CoAP#
The Wi-SUN CoAP component provides an application layer implementation on top of the Wi-SUN stack and its socket API. The CoAP protocol is designed as a specialized Internet Application Protocol for constrained devices in lossy networks (see RFC 7252 for additional information). Wi-SUN FAN networks fit this definition. The CoAP implementation relies on the UDP transport layer to send and receive packets.
A number of helper functions are part of the component to help build CoAP payloads, parse CoAP packets, free CoAP packets, and more.
The CoAP Resource Handler service handles registered resources. Resource Discovery request provides an interface to get information about available resources. Resource has more attributes over URI (Uniform Resource Identifier) path, which can be filtered by particular Resource Discovery request.
The CoAP Notification service provides an interface to create and schedule notifications to the remote host. Schedule time and send condition can be customized depending on the application.
To use the CoAP component in your application, add it to your project and initialize it with sl_wisun_coap_init().
The Wi-SUN CoAP component offers an application layer implementation built on top of the Wi-SUN stack and its socket API. The CoAP protocol is specifically designed as an Internet Application Protocol for constrained devices operating in lossy networks (as defined in RFC 7252). Wi-SUN FAN networks precisely fit this definition.
The CoAP implementation relies on the UDP transport layer for sending and receiving packets. Within the component, you'll find a set of helper functions that assist in building CoAP payloads, parsing CoAP packets, and freeing CoAP packets. Additionally, the CoAP Resource Handler service manages registered resources.
For resource discovery, the Resource Discovery request provides an interface to retrieve information about available resources. These resources have additional attributes beyond the URI (Uniform Resource Identifier) path, which can be selectively filtered using specific Resource Discovery requests.
Furthermore, the CoAP Notification service allows you to create and schedule notifications for the remote host. You can customize the schedule time and send conditions based on your application requirements. To incorporate the CoAP component into your application, simply add it to your project and initialize it using sl_wisun_coap_init().
Modules#
Functions#
Build generic response for request wrapper function.
CoAP message builder Wi-SUN.
CoAP packet calc size wrapper.
Destroy packet.
Destroy payload string.
Destroy URI path string.
Free Wi-SUN CoAP.
Get the library handler pointer from the internal handler structure.
Prepare payload string.
Prepare URI path string.
Initialize Wi-SUN CoAP.
Initialize Wi-SUN CoAP default.
Implement malloc.
CoAP parser wrapper function.
Print CoAP packets and all of attached buffer, payload, token, uri_path.
Macros#
CoAP Service loop.
Function Documentation#
sl_wisun_coap_build_response#
sl_wisun_coap_packet_t * sl_wisun_coap_build_response (const sl_wisun_coap_packet_t * req, sl_wisun_coap_message_code_t msg_code)
Build generic response for request wrapper function.
| [in] | req | request |
| [in] | msg_code | message code to build |
Used sn_coap_build_response. Returns
sl_wisun_coap_header_t* built packet ptr on the heap
237 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_builder#
int16_t sl_wisun_coap_builder (uint8_t * dest_buff, const sl_wisun_coap_packet_t * message)
CoAP message builder Wi-SUN.
| [out] | dest_buff | destination buffer for raw message |
| [in] | message | message structure |
Used sl_wisun_coap_builder. Returns
int16_t On success bytes of built message, on failure -1 if CoAP header structure is wrong -2 if NULL ptr set as argument
227 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_builder_calc_size#
uint16_t sl_wisun_coap_builder_calc_size (const sl_wisun_coap_packet_t * message)
CoAP packet calc size wrapper.
| [in] | message | message ptr |
Used sn_coap_builder_calc_needed_packet_data_size. Returns
uint16_t size
216 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_destroy_packet#
void sl_wisun_coap_destroy_packet (sl_wisun_coap_packet_t * packet)
Destroy packet.
| N/A | packet | packet |
It must be used to avoid memory leaks! Free the all of allocated buffer for packet
280 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_destroy_payload_str#
__STATIC_INLINE void sl_wisun_coap_destroy_payload_str (char * str)
Destroy payload string.
| [in] | str | String |
'\0' terminated string in the heap, it must be freed
295 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_destroy_uri_path_str#
__STATIC_INLINE void sl_wisun_coap_destroy_uri_path_str (char * uri_str)
Destroy URI path string.
| [in] | uri_str | URI string ptr |
Call free on allocated pointer
262 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_free#
void sl_wisun_coap_free (void * addr)
Free Wi-SUN CoAP.
| N/A | addr | address ptr |
OS-dependent thread-safe implementation.
198 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_get_lib_handler#
const sl_wisun_coap_handle_t * sl_wisun_coap_get_lib_handler (void )
Get the library handler pointer from the internal handler structure.
| N/A |
Not thread safe! It is needed only to use Pelion mbed-coap library functions Returns
const sl_wisun_coap_handle_t* pointer to the lib handler
272 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_get_payload_str#
char * sl_wisun_coap_get_payload_str (const sl_wisun_coap_packet_t *const packet)
Prepare payload string.
| [in] | packet | Packet |
'\0' terminated string in the heap, it must be freed Returns
char* payload string, NULL on error
288 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_get_uri_path_str#
char * sl_wisun_coap_get_uri_path_str (const sl_wisun_coap_packet_t *const packet)
Prepare URI path string.
| [in] | packet | Packet |
'\0' terminated string in the heap, it must be freed Returns
char* URI path string, NULL on error
255 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_init#
void sl_wisun_coap_init (const sl_wisun_coap_tx_callback tx_callback, const sl_wisun_coap_rx_callback rx_callback, const sl_wisun_coap_version_t version)
Initialize Wi-SUN CoAP.
| [in] | tx_callback | TX callback, if it's NULL, the default callback is applied |
| [in] | rx_callback | RX callback, if it's NULL, the default callback is applied |
| [in] | version | CoAP version |
Set the Wi-SUN CoAP internal descriptor.
172 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_init_default#
__STATIC_INLINE void sl_wisun_coap_init_default (void )
Initialize Wi-SUN CoAP default.
| N/A |
Initializes the internal descriptor with default values.
180 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_malloc#
void * sl_wisun_coap_malloc (uint16_t size)
Implement malloc.
| N/A | size | size for malloc |
OS-dependent thread-safe implementation. Returns
void* the memory pointer
191 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_parser#
sl_wisun_coap_packet_t * sl_wisun_coap_parser (uint16_t packet_data_len, uint8_t * packet_data)
CoAP parser wrapper function.
| [in] | packet_data_len | packet data size |
| [in] | packet_data | packet data ptr |
Used sn_coap_parser Returns
sl_wisun_coap_packet_t* Parsed packet pointer
207 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.hsl_wisun_coap_print_packet#
void sl_wisun_coap_print_packet (const sl_wisun_coap_packet_t * packet, const bool hex_format)
Print CoAP packets and all of attached buffer, payload, token, uri_path.
| [in] | packet | packet to print |
| [in] | hex_format | hex format bool to decide buffer print format |
Pretty printer function, with hex format option for buffers
246 of file /mnt/raid/workspaces/ws.wIWINzxl8/overlay/gsdk/app/wisun/component/coap/sl_wisun_coap.h