1: #ifndef __AITMQTT_H
2: #define __AITMQTT_H
3:
4:
5: #define MQTT_DATA_MAX 268435455
6: #define MQTT_CONN_STR "MQIsdp"
7: #define MQTT_PROTO_VER 3
8: #define MQTT_KEEPALIVE 10
9:
10: /* FIXED HEADER */
11:
12: struct mqtthdr {
13: struct {
14: unsigned char retain:1,
15: qos:2,
16: dup:1,
17: type:4;
18: } mqtt_msg;
19: unsigned char mqtt_len[1]; /* may be grow to 4 bytes */
20: } __packed;
21:
22: #define MQTT_TYPE_UNKNOWN 0 /* reserved */
23: #define MQTT_TYPE_CONNECT 1 /* client request to connect to server */
24: #define MQTT_TYPE_CONNACK 2 /* connect acknowledgment */
25: #define MQTT_TYPE_PUBLISH 3 /* publish message */
26: #define MQTT_TYPE_PUBACK 4 /* publish acknowledgment */
27: #define MQTT_TYPE_PUBREC 5 /* publish received (assured delivery part 1) */
28: #define MQTT_TYPE_PUBREL 6 /* publish release (assured delivery part 2) */
29: #define MQTT_TYPE_PUBCOMP 7 /* publish complete (assured delivery part 3) */
30: #define MQTT_TYPE_SUBSCRIBE 8 /* client subscribe request */
31: #define MQTT_TYPE_SUBACK 9 /* subscribe acknowledgment */
32: #define MQTT_TYPE_UNSUBSCRIBE 10 /* client unsubscribe request */
33: #define MQTT_TYPE_UNSUBACK 11 /* unsubscribe acknowledgment */
34: #define MQTT_TYPE_PINGREQ 12 /* PING request */
35: #define MQTT_TYPE_PINGRESP 13 /* PING response */
36: #define MQTT_TYPE_DISCONNECT 14 /* client is disconnecting */
37: #define MQTT_TYPE_RESERVED 15 /* reserved */
38:
39: #define MQTT_FLAG_DUP 1 /* This flag is set when the client or server attempts to re-deliver
40: a PUBLISH, PUBREL, SUBSCRIBE or UNSUBSCRIBE message.
41: This applies to messages where the value of QoS is greater than
42: zero (0), and an acknowledgment is required.
43: When the DUP bit is set, the variable header includes a Message ID.
44:
45: The recipient should treat this flag as a hint as to whether
46: the message may have been previously received.
47: It should not be relied on to detect duplicates. */
48:
49: #define MQTT_QOS_ONCE 0 /* At most once, Fire and Forget, <=1 */
50: #define MQTT_QOS_ACK 1 /* At least once, Acknowledged delivery, >=1 */
51: #define MQTT_QOS_EXACTLY 2 /* Exactly once, Assured delivery, =1 */
52: #define MQTT_QOS_RESERVED 3 /* reserved */
53:
54: #define MQTT_FLAG_RETAIN 1 /* This flag is only used on PUBLISH messages.
55:
56: When a client sends a PUBLISH to a server,
57: if the Retain flag is set (1),
58: the server should hold on to the message after it has been
59: delivered to the current subscribers.
60: When a new subscription is established on a topic,
61: the last retained message on that topic should be sent to
62: the subscriber with the Retain flag set.
63: If there is no retained message, nothing is sent
64: This is useful where publishers send messages on a
65: "report by exception" basis, where it might be some time between messages.
66: This allows new subscribers to instantly receive data with the retained,
67: or Last Known Good, value.
68:
69: When a server sends a PUBLISH to a client as a result of
70: a subscription that already existed when the original PUBLISH arrived,
71: the Retain flag should not be set, regardless of the Retain flag
72: of the original PUBLISH. This allows a client to distinguish messages
73: that are being received because they were retained and those
74: that are being received "live".
75:
76: Retained messages should be kept over restarts of the server.
77: A server may delete a retained message if it receives a message
78: with a zero-length payload and the Retain flag set on the same topic. */
79:
80: /* VARIABLE HEADERS */
81:
82: #define MQTT_RETCODE_ACCEPTED 0
83: #define MQTT_RETCODE_REFUSE_VER 1
84: #define MQTT_RETCODE_REFUSE_ID 2
85: #define MQTT_RETCODE_REFUSE_UNAVAIL 3
86: #define MQTT_RETCODE_REFUSE_USERPASS 4
87: #define MQTT_RETCODE_DENIED 5
88:
89:
90: typedef union {
91: struct {
92: unsigned short m:8,
93: l:8;
94: } sb;
95: unsigned short val;
96: } mqtt_v_t;
97:
98: typedef struct {
99: mqtt_v_t var_sb;
100: unsigned char var_data[0];
101: } __packed mqtthdr_var_t;
102: #define MQTTHDR_VAR_SIZEOF(x) (assert((x)), sizeof(mqtt_v_t) + ntohs((x)->var_sb.val))
103:
104: typedef unsigned char mqtthdr_protover_t;
105: typedef unsigned char mqtthdr_retcode_t;
106:
107: typedef struct {
108: unsigned char reserved:1,
109: clean_sess:1,
110: will_flg:1,
111: will_qos:2,
112: will_retain:1,
113: password:1,
114: username:1;
115: } __packed mqtthdr_connflgs_t;
116:
117: typedef struct {
118: unsigned char reserved;
119: unsigned char retcode;
120: } __packed mqtthdr_connack_t;
121:
122:
123: /* MQTT Message buffer */
124:
125: typedef struct {
126: void *msg_base;
127: unsigned short msg_len;
128: } mqtt_msg_t;
129:
130:
131: // -------------------------------------------------------
132: // mqtt_GetErrno() Get error code of last operation
133: inline int mqtt_GetErrno();
134: // mqtt_GetError() Get error text of last operation
135: inline const char *mqtt_GetError();
136: // -------------------------------------------------------
137:
138:
139: /*
140: * mqtt_msgAlloc() Allocate memory for MQTT Message
141: * @len = >0 Allocate buffer with length
142: * return: NULL error or Message, after use must call mqtt_msgFree() with all!=0
143: */
144: inline mqtt_msg_t *mqtt_msgAlloc(unsigned short len);
145: /*
146: * mqtt_msgFree() Free MQTT message
147: * @msg = Message buffer
148: * @all = !=0 Destroy entire message, if MQTT Message allocated with mqtt_msgAlloc()
149: * return: none
150: */
151: inline void mqtt_msgFree(mqtt_msg_t ** __restrict msg, int all);
152: /*
153: * mqtt_msgRealloc() Reallocate MQTT message buffer
154: * @msg = MQTT message
155: * @len = new length
156: * return: -1 error or >-1 old buffer length
157: */
158: inline int mqtt_msgRealloc(mqtt_msg_t * __restrict msg, unsigned short len);
159:
160: /*
161: * mqtt_encodeLen() Encode number to MQTT length field
162: * @num = number for encode
163: * return: -1 error or >-1 length
164: */
165: inline unsigned int mqtt_encodeLen(unsigned int num);
166: /*
167: * mqtt_decodeLen() Decode length from MQTT packet
168: * @len = length
169: * @n = sizeof bytes, if !=NULL
170: * return: -1 error, >-1 length of message
171: */
172: inline unsigned int mqtt_decodeLen(unsigned int len, char *n);
173: /*
174: * mqtt_sizeLen Return sizeof len field
175: * @len = length
176: * return: -1 error, >-1 sizeof len in bytes
177: */
178: inline char mqtt_sizeLen(unsigned int len);
179: /*
180: * mqtt_str2var Create MQTT variable from string
181: * @csStr = string
182: * @strLen = string length
183: * return: NULL error or != ok variable, must be free after use!
184: */
185: inline mqtthdr_var_t *mqtt_str2var(const unsigned char *csStr, unsigned short strLen);
186:
187: /*
188: * mqtt_msgCONNECT() Create CONNECT message
189: *
190: * @buf = Message buffer
191: * @csConnID = ConnectID
192: * @csUser = Username if !=NULL
193: * @csPass = Password for Username, only if csUser is set
194: * @csWillTopic = Will Topic if !=NULL Will Flags set into message
195: * @csWillMessage = Will Message, may be NULL
196: * @ClrSess = Clear Session subscriptions after disconnect
197: * @WillQOS = Will QOS if csWillTopic is set
198: * @WillRetain = Will Retain Will Message if csWillTopic is set
199: * return: -1 error or >-1 message size for send
200: */
201: int mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const char *csConnID,
202: const char *csUser, const char *csPass,
203: const char *csWillTopic, const char *csWillMessage,
204: unsigned char ClrSess, unsigned char WillQOS, unsigned char WillRetain);
205: /*
206: * mqtt_msgCONNACK() Create CONNACK message
207: *
208: * @buf = Message buffer
209: * @retcode = Return code
210: * return: -1 error or >-1 message size for send
211: */
212: int mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, unsigned char retcode);
213: /*
214: * mqtt_msgPUBLISH() Create PUBLISH message
215: *
216: * @buf = Message buffer
217: * @csTopic = Publish topic
218: * @msgID = MessageID >0, if QOS != MQTT_QOS_ONCE
219: * @Dup = Duplicate message
220: * @QOS = QoS
221: * @Retain = Retain message
222: * return: -1 error or >-1 message size for send
223: */
224: int mqtt_msgPUBLISH(mqtt_msg_t * __restrict buf, const char *csTopic, unsigned short msgID,
225: unsigned char Dup, unsigned char QOS, unsigned char Retain);
226: /*
227: * mqtt_msgPUBACK() Create PUBACK message
228: *
229: * @buf = Message buffer
230: * @msgID = MessageID
231: * return: -1 error or >-1 message size for send
232: */
233: inline int mqtt_msgPUBACK(mqtt_msg_t * __restrict buf, unsigned short msgID);
234: /*
235: * mqtt_msgPUBREC() Create PUBREC message
236: *
237: * @buf = Message buffer
238: * @msgID = MessageID
239: * return: -1 error or >-1 message size for send
240: */
241: inline int mqtt_msgPUBREC(mqtt_msg_t * __restrict buf, unsigned short msgID);
242: /*
243: * mqtt_msgPUBREL() Create PUBREL message
244: *
245: * @buf = Message buffer
246: * @msgID = MessageID
247: * return: -1 error or >-1 message size for send
248: */
249: inline int mqtt_msgPUBREL(mqtt_msg_t * __restrict buf, unsigned short msgID);
250: /*
251: * mqtt_msgPUBCOMP() Create PUBCOMP message
252: *
253: * @buf = Message buffer
254: * @msgID = MessageID
255: * return: -1 error or >-1 message size for send
256: */
257: inline int mqtt_msgPUBCOMP(mqtt_msg_t * __restrict buf, unsigned short msgID);
258:
259:
260: #endif
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