ESP32Stack class Implementation of the NetworkStack for the ESP32. More...

#include <ESP32Stack.h>

Inheritance diagram for ESP32Stack:

Public Types
typedef mbed::Callback< nsapi_error_t(int delay_ms, mbed::Callback< void()> user_cb)>	call_in_callback_cb_t
	Type for a call-in callback.

Public Member Functions
virtual nsapi_error_t	get_ip_address (SocketAddress *address)
	Get the local IP address.

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

virtual nsapi_error_t	get_ip_address_if (SocketAddress address, const char interface_name)
	Get the local IP address on interface name.

virtual nsapi_error_t	gethostbyname (const char host, SocketAddress address, nsapi_version_t version=NSAPI_UNSPEC, const char *interface_name=NULL)
	Translates a hostname to an IP address with specific version.

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.

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)
	Translates a hostname to multiple IP addresses (asynchronous)

virtual nsapi_value_or_error_t	getaddrinfo_async (const char hostname, SocketAddress hints, hostbyname_cb_t callback, const char *interface_name=NULL)
	Translates a hostname to the multiple IP addresses (asynchronous)

virtual nsapi_error_t	gethostbyname_async_cancel (int id)
	Cancels asynchronous hostname translation.

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

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.

virtual OnboardNetworkStack *	onboardNetworkStack ()
	Dynamic downcast to a OnboardNetworkStack.

Protected Member Functions
	ESP32Stack (PinName en, PinName io0, PinName tx, PinName rx, bool debug, PinName rts, PinName cts, int baudrate, int is_ap)
	ESP32Stack lifetime.

int	socket_open (void **handle, nsapi_protocol_t proto) override
	Opens a socket.

int	socket_close (void *handle) override
	Close the socket.

int	socket_bind (void *handle, const SocketAddress &address) override
	Bind a specific address to a socket.

int	socket_listen (void *handle, int backlog) override
	Listen for connections on a TCP socket.

int	socket_connect (void *handle, const SocketAddress &address) override
	Connects TCP socket to a remote host.

int	socket_accept (void handle, void socket, SocketAddress address) override
	Accepts a connection on a TCP socket.

void	socket_attach (void handle, void(callback)(void ), void data) override
	Register a callback on state change of the socket.

nsapi_error_t	setsockopt (nsapi_socket_t handle, int level, int optname, const void *optval, unsigned optlen) override
	Set stack-specific socket options.

nsapi_error_t	getsockopt (nsapi_socket_t handle, int level, int optname, void optval, unsigned optlen) override
	Get stack-specific socket options.

virtual nsapi_size_or_error_t	socket_send (nsapi_socket_t handle, const void *data, nsapi_size_t size)=0
	Send data over a TCP socket.

virtual nsapi_size_or_error_t	socket_recv (nsapi_socket_t handle, void *data, nsapi_size_t size)=0
	Receive data over a TCP socket.

virtual nsapi_size_or_error_t	socket_sendto (nsapi_socket_t handle, const SocketAddress &address, const void *data, nsapi_size_t size)=0
	Send a packet over a UDP socket.

virtual nsapi_size_or_error_t	socket_recvfrom (nsapi_socket_t handle, SocketAddress address, void buffer, nsapi_size_t size)=0
	Receive a packet over a UDP socket.

virtual nsapi_size_or_error_t	socket_sendto_control (nsapi_socket_t handle, const SocketAddress &address, const void data, nsapi_size_t size, nsapi_msghdr_t control, nsapi_size_t control_size)
	Send a packet with ancillary data over a UDP socket.

virtual nsapi_size_or_error_t	socket_recvfrom_control (nsapi_socket_t handle, SocketAddress address, void data, nsapi_size_t size, nsapi_msghdr_t *control, nsapi_size_t control_size)
	Receive a packet with ancillary data over a UDP socket.

Detailed Description

ESP32Stack class Implementation of the NetworkStack for the ESP32.

Definition at line 31 of file ESP32Stack.h.

Member Typedef Documentation

◆ call_in_callback_cb_t

typedef mbed::Callback<nsapi_error_t (int delay_ms, mbed::Callback<void()> user_cb)> call_in_callback_cb_t

inherited

Type for a call-in callback.

This is a pointer to a function that will call the provided callback from the network stack after a given delay, or immediately if delay_ms is 0.

Definition at line 235 of file NetworkStack.h.

Constructor & Destructor Documentation

◆ ESP32Stack()

ESP32Stack	(	PinName	en,
		PinName	io0,
		PinName	tx,
		PinName	rx,
		bool	debug,
		PinName	rts,
		PinName	cts,
		int	baudrate,
		int	is_ap
	)

protected

ESP32Stack lifetime.

Parameters

en	EN pin
io0	IO0 pin
tx	TX pin
rx	RX pin
debug	Enable debugging
rts	RTS pin
cts	CTS pin
baudrate	The baudrate of the serial port.
is_ap	0:Terminal 1:Access point.

Member Function Documentation

◆ socket_open()

int socket_open	(	void **	handle,
		nsapi_protocol_t	proto
	)

overrideprotectedvirtual

Opens a socket.

Creates a network socket and stores it in the specified handle. The handle must be passed to following calls on the socket.

A stack may have a finite number of sockets, in this case NSAPI_ERROR_NO_SOCKET is returned if no socket is available.

Parameters

handle	Destination for the handle to a newly created socket
proto	Protocol of socket to open, NSAPI_TCP or NSAPI_UDP

Returns: NSAPI_ERROR_OK on success, negative error code on failure

Implements NetworkStack.

◆ socket_close()

int socket_close ( void * handle )

overrideprotectedvirtual

Close the socket.

Closes any open connection and deallocates any memory associated with the socket.

Parameters

handle Socket handle

Returns: NSAPI_ERROR_OK on success, negative error code on failure

Implements NetworkStack.

◆ socket_bind()

int socket_bind	(	void *	handle,
		const SocketAddress &	address
	)

overrideprotectedvirtual

Bind a specific address to a socket.

Binding a socket specifies the address and port on which to receive data. If the IP address is zeroed, only the port is bound.

Parameters

handle	Socket handle
address	Local address to bind

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

Implements NetworkStack.

◆ socket_listen()

int socket_listen	(	void *	handle,
		int	backlog
	)

overrideprotectedvirtual

Listen for connections on a TCP socket.

Marks the socket as a passive socket that can be used to accept incoming connections.

Parameters

handle	Socket handle
backlog	Number of pending connections that can be queued simultaneously

Returns: NSAPI_ERROR_OK on success, negative error code on failure

Implements NetworkStack.

◆ socket_connect()

int socket_connect	(	void *	handle,
		const SocketAddress &	address
	)

overrideprotectedvirtual

Connects TCP socket to a remote host.

Initiates a connection to a remote server specified by the indicated address.

Parameters

handle	Socket handle
address	The SocketAddress of the remote host

Returns: NSAPI_ERROR_OK on success, negative error code on failure

Implements NetworkStack.

◆ socket_accept()

int socket_accept	(	void *	server,
		void **	handle,
		SocketAddress *	address
	)

overrideprotectedvirtual

Accepts a connection on a TCP socket.

The server socket must be bound and set to listen for connections. On a new connection, creates a network socket and stores it in the specified handle. The handle must be passed to following calls on the socket.

A stack may have a finite number of sockets, in this case NSAPI_ERROR_NO_SOCKET is returned if no socket is available.

This call is non-blocking. If accept would block, NSAPI_ERROR_WOULD_BLOCK is returned immediately.

Parameters

server	Socket handle to server to accept from
handle	Destination for a handle to the newly created socket
address	Destination for the remote address or NULL

Returns: NSAPI_ERROR_OK on success, negative error code on failure

Implements NetworkStack.

◆ socket_attach()

void socket_attach	(	void *	handle,
		void()(void )	callback,
		void *	data
	)

overrideprotectedvirtual

Register a callback on state change of the socket.

The specified callback will be called on state changes such as when the socket can recv/send/accept successfully and on when an error occurs. The callback may also be called spuriously without reason.

The callback may be called in an interrupt context and should not perform expensive operations such as recv/send calls.

Parameters

handle	Socket handle
callback	Function to call on state change
data	Argument to pass to callback

Implements NetworkStack.

◆ setsockopt()

nsapi_error_t setsockopt	(	nsapi_socket_t	handle,
		int	level,
		int	optname,
		const void *	optval,
		unsigned	optlen
	)

overrideprotectedvirtual

Set stack-specific socket options.

The setsockopt allow an application to pass stack-specific hints to the underlying stack. For unsupported options, NSAPI_ERROR_UNSUPPORTED is returned and the socket is unmodified.

Parameters

handle	Socket handle.
level	Stack-specific protocol level.
optname	Stack-specific option identifier.
optval	Option value.
optlen	Length of the option value.

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

Reimplemented from NetworkStack.

◆ getsockopt()

nsapi_error_t getsockopt	(	nsapi_socket_t	handle,
		int	level,
		int	optname,
		void *	optval,
		unsigned *	optlen
	)

overrideprotectedvirtual

Get stack-specific socket options.

The getstackopt allow an application to retrieve stack-specific hints from the underlying stack. For unsupported options, NSAPI_ERROR_UNSUPPORTED is returned and optval is unmodified.

Parameters

handle	Socket handle.
level	Stack-specific protocol level.
optname	Stack-specific option identifier.
optval	Destination for option value.
optlen	Length of the option value.

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

Reimplemented from NetworkStack.

◆ get_ip_address()

virtual nsapi_error_t get_ip_address ( SocketAddress * address )

virtualinherited

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 AT_CellularStack, ESP32InterfaceAP, Nanostack, and ESP32Interface.

◆ get_ipv6_link_local_address()

virtual nsapi_error_t get_ipv6_link_local_address ( SocketAddress * address )

virtualinherited

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

◆ get_ip_address_if()

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

virtualinherited

Get the local IP address on interface name.

Parameters

address	SocketAddress representation of the link local IPv6 address
interface_name	Network interface_name

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

◆ gethostbyname()

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

virtualinherited

Translates a hostname to an IP address with specific version.

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
NSAPI_ERROR_PARAMETER	if invalid (null) name is provided
NSAPI_ERROR_DNS_FAILURE	if DNS resolution fails
int	other negative errors, see nsapi_dns_query

Implements DNS.

Reimplemented in Nanostack, RM1000_AT_CellularStack, ESP32Interface, and ESP32InterfaceAP.

◆ 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

Translates a hostname to multiple IP addresses (asynchronous)

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.

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.

Reimplemented in Nanostack.

◆ 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

Translates a hostname to the multiple IP addresses (asynchronous)

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.

The 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 that IP addresses are 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

Cancels asynchronous hostname translation.

When translation is cancelled, callback will not be called.

Parameters

id	Unique id of the hostname translation operation

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 = `NULL`
	)

virtualinherited

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

Parameters

address	Destination for the host address
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.

Reimplemented in ESP32Interface, and ESP32InterfaceAP.

◆ 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

Reimplemented in Nanostack.

◆ onboardNetworkStack()

virtual OnboardNetworkStack * onboardNetworkStack ( )

virtualinherited

Dynamic downcast to a OnboardNetworkStack.

Reimplemented in OnboardNetworkStack.

Definition at line 225 of file NetworkStack.h.

◆ socket_send()

virtual nsapi_size_or_error_t socket_send	(	nsapi_socket_t	handle,
		const void *	data,
		nsapi_size_t	size
	)

protectedpure virtualinherited

Send data over a TCP socket.

The socket must be connected to a remote host. Returns the number of bytes sent from the buffer.

This call is non-blocking. If send would block, NSAPI_ERROR_WOULD_BLOCK is returned immediately.

Parameters

handle	Socket handle
data	Buffer of data to send to the host
size	Size of the buffer in bytes

Returns: Number of sent bytes on success, negative error code on failure

Implemented in AT_CellularStack, and Nanostack.

◆ socket_recv()

virtual nsapi_size_or_error_t socket_recv	(	nsapi_socket_t	handle,
		void *	data,
		nsapi_size_t	size
	)

protectedpure virtualinherited

Receive data over a TCP socket.

The socket must be connected to a remote host. Returns the number of bytes received into the buffer.

This call is non-blocking. If recv would block, NSAPI_ERROR_WOULD_BLOCK is returned immediately.

Parameters

handle	Socket handle
data	Destination buffer for data received from the host
size	Size of the buffer in bytes

Returns: Number of received bytes on success, negative error code on failure

Implemented in AT_CellularStack, and Nanostack.

◆ socket_sendto()

virtual nsapi_size_or_error_t socket_sendto	(	nsapi_socket_t	handle,
		const SocketAddress &	address,
		const void *	data,
		nsapi_size_t	size
	)

protectedpure virtualinherited

Send a packet over a UDP socket.

Sends data to the specified address. Returns the number of bytes sent from the buffer.

This call is non-blocking. If sendto would block, NSAPI_ERROR_WOULD_BLOCK is returned immediately.

Parameters

handle	Socket handle
address	The SocketAddress of the remote host
data	Buffer of data to send to the host
size	Size of the buffer in bytes

Returns: Number of sent bytes on success, negative error code on failure

Implemented in AT_CellularStack, and Nanostack.

◆ socket_recvfrom()

virtual nsapi_size_or_error_t socket_recvfrom	(	nsapi_socket_t	handle,
		SocketAddress *	address,
		void *	buffer,
		nsapi_size_t	size
	)

protectedpure virtualinherited

Receive a packet over a UDP socket.

Receives data and stores the source address in address if address is not NULL. Returns the number of bytes received into the buffer.

This call is non-blocking. If recvfrom would block, NSAPI_ERROR_WOULD_BLOCK is returned immediately.

Parameters

handle	Socket handle
address	Destination for the source address or NULL
buffer	Destination buffer for data received from the host
size	Size of the buffer in bytes

Returns: Number of received bytes on success, negative error code on failure

Implemented in AT_CellularStack, and Nanostack.

◆ socket_sendto_control()

virtual nsapi_size_or_error_t socket_sendto_control	(	nsapi_socket_t	handle,
		const SocketAddress &	address,
		const void *	data,
		nsapi_size_t	size,
		nsapi_msghdr_t *	control,
		nsapi_size_t	control_size
	)

protectedvirtualinherited

Send a packet with ancillary data over a UDP socket.

Sends data to the specified address. Returns the number of bytes sent from the buffer.

This call is non-blocking. If sendto would block, NSAPI_ERROR_WOULD_BLOCK is returned immediately.

Parameters

handle	Socket handle
address	The SocketAddress of the remote host
data	Buffer of data to send to the host
size	Size of the buffer in bytes
control	Storage for ancillary data
control_size	Size of ancillary data

Returns: Number of sent bytes on success, negative error code on failure

Definition at line 408 of file NetworkStack.h.

◆ socket_recvfrom_control()

virtual nsapi_size_or_error_t socket_recvfrom_control	(	nsapi_socket_t	handle,
		SocketAddress *	address,
		void *	data,
		nsapi_size_t	size,
		nsapi_msghdr_t *	control,
		nsapi_size_t	control_size
	)

protectedvirtualinherited

Receive a packet with ancillary data over a UDP socket.

Receives data and stores the source address in address if address is not NULL. Returns the number of bytes received into the buffer.

Ancillary data is stored into control. The caller needs to allocate a buffer that is large enough to contain the data they want to receive, then pass the pointer in through the control member. The data will be filled into control, beginning with a header specifying what data was received. See MsgHeaderIterator for how to parse this data.

This call is non-blocking. If recvfrom would block, NSAPI_ERROR_WOULD_BLOCK is returned immediately.

Parameters

handle	Socket handle
address	Destination for the source address or NULL
data	Destination buffer for data received from the host
size	Size of the buffer in bytes
control	Storage for ancillary data
control_size	Size of ancillary data

Returns: Number of received bytes on success, negative error code on failure

Definition at line 441 of file NetworkStack.h.

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Typedef Documentation

◆ call_in_callback_cb_t

Constructor & Destructor Documentation

◆ ESP32Stack()

Member Function Documentation

◆ socket_open()

◆ socket_close()

◆ socket_bind()

◆ socket_listen()

◆ socket_connect()

◆ socket_accept()

◆ socket_attach()

◆ setsockopt()

◆ getsockopt()

◆ get_ip_address()

◆ get_ipv6_link_local_address()

◆ get_ip_address_if()

◆ gethostbyname()

◆ getaddrinfo()

◆ gethostbyname_async()

◆ getaddrinfo_async()

◆ gethostbyname_async_cancel()

◆ add_dns_server()

◆ get_dns_server()

◆ onboardNetworkStack()

◆ socket_send()

◆ socket_recv()

◆ socket_sendto()

◆ socket_recvfrom()

◆ socket_sendto_control()

◆ socket_recvfrom_control()