sn_coap_protocol.h

00001 /*
00002  * Copyright (c) 2011-2015 ARM Limited. All rights reserved.
00003  * SPDX-License-Identifier: Apache-2.0
00004  * Licensed under the Apache License, Version 2.0 (the License); you may
00005  * not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  * http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an AS IS BASIS, WITHOUT
00012  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 /**
00018  * \file sn_coap_protocol.h
00019  *
00020  * \brief CoAP C-library User protocol interface header file
00021  */
00022 
00023 #ifdef __cplusplus
00024 extern "C" {
00025 #endif
00026 
00027 #ifndef SN_COAP_PROTOCOL_H_
00028 #define SN_COAP_PROTOCOL_H_
00029 
00030 #include "sn_coap_header.h"
00031 
00032 /**
00033  * \fn struct coap_s *sn_coap_protocol_init(void* (*used_malloc_func_ptr)(uint16_t), void (*used_free_func_ptr)(void*),
00034         uint8_t (*used_tx_callback_ptr)(sn_nsdl_capab_e , uint8_t *, uint16_t, sn_nsdl_addr_s *),
00035         int8_t (*used_rx_callback_ptr)(sn_coap_hdr_s *, sn_nsdl_addr_s *)
00036  *
00037  * \brief Initializes CoAP Protocol part. When using libNsdl, sn_nsdl_init() calls this function.
00038  *
00039  * \param *used_malloc_func_ptr is function pointer for used memory allocation function.
00040  *
00041  * \param *used_free_func_ptr is function pointer for used memory free function.
00042  *
00043  * \param *used_tx_callback_ptr function callback pointer to tx function for sending coap messages
00044  *
00045  * \param *used_rx_callback_ptr used to return CoAP header struct with status COAP_STATUS_BUILDER_MESSAGE_SENDING_FAILED
00046  *        when re-sendings exceeded. If set to NULL, no error message is returned.
00047  *
00048  * \return  Pointer to handle when success
00049  *          Null if failed
00050  */
00051 
00052 extern struct coap_s *sn_coap_protocol_init(void *(*used_malloc_func_ptr)(uint16_t), void (*used_free_func_ptr)(void *),
00053         uint8_t (*used_tx_callback_ptr)(uint8_t *, uint16_t, sn_nsdl_addr_s *, void *),
00054         int8_t (*used_rx_callback_ptr)(sn_coap_hdr_s *, sn_nsdl_addr_s *, void *));
00055 
00056 /**
00057  * \fn int8_t sn_coap_protocol_destroy(void)
00058  *
00059  * \brief Frees all memory from CoAP protocol part
00060  *
00061  * \param *handle Pointer to CoAP library handle
00062  *
00063  * \return Return value is always 0
00064  */
00065 extern int8_t sn_coap_protocol_destroy(struct coap_s *handle);
00066 
00067 /**
00068  * \fn int16_t sn_coap_protocol_build(struct coap_s *handle, sn_nsdl_addr_s *dst_addr_ptr, uint8_t *dst_packet_data_ptr, sn_coap_hdr_s *src_coap_msg_ptr, void *param)
00069  *
00070  * \brief Builds Packet data from given CoAP header structure to be sent
00071  *
00072  * \param *dst_addr_ptr is pointer to destination address where CoAP message
00073  *        will be sent (CoAP builder needs that information for message resending purposes)
00074  *
00075  * \param *dst_packet_data_ptr is pointer to destination of built Packet data
00076  *
00077  * \param *src_coap_msg_ptr is pointer to source of built Packet data
00078  *
00079  * \param param void pointer that will be passed to tx/rx function callback when those are called.
00080  *
00081  * \return Return value is byte count of built Packet data.\n
00082  *         Note: If message is blockwised, all payload is not sent at the same time\n
00083  *         In failure cases:\n
00084  *          -1 = Failure in CoAP header structure\n
00085  *          -2 = Failure in given pointer (= NULL)\n
00086  *          -3 = Failure in Reset message\n
00087  *          -4 = Failure in Resending message store\n
00088  *         If there is not enough memory (or User given limit exceeded) for storing
00089  *         resending messages, situation is ignored.
00090  */
00091 extern int16_t sn_coap_protocol_build(struct coap_s *handle, sn_nsdl_addr_s *dst_addr_ptr, uint8_t *dst_packet_data_ptr, sn_coap_hdr_s *src_coap_msg_ptr, void *param);
00092 
00093 /**
00094  * \fn sn_coap_hdr_s *sn_coap_protocol_parse(struct coap_s *handle, sn_nsdl_addr_s *src_addr_ptr, uint16_t packet_data_len, uint8_t *packet_data_ptr)
00095  *
00096  * \brief Parses received CoAP message from given Packet data
00097  *
00098  * \param *src_addr_ptr is pointer to source address of received CoAP message
00099  *        (CoAP parser needs that information for Message acknowledgement)
00100  *
00101  * \param *handle Pointer to CoAP library handle
00102  *
00103  * \param packet_data_len is length of given Packet data to be parsed to CoAP message
00104  *
00105  * \param *packet_data_ptr is pointer to source of Packet data to be parsed to CoAP message
00106  *
00107  * \param param void pointer that will be passed to tx/rx function callback when those are called.
00108  *
00109  * \return Return value is pointer to parsed CoAP message structure. This structure includes also coap_status field.\n
00110  *         In following failure cases NULL is returned:\n
00111  *          -Given NULL pointer\n
00112  *          -Failure in parsed header of non-confirmable message\ŋ
00113  *          -Out of memory (malloc() returns NULL)
00114  */
00115 extern sn_coap_hdr_s *sn_coap_protocol_parse(struct coap_s *handle, sn_nsdl_addr_s *src_addr_ptr, uint16_t packet_data_len, uint8_t *packet_data_ptr, void *);
00116 
00117 /**
00118  * \fn int8_t sn_coap_protocol_exec(struct coap_s *handle, uint32_t current_time)
00119  *
00120  * \brief Sends CoAP messages from re-sending queue, if there is any.
00121  *        Cleans also old messages from the duplication list and from block receiving list
00122  *
00123  *        This function can be called e.g. once in a second but also more frequently.
00124  *
00125  * \param *handle Pointer to CoAP library handle
00126  *
00127  * \param current_time is System time in seconds. This time is
00128  *        used for message re-sending timing and to identify old saved data.
00129  *
00130  * \return  0 if success
00131  *          -1 if failed
00132  */
00133 
00134 extern int8_t sn_coap_protocol_exec(struct coap_s *handle, uint32_t current_time);
00135 
00136 /**
00137  * \fn int8_t sn_coap_protocol_set_block_size(uint16_t block_size)
00138  *
00139  * \brief If block transfer is enabled, this function changes the block size.
00140  *
00141  * \param uint16_t block_size maximum size of CoAP payload. Valid sizes are 16, 32, 64, 128, 256, 512 and 1024 bytes
00142  * \return  0 = success
00143  *          -1 = failure
00144  */
00145 extern int8_t sn_coap_protocol_set_block_size(struct coap_s *handle, uint16_t block_size);
00146 
00147 /**
00148  * \fn int8_t sn_coap_protocol_set_duplicate_buffer_size(uint8_t message_count)
00149  *
00150  * \brief If dublicate message detection is enabled, this function changes buffer size.
00151  *
00152  * \param uint8_t message_count max number of messages saved for duplicate control
00153  * \return  0 = success
00154  *          -1 = failure
00155  */
00156 extern int8_t sn_coap_protocol_set_duplicate_buffer_size(struct coap_s *handle, uint8_t message_count);
00157 
00158 /**
00159  * \fn int8_t sn_coap_protocol_set_retransmission_parameters(uint8_t resending_count, uint8_t resending_intervall)
00160  *
00161  * \brief  If re-transmissions are enabled, this function changes resending count and interval.
00162  *
00163  * \param uint8_t resending_count max number of resendings for message
00164  * \param uint8_t resending_intervall message resending intervall in seconds
00165  * \return  0 = success, -1 = failure
00166  */
00167 extern int8_t sn_coap_protocol_set_retransmission_parameters(struct coap_s *handle,
00168         uint8_t resending_count, uint8_t resending_interval);
00169 
00170 /**
00171  * \fn int8_t sn_coap_protocol_set_retransmission_buffer(uint8_t buffer_size_messages, uint16_t buffer_size_bytes)
00172  *
00173  * \brief If re-transmissions are enabled, this function changes message retransmission queue size.
00174  *  Set size to '0' to disable feature. If both are set to '0', then re-sendings are disabled.
00175  *
00176  * \param uint8_t buffer_size_messages queue size - maximum number of messages to be saved to queue
00177  * \param uint8_t buffer_size_bytes queue size - maximum size of messages saved to queue
00178  * \return  0 = success, -1 = failure
00179  */
00180 extern int8_t sn_coap_protocol_set_retransmission_buffer(struct coap_s *handle,
00181         uint8_t buffer_size_messages, uint16_t buffer_size_bytes);
00182 
00183 /**
00184  * \fn void sn_coap_protocol_clear_retransmission_buffer(struct coap_s *handle)
00185  *
00186  * \param *handle Pointer to CoAP library handle
00187  *
00188  * \brief If re-transmissions are enabled, this function removes all messages from the retransmission queue.
00189  */
00190 extern void sn_coap_protocol_clear_retransmission_buffer(struct coap_s *handle);
00191 
00192 /**
00193  * \fn sn_coap_protocol_block_remove
00194  *
00195  * \brief Remove saved block data. Can be used to remove the data from RAM to enable storing it to other place.
00196  *
00197  * \param handle Pointer to CoAP library handle
00198  * \param source_address Addres from where the block has been received.
00199  * \param payload_length Length of the coap payload of the block.
00200  * \param payload Coap payload of the block.
00201  *
00202  */
00203 extern void sn_coap_protocol_block_remove(struct coap_s *handle, sn_nsdl_addr_s *source_address, uint16_t payload_length, void *payload);
00204 
00205 /**
00206  * \fn sn_coap_protocol_remove_sent_blockwise_message
00207  *
00208  * \brief Remove sent blockwise message from the linked list.
00209  *
00210  * \param handle Pointer to CoAP library handle
00211  * \param message_id Message id to be removed.
00212  *
00213  */
00214 extern void sn_coap_protocol_remove_sent_blockwise_message(struct coap_s *handle, uint16_t message_id);
00215 
00216 /**
00217  * \fn void sn_coap_protocol_delete_retransmission(struct coap_s *handle)
00218  *
00219  * \param *handle Pointer to CoAP library handle
00220  * \msg_id message ID to be removed
00221  * \return returns 0 when success, -1 for invalid parameter, -2 if message was not found
00222  *
00223  * \brief If re-transmissions are enabled, this function removes message from retransmission buffer.
00224  */
00225 extern int8_t sn_coap_protocol_delete_retransmission(struct coap_s *handle, uint16_t msg_id);
00226 
00227 /**
00228  * \fn int8_t sn_coap_convert_block_size(uint16_t block_size)
00229  *
00230  * \brief Utility function to convert block size.
00231  *
00232  * \param block_size Block size to convert.
00233  *
00234  * \return Value of range 0 - 6
00235  */
00236 extern int8_t sn_coap_convert_block_size(uint16_t block_size);
00237 
00238 /**
00239  * \fn int8_t sn_coap_protocol_handle_block2_response_internally(struct coap_s *handle, uint8_t handle_response)
00240  *
00241  * \brief This function change the state whether CoAP library sends the block 2 response automatically or not.
00242  *
00243  * \param *handle Pointer to CoAP library handle
00244  * \param handle_response 1 if CoAP library handles the response sending otherwise 0.
00245  *
00246  * \return  0 = success, -1 = failure
00247  */
00248 extern int8_t sn_coap_protocol_handle_block2_response_internally(struct coap_s *handle, uint8_t handle_response);
00249 
00250 /**
00251  * \fn void sn_coap_protocol_clear_sent_blockwise_messages(struct coap_s *handle)
00252  *
00253  * \brief This function clears all the sent blockwise messages from the linked list.
00254  *
00255  * \param *handle Pointer to CoAP library handle
00256  */
00257 extern void sn_coap_protocol_clear_sent_blockwise_messages(struct coap_s *handle);
00258 
00259 /**
00260  * \fn void sn_coap_protocol_send_rst(struct coap_s *handle, uint16_t msg_id, sn_nsdl_addr_s *addr_ptr, void *param)
00261  *
00262  * \brief This function sends a RESET message.
00263  *
00264  * \param *handle Pointer to CoAP library handle
00265  * \param msg_id Message id.
00266  * \param addr_ptr Pointer to destination address where CoAP message will be sent
00267  * \param param Pointer that will be passed to tx function callback
00268  */
00269 extern void sn_coap_protocol_send_rst(struct coap_s *handle, uint16_t msg_id, sn_nsdl_addr_s *addr_ptr, void *param);
00270 
00271 #endif /* SN_COAP_PROTOCOL_H_ */
00272 
00273 #ifdef __cplusplus
00274 }
00275 #endif