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Public Types | Public Member Functions | Static Public Member Functions
NetworkInterface Class Referenceabstract

Common interface that is shared between network devices. More...

#include <NetworkInterface.h>

Inheritance diagram for NetworkInterface:
DNS CellularInterface EMACInterface EthInterface InterfaceNanostack L3IPInterface MeshInterface WiFiInterface CellularContext EthernetInterface RDAWiFiInterface EthernetInterface NanostackEthernetInterface MeshInterfaceNanostack NanostackEthernetInterface MeshInterfaceNanostack RDAWiFiInterface

Public Types

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

Public Member Functions

virtual void set_as_default ()
 Set network interface as default one. More...
 
virtual const char * get_mac_address ()
 Get the local MAC address. More...
 
virtual const char * get_ip_address ()
 Get the local IP address. More...
 
virtual const char * get_netmask ()
 Get the local network mask. More...
 
virtual const char * get_gateway ()
 Get the local gateway. More...
 
virtual char * get_interface_name (char *interface_name)
 Get the network interface name. More...
 
virtual nsapi_error_t set_network (const char *ip_address, const char *netmask, const char *gateway)
 Configure this network interface to use a static IP address. More...
 
virtual nsapi_error_t set_dhcp (bool dhcp)
 Enable or disable DHCP on connecting the network. More...
 
virtual nsapi_error_t connect ()=0
 Connect to a network. More...
 
virtual nsapi_error_t disconnect ()=0
 Disconnect from the network. 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 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_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 void attach (mbed::Callback< void(nsapi_event_t, intptr_t)> status_cb)
 Register callback for status reporting. More...
 
void add_event_listener (mbed::Callback< void(nsapi_event_t, intptr_t)> status_cb)
 Add event listener for interface. More...
 
void remove_event_listener (mbed::Callback< void(nsapi_event_t, intptr_t)> status_cb)
 Remove event listener from interface. More...
 
virtual nsapi_connection_status_t get_connection_status () const
 Get the connection status. More...
 
virtual nsapi_error_t set_blocking (bool blocking)
 Set asynchronous operation of connect() and disconnect() calls. More...
 
virtual EthInterfaceethInterface ()
 Return pointer to an EthInterface. More...
 
virtual WiFiInterfacewifiInterface ()
 Return pointer to a WiFiInterface. More...
 
virtual MeshInterfacemeshInterface ()
 Return pointer to a MeshInterface. More...
 
virtual CellularInterfacecellularBase ()
 Return pointer to a CellularInterface. More...
 
virtual EMACInterfaceemacInterface ()
 Return pointer to an EMACInterface. More...
 
virtual void set_default_parameters ()
 defined(DOXYGEN_ONLY) More...
 
virtual CellularInterfacecellularInterface ()
 Return pointer to a CellularInterface. More...
 

Static Public Member Functions

static NetworkInterfaceget_default_instance ()
 Return the default network interface. More...
 

Detailed Description

Common interface that is shared between network devices.

Definition at line 43 of file NetworkInterface.h.

Member Typedef Documentation

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

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.
Parameters
resultNSAPI_ERROR_OK on success, negative error code on failure.
addressOn success, destination for the host SocketAddress.

Definition at line 218 of file NetworkInterface.h.

Member Function Documentation

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

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

Parameters
addressAddress for the dns host.
Returns
NSAPI_ERROR_OK on success, negative error code on failure.

Implements DNS.

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

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.

Parameters
status_cbThe callback for status changes.
virtual void attach ( mbed::Callback< void(nsapi_event_t, intptr_t)>  status_cb)
virtual

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_cbThe callback for status changes.

Reimplemented in CellularContext, EMACInterface, L3IPInterface, InterfaceNanostack, and AT_CellularContext.

virtual CellularInterface* cellularBase ( )
virtual

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 345 of file NetworkInterface.h.

virtual CellularInterface* cellularInterface ( )
virtual

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 422 of file NetworkInterface.h.

virtual nsapi_error_t connect ( )
pure virtual

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.

Implemented in CellularContext, RDAWiFiInterface, InterfaceNanostack, WiFiInterface, CellularInterface, EMACInterface, L3IPInterface, and AT_CellularContext.

virtual nsapi_error_t disconnect ( )
pure virtual

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.

Implemented in CellularContext, RDAWiFiInterface, InterfaceNanostack, WiFiInterface, CellularInterface, EMACInterface, L3IPInterface, and AT_CellularContext.

virtual EMACInterface* emacInterface ( )
virtual

Return pointer to an EMACInterface.

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

Reimplemented in EMACInterface.

Definition at line 353 of file NetworkInterface.h.

virtual EthInterface* ethInterface ( )
virtual

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 320 of file NetworkInterface.h.

virtual nsapi_connection_status_t get_connection_status ( ) const
virtual

Get the connection status.

Returns
The connection status (
See also
nsapi_types.h).

Reimplemented in EMACInterface, L3IPInterface, InterfaceNanostack, and AT_CellularContext.

static NetworkInterface* get_default_instance ( )
static

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(), cellularBase(), 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:

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().

virtual const char* get_gateway ( )
virtual

Get the local gateway.

Returns
Null-terminated representation of the local gateway or null if no network mask has been received.

Reimplemented in CellularContext, EMACInterface, CellularInterface, L3IPInterface, and AT_CellularContext.

virtual char* get_interface_name ( char *  interface_name)
virtual

Get the network interface name.

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

Reimplemented in EMACInterface, and L3IPInterface.

virtual const char* get_ip_address ( )
virtual

Get the local IP address.

Returns
Null-terminated representation of the local IP address or null if not yet connected

Reimplemented in CellularContext, EMACInterface, CellularInterface, InterfaceNanostack, L3IPInterface, and AT_CellularContext.

virtual const char* get_mac_address ( )
virtual

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 in InterfaceNanostack, and EMACInterface.

virtual const char* get_netmask ( )
virtual

Get the local network mask.

Returns
Null-terminated representation of the local network mask or null if no network mask has been received.

Reimplemented in CellularContext, EMACInterface, CellularInterface, L3IPInterface, and AT_CellularContext.

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

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
hostHostname to resolve.
addressPointer to a SocketAddress to store the result.
versionIP version of address to resolve, NSAPI_UNSPEC indicates version is chosen by the stack (defaults to NSAPI_UNSPEC).
interface_nameNetwork interface name
Returns
NSAPI_ERROR_OK on success, negative error code on failure.

Implements DNS.

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 
)
virtual

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
hostHostname to resolve.
callbackCallback that is called for result.
versionIP version of address to resolve, NSAPI_UNSPEC indicates version is chosen by the stack (defaults to NSAPI_UNSPEC).
interface_nameNetwork 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.

virtual nsapi_error_t gethostbyname_async_cancel ( int  id)
virtual

Cancel asynchronous hostname translation.

When translation is cancelled, callback will not be called.

Parameters
idUnique id of the hostname translation operation (returned by gethostbyname_async)
Returns
NSAPI_ERROR_OK on success, negative error code on failure.

Implements DNS.

virtual MeshInterface* meshInterface ( )
virtual

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 336 of file NetworkInterface.h.

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

Remove event listener from interface.

Remove previously added callback from the handler list.

Parameters
status_cbThe callback to unregister.
virtual void set_as_default ( )
virtual

Set network interface as default one.

Reimplemented in EMACInterface, and L3IPInterface.

virtual nsapi_error_t set_blocking ( bool  blocking)
virtual

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
blockingUse true 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 in EMACInterface, L3IPInterface, InterfaceNanostack, CellularContext, and AT_CellularContext.

virtual void set_default_parameters ( )
virtual

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.

virtual nsapi_error_t set_dhcp ( bool  dhcp)
virtual

Enable or disable DHCP on connecting the network.

Enabled by default unless a static IP address has been assigned. Requires that the network is disconnected.

Parameters
dhcpTrue to enable DHCP.
Returns
NSAPI_ERROR_OK on success, negative error code on failure.

Reimplemented in EMACInterface, and L3IPInterface.

virtual nsapi_error_t set_network ( const char *  ip_address,
const char *  netmask,
const char *  gateway 
)
virtual

Configure 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_addressNull-terminated representation of the local IP address
netmaskNull-terminated representation of the local network mask
gatewayNull-terminated representation of the local gateway
Returns
NSAPI_ERROR_OK on success, negative error code on failure

Reimplemented in EMACInterface, and L3IPInterface.

virtual WiFiInterface* wifiInterface ( )
virtual

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 328 of file NetworkInterface.h.

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