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 sub_sb;
100: char *sub_data;
101: unsigned char sub_qos;
102: } mqtt_subscr_t;
103:
104: typedef struct {
105: mqtt_v_t var_sb;
106: unsigned char var_data[0];
107: } __packed mqtthdr_var_t;
108: #define MQTTHDR_VAR_SIZEOF(x) (assert((x)), sizeof(mqtt_v_t) + ntohs((x)->var_sb.val))
109:
110: typedef unsigned char mqtthdr_protover_t;
111:
112: typedef struct {
113: unsigned char reserved:1,
114: clean_sess:1,
115: will_flg:1,
116: will_qos:2,
117: will_retain:1,
118: password:1,
119: username:1;
120: } __packed mqtthdr_connflgs_t;
121:
122: typedef struct {
123: unsigned char reserved;
124: unsigned char retcode;
125: } __packed mqtthdr_connack_t;
126:
127:
128: /* MQTT Message buffer */
129:
130: typedef struct {
131: void *msg_base;
132: unsigned short msg_len;
133: } mqtt_msg_t;
134:
135:
136: // -------------------------------------------------------
137: // mqtt_GetErrno() Get error code of last operation
138: inline int mqtt_GetErrno();
139: // mqtt_GetError() Get error text of last operation
140: inline const char *mqtt_GetError();
141: // -------------------------------------------------------
142:
143:
144: /*
145: * mqtt_msgAlloc() Allocate memory for MQTT Message
146: *
147: * @len = >0 Allocate buffer with length
148: * return: NULL error or Message, after use must call mqtt_msgFree() with all!=0
149: */
150: inline mqtt_msg_t *mqtt_msgAlloc(unsigned short len);
151: /*
152: * mqtt_msgFree() Free MQTT message
153: *
154: * @msg = Message buffer
155: * @all = !=0 Destroy entire message, if MQTT Message allocated with mqtt_msgAlloc()
156: * return: none
157: */
158: inline void mqtt_msgFree(mqtt_msg_t ** __restrict msg, int all);
159: /*
160: * mqtt_msgRealloc() Reallocate MQTT message buffer
161: *
162: * @msg = MQTT message
163: * @len = new length
164: * return: -1 error or >-1 old buffer length
165: */
166: inline int mqtt_msgRealloc(mqtt_msg_t * __restrict msg, unsigned short len);
167:
168: /*
169: * mqtt_encodeLen() Encode number to MQTT length field
170: *
171: * @num = number for encode
172: * return: -1 error or >-1 length
173: */
174: inline unsigned int mqtt_encodeLen(unsigned int num);
175: /*
176: * mqtt_decodeLen() Decode length from MQTT packet
177: *
178: * @len = length
179: * @n = sizeof bytes, if !=NULL
180: * return: -1 error, >-1 length of message
181: */
182: inline unsigned int mqtt_decodeLen(unsigned int len, char *n);
183: /*
184: * mqtt_sizeLen Return sizeof len field
185: *
186: * @len = length
187: * return: -1 error, >-1 sizeof len in bytes
188: */
189: inline char mqtt_sizeLen(unsigned int len);
190: /*
191: * mqtt_str2sub Create MQTT subscribe variable from string(s)
192: *
193: * @csStr = strings
194: * @strnum = number of strings elements
195: * @qoses = QoS elements applied to subscribe variable,
196: * count of elements must be equal with csStr elements
197: * return: NULL error or != subscribe variables array, must be free after use with mqtt_freeSub()
198: */
199: inline mqtt_subscr_t *mqtt_str2sub(const char **csStr, unsigned short strnum, unsigned char *qoses);
200: /*
201: * mqtt_subFree() Free array from subscribe variables
202: *
203: * @subs = Subscribe variables
204: * @all = if !=0 free and subs pointer
205: * return: none
206: */
207: inline void mqtt_subFree(mqtt_subscr_t ** __restrict subs, int all);
208: /*
209: * mqtt_subAlloc() Create array from subscribe variables
210: *
211: * @num = Number of elements
212: * return: NULL error or subscribe array, after use must call mqtt_subFree() with all!=0
213: */
214: inline mqtt_subscr_t *mqtt_subAlloc(unsigned short num);
215:
216: /*
217: * mqtt_msgCONNECT() Create CONNECT message
218: *
219: * @buf = Message buffer
220: * @csConnID = ConnectID
221: * @csUser = Username if !=NULL
222: * @csPass = Password for Username, only if csUser is set
223: * @csWillTopic = Will Topic if !=NULL Will Flags set into message
224: * @csWillMessage = Will Message, may be NULL
225: * @ClrSess = Clear Session subscriptions after disconnect
226: * @WillQOS = Will QOS if csWillTopic is set
227: * @WillRetain = Will Retain Will Message if csWillTopic is set
228: * return: -1 error or >-1 message size for send
229: */
230: int mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const char *csConnID,
231: const char *csUser, const char *csPass,
232: const char *csWillTopic, const char *csWillMessage,
233: unsigned char ClrSess, unsigned char WillQOS, unsigned char WillRetain);
234: /*
235: * mqtt_msgCONNACK() Create CONNACK message
236: *
237: * @buf = Message buffer
238: * @retcode = Return code
239: * return: -1 error or >-1 message size for send
240: */
241: int mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, unsigned char retcode);
242:
243: /*
244: * mqtt_msgPUBLISH() Create PUBLISH message
245: *
246: * @buf = Message buffer
247: * @csTopic = Publish topic
248: * @msgID = MessageID >0, if QOS != MQTT_QOS_ONCE
249: * @Dup = Duplicate message
250: * @QOS = QoS
251: * @Retain = Retain message
252: * @pData = Publish data into topic
253: * @datlen = Publish data length
254: * return: -1 error or >-1 message size for send
255: */
256: int mqtt_msgPUBLISH(mqtt_msg_t * __restrict buf, const char *csTopic, unsigned short msgID,
257: unsigned char Dup, unsigned char QOS, unsigned char Retain,
258: const void *pData, unsigned short datlen);
259: /*
260: * mqtt_msgPUBACK() Create PUBACK message
261: *
262: * @buf = Message buffer
263: * @msgID = MessageID
264: * return: -1 error or >-1 message size for send
265: */
266: inline int mqtt_msgPUBACK(mqtt_msg_t * __restrict buf, unsigned short msgID);
267: /*
268: * mqtt_msgPUBREC() Create PUBREC message
269: *
270: * @buf = Message buffer
271: * @msgID = MessageID
272: * return: -1 error or >-1 message size for send
273: */
274: inline int mqtt_msgPUBREC(mqtt_msg_t * __restrict buf, unsigned short msgID);
275: /*
276: * mqtt_msgPUBREL() Create PUBREL message
277: *
278: * @buf = Message buffer
279: * @msgID = MessageID
280: * return: -1 error or >-1 message size for send
281: */
282: inline int mqtt_msgPUBREL(mqtt_msg_t * __restrict buf, unsigned short msgID);
283: /*
284: * mqtt_msgPUBCOMP() Create PUBCOMP message
285: *
286: * @buf = Message buffer
287: * @msgID = MessageID
288: * return: -1 error or >-1 message size for send
289: */
290: inline int mqtt_msgPUBCOMP(mqtt_msg_t * __restrict buf, unsigned short msgID);
291:
292: /*
293: * mqtt_msgSUBSCRIBE() Create SUBSCRIBE message
294: *
295: * @buf = Message buffer
296: * @Topics = MQTT subscription topics
297: * @msgID = MessageID
298: * @Dup = Duplicate message
299: * @QOS = QoS
300: * return: -1 error or >-1 message size for send
301: */
302: int
303: mqtt_msgSUBSCRIBE(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
304: unsigned short msgID, unsigned char Dup, unsigned char QOS);
305: /*
306: * mqtt_msgSUBACK() Create SUBACK message
307: *
308: * @buf = Message buffer
309: * @Topics = MQTT subscription topics
310: * @msgID = MessageID
311: * return: -1 error or >-1 message size for send
312: */
313: int mqtt_msgSUBACK(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
314: unsigned short msgID);
315:
316:
317: #endif
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