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

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 284 of file NetworkInterface.h.

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

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

Parameters

address

Address for the dns host.

Returns

NSAPI_ERROR_OK on success, negative error code on failure.

Implements DNS.

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.

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.

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 475 of file NetworkInterface.h.

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 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.

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 132 of file EMACInterface.h.

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 443 of file NetworkInterface.h.

Get the connection status.

Returns

The connection status (

See also

nsapi_types.h).

Reimplemented from NetworkInterface.

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().

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

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 127 of file EMACInterface.h.

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 the network interface name.

Returns

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

Reimplemented from NetworkInterface.

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 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 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.

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.

Provide access to the underlying stack.

Returns

The underlying network stack

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.

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.

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.

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.

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.

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 459 of file NetworkInterface.h.

Set network interface as default one.

Reimplemented from NetworkInterface.

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.

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 WiFiInterface, and CellularInterface.

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.

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.

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.

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 451 of file NetworkInterface.h.