196 lines
7.5 KiB
C
196 lines
7.5 KiB
C
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#ifndef LWMQTT_PACKET_H
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#define LWMQTT_PACKET_H
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#include <stdbool.h>
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#include <lwmqtt.h>
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#include "helpers.h"
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/**
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* The available packet types.
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*/
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typedef enum {
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LWMQTT_NO_PACKET = 0,
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LWMQTT_CONNECT_PACKET = 1,
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LWMQTT_CONNACK_PACKET,
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LWMQTT_PUBLISH_PACKET,
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LWMQTT_PUBACK_PACKET,
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LWMQTT_PUBREC_PACKET,
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LWMQTT_PUBREL_PACKET,
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LWMQTT_PUBCOMP_PACKET,
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LWMQTT_SUBSCRIBE_PACKET,
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LWMQTT_SUBACK_PACKET,
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LWMQTT_UNSUBSCRIBE_PACKET,
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LWMQTT_UNSUBACK_PACKET,
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LWMQTT_PINGREQ_PACKET,
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LWMQTT_PINGRESP_PACKET,
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LWMQTT_DISCONNECT_PACKET
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} lwmqtt_packet_type_t;
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/**
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* Will detect the packet type from the at least one byte long buffer.
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*
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* @param buf - The buffer from which the packet type will be detected.
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* @param packet_type - Pointer to the receiver of the packet type.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_detect_packet_type(unsigned char *buf, lwmqtt_packet_type_t *packet_type);
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/**
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* Will detect the remaining length form the at least on byte long buffer.
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*
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* It will return LWMQTT_BUFFER_TOO_SHORT if the buffer is to short and an additional byte should be read from the
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* network. In case the remaining length is overflowed it will return LWMQTT_REMAINING_LENGTH_OVERFLOW.
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*
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* @param buf - The buffer from which the remaining length will be detected.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_detect_remaining_length(unsigned char *buf, int buf_len, int *rem_len);
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/**
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* Encodes a connect packet into the supplied buffer.
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*
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* @param buf - The buffer into which the packet will be encoded.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @param len - The encoded length of the packet.
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* @param options - The options to be used to build the connect packet.
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* @param will - The last will and testament.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_encode_connect(unsigned char *buf, int buf_len, int *len, lwmqtt_options_t *options,
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lwmqtt_will_t *will);
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/**
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* Decodes a connack packet from the supplied buffer.
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*
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* @param session_present - The session present flag.
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* @param return_code - The return code.
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* @param buf - The raw buffer data.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_decode_connack(bool *session_present, lwmqtt_return_code_t *return_code, unsigned char *buf,
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int buf_len);
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/**
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* Encodes a zero (disconnect) packet into the supplied buffer.
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*
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* @param buf - The buffer into which the packet will be encoded.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @param len - The encoded length of the packet.
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* @param packet_type - The packets type.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_encode_zero(unsigned char *buf, int buf_len, int *len, lwmqtt_packet_type_t packet_type);
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/**
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* Decodes an ack (puback, pubrec, pubrel, pubcomp, unsuback) packet from the supplied buffer.
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*
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* @param packet_type - The packet type.
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* @param dup - The dup flag.
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* @param packet_id - The packet id.
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* @param buf - The raw buffer data.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_decode_ack(lwmqtt_packet_type_t *packet_type, bool *dup, unsigned short *packet_id,
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unsigned char *buf, int buf_len);
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/**
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* Encodes an ack (puback, pubrec, pubrel, pubcomp) packet into the supplied buffer.
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*
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* @param buf - The buffer into which the packet will be encoded.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @param len - The encoded length of the packet.
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* @param packet_type - The packets type.
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* @param dup - The dup flag.
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* @param packet_id - The packet id.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_encode_ack(unsigned char *buf, int buf_len, int *len, lwmqtt_packet_type_t packet_type, bool dup,
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unsigned short packet_id);
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/**
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* Decodes a publish packet from the supplied buffer.
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*
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* @param dup - The dup flag.
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* @param qos - The QoS level.
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* @param retained- The retained flag.
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* @param packet_id - The packet id.
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* @param topic - The topic.
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* @param payload - The payload data.
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* @param payload_len - The length of the payload.
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* @param buf - The raw buffer data.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_decode_publish(bool *dup, lwmqtt_qos_t *qos, bool *retained, unsigned short *packet_id,
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lwmqtt_string_t *topic, unsigned char **payload, int *payload_len,
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unsigned char *buf, int buf_len);
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/**
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* Encodes a publish packet into the supplied buffer.
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*
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* @param buf - The buffer into which the packet will be encoded.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @param len - The encoded length of the packet.
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* @param dup - The dup flag.
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* @param qos - The QoS level.
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* @param retained- The retained flag.
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* @param packet_id - The packet id.
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* @param topic - The topic.
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* @param payload - The payload data.
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* @param payload_len - The length of the payload.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_encode_publish(unsigned char *buf, int buf_len, int *len, bool dup, lwmqtt_qos_t qos, bool retained,
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unsigned short packet_id, lwmqtt_string_t topic, unsigned char *payload,
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int payload_len);
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/**
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* Encodes a subscribe packet into the supplied buffer.
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*
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* @param buf - The buffer into which the packet will be encoded.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @param len - The encoded length of the packet.
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* @param packet_id - The packet id.
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* @param count - The number of members in the topic_filters and qos_levels array.
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* @param topic_filters - The array of topic filter.
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* @param qos_levels - The array of requested QoS levels.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_encode_subscribe(unsigned char *buf, int buf_len, int *len, unsigned short packet_id, int count,
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lwmqtt_string_t *topic_filters, lwmqtt_qos_t *qos_levels);
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/**
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* Decodes a suback packet from the supplied buffer.
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*
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* @param packet_id - The packet id.
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* @param max_count - The maximum number of members allowed in the granted_qos_levels array.
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* @param count - The number of members in the granted_qos_levels array.
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* @param granted_qos_levels - The granted QoS levels.
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* @param buf - The raw buffer data.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_decode_suback(unsigned short *packet_id, int max_count, int *count,
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lwmqtt_qos_t *granted_qos_levels, unsigned char *buf, int buf_len);
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/**
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* Encodes the supplied unsubscribe data into the supplied buffer, ready for sending
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*
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* @param buf - The buffer into which the packet will be encoded.
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* @param buf_len - The length in bytes of the supplied buffer.
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* @param len - The encoded length of the packet.
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* @param packet_id - The packet id.
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* @param count - The number of members in the topic_filters array.
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* @param topic_filters - The array of topic filters.
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* @return An error value.
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*/
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lwmqtt_err_t lwmqtt_encode_unsubscribe(unsigned char *buf, int buf_len, int *len, unsigned short packet_id, int count,
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lwmqtt_string_t *topic_filters);
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#endif // LWMQTT_PACKET_H
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