface for the interface type specified by target.network-default-interface-type. Targets should set this in their targets.json to guide default selection, and applications may override.

The interface returned should be already configured for use such that its connect() method works with no parameters. For connection types needing configuration, settings should normally be obtained from JSON - the settings for the core types are under the "nsapi" JSON config tree.

The list of possible settings for default interface type is open-ended, as is the number of possible providers. Core providers are:

ETHERNET: EthernetInterface, using default EMAC and OnboardNetworkStack
MESH: ThreadInterface or LoWPANNDInterface, using default NanostackRfPhy
CELLULAR: OnboardModemInterface
WIFI: None - always provided by a specific class

Specific drivers may be activated by other settings of the default-network-interface-type configuration. This will depend on the target and the driver. For example a board may have its default setting as "AUTO" which causes it to autodetect an Ethernet cable. This should be described in the target's documentation.

An application can override all target settings by implementing NetworkInterface::get_default_instance() themselves - the default definition is weak, and calls get_target_default_instance().

◆ gethostbyname()

virtual nsapi_error_t gethostbyname	(	const char *	host,
		SocketAddress *	address,
		nsapi_version_t	version = `NSAPI_UNSPEC`,
		const char *	interface_name = `NULL`
	)

virtualinherited

Translate a hostname to an IP address with specific version using network interface name.

The hostname may be either a domain name or an IP address. If the hostname is an IP address, no network transactions will be performed.

If no stack-specific DNS resolution is provided, the hostname will be resolve using a UDP socket on the stack.

Parameters

host	Hostname to resolve.
address	Pointer to a SocketAddress to store the result.
version	IP version of address to resolve, NSAPI_UNSPEC indicates version is chosen by the stack (defaults to NSAPI_UNSPEC).
interface_name	Network interface name

Return values

NSAPI_ERROR_OK	on success
int	Negative error code on failure. See NetworkStack::gethostbyname

Implements DNS.

◆ getaddrinfo()

virtual nsapi_value_or_error_t getaddrinfo	(	const char *	hostname,
		SocketAddress *	hints,
		SocketAddress **	res,
		const char *	interface_name = `NULL`
	)

virtualinherited

Translate a hostname to the multiple IP addresses with specific version using network interface name.

The hostname may be either a domain name or an IP address. If the hostname is an IP address, no network transactions will be performed.

If no stack-specific DNS resolution is provided, the hostname will be resolve using a UDP socket on the stack.

Parameters

hostname	Hostname to resolve.
hints	Pointer to a SocketAddress with query parameters.
res	Pointer to a SocketAddress array to store the result..
interface_name	Network interface name

Returns: number of results on success, negative error code on failure.

Implements DNS.

◆ gethostbyname_async()

virtual nsapi_value_or_error_t gethostbyname_async	(	const char *	host,
		hostbyname_cb_t	callback,
		nsapi_version_t	version = `NSAPI_UNSPEC`,
		const char *	interface_name = `NULL`
	)

virtualinherited

Translate a hostname to an IP address (asynchronous) using network interface name.

The hostname may be either a domain name or a dotted IP address. If the hostname is an IP address, no network transactions will be performed.

If no stack-specific DNS resolution is provided, the hostname will be resolve using a UDP socket on the stack.

Call is non-blocking. Result of the DNS operation is returned by the callback. If this function returns failure, callback will not be called. In case result is success (IP address was found from DNS cache), callback will be called before function returns.

Parameters

host	Hostname to resolve.
callback	Callback that is called for result.
version	IP version of address to resolve, NSAPI_UNSPEC indicates version is chosen by the stack (defaults to NSAPI_UNSPEC).
interface_name	Network interface name

Returns: 0 on immediate success, negative error code on immediate failure or a positive unique id that represents the hostname translation operation and can be passed to cancel.

Implements DNS.

◆ getaddrinfo_async()

virtual nsapi_value_or_error_t getaddrinfo_async	(	const char *	hostname,
		SocketAddress *	hints,
		hostbyname_cb_t	callback,
		const char *	interface_name = `NULL`
	)

virtualinherited

Translate a hostname to the multiple IP addresses (asynchronous) using network interface name.

The hostname may be either a domain name or a dotted IP address. If the hostname is an IP address, no network transactions will be performed.

If no stack-specific DNS resolution is provided, the hostname will be resolve using a UDP socket on the stack.

Call is non-blocking. Result of the DNS operation is returned by the callback. If this function returns failure, callback will not be called. In case result is success (IP address was found from DNS cache), callback will be called before function returns.

Parameters

hostname	Hostname to resolve.
hints	Pointer to a SocketAddress with query parameters.
callback	Callback that is called for result.
interface_name	Network interface name

Returns: 0 on immediate success, negative error code on immediate failure or a positive unique id that represents the hostname translation operation and can be passed to cancel.

Implements DNS.

◆ gethostbyname_async_cancel()

virtual nsapi_error_t gethostbyname_async_cancel ( int id )

virtualinherited

Cancel asynchronous hostname translation.

When translation is cancelled, callback will not be called.

Parameters

id	Unique id of the hostname translation operation (returned by gethostbyname_async)

Returns: NSAPI_ERROR_OK on success, negative error code on failure.

Implements DNS.

◆ add_dns_server()

virtual nsapi_error_t add_dns_server	(	const SocketAddress &	address,
		const char *	interface_name
	)

virtualinherited

Add a domain name server to list of servers to query.

Parameters

address	Address for the dns host.
interface_name	Network interface name. Currently unused, the server is added for all interfaces.

Returns: NSAPI_ERROR_OK on success, negative error code on failure.

Implements DNS.

◆ get_dns_server()

virtual nsapi_error_t get_dns_server	(	int	index,
		SocketAddress *	address,
		const char *	interface_name = `NULL`
	)

virtualinherited

Get a domain name server from a list of servers to query.

Returns a DNS server address for a index. If returns error no more DNS servers to read.

Parameters

index	Index of the DNS server, starts from zero
address	Destination for the host address
interface_name	Network interface name

Returns: NSAPI_ERROR_OK on success, negative error code on failure

◆ add_event_listener()

void add_event_listener ( mbed::Callback< void(nsapi_event_t, intptr_t)> status_cb )

inherited

Add event listener for interface.

This API allows multiple callback to be registered for a single interface. When first called, internal list of event handlers are created and registered to interface through attach() API.

Application may only use attach() or add_event_listener() interface. Mixing usage of both leads to undefined behavior.

Warning: This version of the function does not use the std::nothrow feature. Subsequently, the function may fail to allocate memory and cause a system error. To use the new version with the changes, set "nsapi.add-event-listener-return-change": 1 in the target overrides section in your mbed_app.json file.

Parameters

status_cb The callback for status changes.

◆ ethInterface()

virtual EthInterface * ethInterface ( )

virtualinherited

Return pointer to an EthInterface.

Returns: Pointer to requested interface type or NULL if this class doesn't implement the interface.

Reimplemented in EthInterface.

Definition at line 463 of file NetworkInterface.h.

◆ wifiInterface()

virtual WiFiInterface * wifiInterface ( )

virtualinherited

Return pointer to a WiFiInterface.

Returns: Pointer to requested interface type or NULL if this class doesn't implement the interface.

Reimplemented in WiFiInterface.

Definition at line 471 of file NetworkInterface.h.

◆ meshInterface()

virtual MeshInterface * meshInterface ( )

virtualinherited

Return pointer to a MeshInterface.

Returns: Pointer to requested interface type or NULL if this class doesn't implement the interface.

Reimplemented in MeshInterface.

Definition at line 479 of file NetworkInterface.h.

◆ cellularInterface()

virtual CellularInterface * cellularInterface ( )

virtualinherited

Return pointer to a CellularInterface.

Returns: Pointer to requested interface type or NULL if this class doesn't implement the interface.

Reimplemented in CellularInterface.

Definition at line 495 of file NetworkInterface.h.

◆ set_default_parameters()

virtual void set_default_parameters ( )

virtualinherited

defined(DOXYGEN_ONLY)

Set default parameters on an interface.

A network interface instantiated directly or using calls such as WiFiInterface::get_default_instance() is initially unconfigured. This call can be used to set the default parameters that would have been set if the interface had been requested using NetworkInterface::get_default_instance() (see nsapi JSON configuration).

Reimplemented in CellularInterface, and WiFiInterface.

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Detailed Description

Member Typedef Documentation

◆ hostbyname_cb_t

Constructor & Destructor Documentation

◆ EMACInterface()

Member Function Documentation

◆ set_network()

◆ set_dhcp()

◆ connect()

◆ disconnect()

◆ get_hostname()

◆ set_hostname()

◆ get_mac_address()

◆ set_mac_address()

◆ get_ip_address()

◆ get_ipv6_link_local_address()

◆ get_netmask()

◆ get_gateway()

◆ get_interface_name()

◆ set_as_default()

◆ attach()

◆ get_connection_status()

◆ set_blocking()

◆ get_emac()

◆ emacInterface()

◆ get_stack()

◆ get_default_instance()

◆ gethostbyname()

◆ getaddrinfo()

◆ gethostbyname_async()

◆ getaddrinfo_async()

◆ gethostbyname_async_cancel()

◆ add_dns_server()

◆ get_dns_server()

◆ add_event_listener()

◆ ethInterface()

◆ wifiInterface()

◆ meshInterface()

◆ cellularInterface()

◆ set_default_parameters()