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.

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

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.

Attempt to connect to a Wi-Fi network.

Parameters

ssid	Name of the network to connect to.
pass	Security passphrase to connect to the network.
security	Type of encryption for connection (Default: NSAPI_SECURITY_NONE).
channel	Channel to make the connection, or 0 for any (Default: 0).

Returns

NSAPI_ERROR_OK on success, or error code on failure.

Implemented in RDAWiFiInterface, WhdSTAInterface, and SclSTAInterface.

Attempt to connect to a Wi-Fi network.

Requires ssid and passphrase to be set. If passphrase is invalid, NSAPI_ERROR_AUTH_ERROR is returned.

Returns

NSAPI_ERROR_OK on success, negative error code on failure.

Implements NetworkInterface.

Implemented in RDAWiFiInterface, WhdSTAInterface, and SclSTAInterface.

Stop the interface.

Returns

NSAPI_ERROR_OK on success, or error code on failure.

Implements NetworkInterface.

Implemented in RDAWiFiInterface, WhdSTAInterface, and SclSTAInterface.

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 467 of file NetworkInterface.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 in InterfaceNanostack, L3IPInterface, EMACInterface, PPPInterface, and AT_CellularContext.

Get the default Wi-Fi interface.

This is provided as a weak method so applications can override it. Default behavior is to get the target's default interface, if any.

Returns

pointer to interface, if any.

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

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 in EMACInterface, L3IPInterface, PPPInterface, and UBLOX_AT_CellularContext.

Get the network interface name.

Returns

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

Reimplemented in EMACInterface, L3IPInterface, PPPInterface, and AT_CellularContext.

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

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 in EMACInterface.

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.

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 in EMACInterface, L3IPInterface, and PPPInterface.

Get the current radio signal strength for active connection.

Returns

Connection strength in dBm (negative value), or 0 if measurement impossible.

Implemented in WhdSTAInterface, SclSTAInterface, and RDAWiFiInterface.

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.

Scan for available networks.

Note

This is a blocking function.

If the count is 0, the function only returns the number of available networks. If the count is greater than 0 and the res is not NULL, the array of discovered APs is populated with discovered networks up to the value of the count.

Parameters

res	Pointer to allocated array to store discovered APs.
count	Size of allocated res array, or 0 to only count available APs.

Returns

Number of entries in res, or if count was 0, number of available networks. Negative on error (

See also

nsapi_types.h for nsapi_error).

Implemented in RDAWiFiInterface.

Set network interface as default one.

Reimplemented in EMACInterface, L3IPInterface, and PPPInterface.

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 in WhdSoftAPInterface, CellularContext, InterfaceNanostack, WhdSTAInterface, L3IPInterface, SclSTAInterface, EMACInterface, PPPInterface, and AT_CellularContext.

Set the Wi-Fi network channel.

Parameters

channel

Channel to make the connection, or 0 for any (Default: 0).

Returns

NSAPI_ERROR_OK on success, or error code on failure.

Implemented in WhdSTAInterface, SclSTAInterface, and RDAWiFiInterface.

Set the Wi-Fi network credentials.

Parameters

ssid	Name of the network to connect to.
pass	Security passphrase to connect to the network.
security	Type of encryption for connection (defaults to NSAPI_SECURITY_NONE).

Returns

NSAPI_ERROR_OK on success, or error code on failure.

Implemented in WhdSTAInterface, SclSTAInterface, and RDAWiFiInterface.

defined(DOXYGEN_ONLY)

Set default parameters on a Wi-Fi interface.

A Wi-Fi interface instantiated directly or using 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 from NetworkInterface.

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

dhcp	True to enable DHCP.

Return values

NSAPI_ERROR_OK	on success.
NSAPI_ERROR_UNSUPPORTED	if operation is not supported.

Reimplemented in EMACInterface, and L3IPInterface.

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 in InterfaceNanostack, and EMACInterface.

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_address	SocketAddress object containing the local IP address
netmask	SocketAddress object containing the local network mask
gateway	SocketAddress object containing the local gateway

Return values

NSAPI_ERROR_OK	on success
NSAPI_ERROR_UNSUPPORTED	if this function is unsupported

Reimplemented in EMACInterface, L3IPInterface, and PPPInterface.

Return pointer to a WiFiInterface.

Returns

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

Reimplemented from NetworkInterface.

Definition at line 110 of file WiFiInterface.h.