1: #ifndef __AITMQTT_H
2: #define __AITMQTT_H
3:
4:
5: /* FIXED HEADER */
6:
7: struct mqtthdr {
8: union {
9: struct {
10: unsigned char retain:1,
11: qos:2,
12: dup:1,
13: type:4;
14: };
15: unsigned char val;
16: } mqtt_msg;
17: unsigned char mqtt_len[1]; /* may be grow to 4 bytes */
18: } __packed;
19: #define MQTTHDR_MSGINIT(x) (assert((x)), (x)->mqtt_msg.val ^= (x)->mqtt_msg.val)
20:
21: #define MQTT_TYPE_UNKNOWN 0 /* reserved */
22: #define MQTT_TYPE_CONNECT 1 /* client request to connect to server */
23: #define MQTT_TYPE_CONNACK 2 /* connect acknowledgment */
24: #define MQTT_TYPE_PUBLISH 3 /* publish message */
25: #define MQTT_TYPE_PUBACK 4 /* publish acknowledgment */
26: #define MQTT_TYPE_PUBREC 5 /* publish received (assured delivery part 1) */
27: #define MQTT_TYPE_PUBREL 6 /* publish release (assured delivery part 2) */
28: #define MQTT_TYPE_PUBCOMP 7 /* publish complete (assured delivery part 3) */
29: #define MQTT_TYPE_SUBSCRIBE 8 /* client subscribe request */
30: #define MQTT_TYPE_SUBACK 9 /* subscribe acknowledgment */
31: #define MQTT_TYPE_UNSUBSCRIBE 10 /* client unsubscribe request */
32: #define MQTT_TYPE_UNSUBACK 11 /* unsubscribe acknowledgment */
33: #define MQTT_TYPE_PINGREQ 12 /* PING request */
34: #define MQTT_TYPE_PINGRESP 13 /* PING response */
35: #define MQTT_TYPE_DISCONNECT 14 /* client is disconnecting */
36: #define MQTT_TYPE_MAX 15 /* reserved */
37:
38: #define MQTT_FLAG_DUP 1 /* This flag is set when the client or server attempts to re-deliver
39: a PUBLISH, PUBREL, SUBSCRIBE or UNSUBSCRIBE message.
40: This applies to messages where the value of QoS is greater than
41: zero (0), and an acknowledgment is required.
42: When the DUP bit is set, the variable header includes a Message ID.
43:
44: The recipient should treat this flag as a hint as to whether
45: the message may have been previously received.
46: It should not be relied on to detect duplicates. */
47:
48: #define MQTT_QOS_ONCE 0 /* At most once, Fire and Forget, <=1 */
49: #define MQTT_QOS_ACK 1 /* At least once, Acknowledged delivery, >=1 */
50: #define MQTT_QOS_EXACTLY 2 /* Exactly once, Assured delivery, =1 */
51: #define MQTT_QOS_RESERVED 3 /* reserved */
52:
53: #define MQTT_FLAG_RETAIN 1 /* This flag is only used on PUBLISH messages.
54:
55: When a client sends a PUBLISH to a server,
56: if the Retain flag is set (1),
57: the server should hold on to the message after it has been
58: delivered to the current subscribers.
59: When a new subscription is established on a topic,
60: the last retained message on that topic should be sent to
61: the subscriber with the Retain flag set.
62: If there is no retained message, nothing is sent
63: This is useful where publishers send messages on a
64: "report by exception" basis, where it might be some time between messages.
65: This allows new subscribers to instantly receive data with the retained,
66: or Last Known Good, value.
67:
68: When a server sends a PUBLISH to a client as a result of
69: a subscription that already existed when the original PUBLISH arrived,
70: the Retain flag should not be set, regardless of the Retain flag
71: of the original PUBLISH. This allows a client to distinguish messages
72: that are being received because they were retained and those
73: that are being received "live".
74:
75: Retained messages should be kept over restarts of the server.
76: A server may delete a retained message if it receives a message
77: with a zero-length payload and the Retain flag set on the same topic. */
78:
79: /* VARIABLE HEADERS */
80:
81: #define MQTT_RETCODE_ACCEPTED 0
82: #define MQTT_RETCODE_REFUSE_VER 1
83: #define MQTT_RETCODE_REFUSE_ID 2
84: #define MQTT_RETCODE_REFUSE_UNAVAIL 3
85: #define MQTT_RETCODE_REFUSE_USERPASS 4
86: #define MQTT_RETCODE_DENIED 5
87:
88:
89: typedef union {
90: struct {
91: unsigned short m:8,
92: l:8;
93: } sb;
94: unsigned short val;
95: } mqtt_v_t;
96:
97: typedef struct {
98: unsigned char sub_ret;
99: struct __sbuf sub_topic;
100: struct __sbuf sub_value;
101: } mqtt_subscr_t;
102:
103: typedef struct {
104: mqtt_v_t var_sb;
105: unsigned char var_data[0];
106: } __packed mqtthdr_var_t;
107: #define MQTTHDR_VAR_SIZEOF(x) (assert((x)), sizeof(mqtt_v_t) + ntohs((x)->var_sb.val))
108:
109: typedef unsigned char mqtthdr_protover_t;
110:
111: typedef struct {
112: unsigned char reserved:1,
113: clean_sess:1,
114: will_flg:1,
115: will_qos:2,
116: will_retain:1,
117: password:1,
118: username:1;
119: } __packed mqtthdr_connflgs_t;
120:
121: typedef struct {
122: unsigned char reserved;
123: unsigned char retcode;
124: } __packed mqtthdr_connack_t;
125:
126:
127: /* MQTT Message buffer */
128:
129: typedef struct {
130: void *msg_base;
131: unsigned short msg_len;
132: } mqtt_msg_t;
133:
134: /* MQTT dispatcher callbacks */
135:
136: typedef int (*mqtt_cb_t)(void *);
137:
138:
139: // -------------------------------------------------------
140: // mqtt_GetErrno() Get error code of last operation
141: inline int mqtt_GetErrno();
142: // mqtt_GetError() Get error text of last operation
143: inline const char *mqtt_GetError();
144: // -------------------------------------------------------
145:
146:
147: /*
148: * mqtt_msgAlloc() Allocate memory for MQTT Message
149: *
150: * @len = >0 Allocate buffer with length
151: * return: NULL error or Message, after use must call mqtt_msgFree() with all!=0
152: */
153: inline mqtt_msg_t *mqtt_msgAlloc(unsigned short len);
154: /*
155: * mqtt_msgFree() Free MQTT message
156: *
157: * @msg = Message buffer
158: * @all = !=0 Destroy entire message, if MQTT Message allocated with mqtt_msgAlloc()
159: * return: none
160: */
161: inline void mqtt_msgFree(mqtt_msg_t ** __restrict msg, int all);
162: /*
163: * mqtt_msgRealloc() Reallocate MQTT message buffer
164: *
165: * @msg = MQTT message
166: * @len = new length
167: * return: -1 error or >-1 old buffer length
168: */
169: inline int mqtt_msgRealloc(mqtt_msg_t * __restrict msg, unsigned short len);
170:
171: /*
172: * mqtt_encodeLen() Encode number to MQTT length field
173: *
174: * @num = number for encode
175: * return: -1 error or >-1 length
176: */
177: inline unsigned int mqtt_encodeLen(unsigned int num);
178: /*
179: * mqtt_decodeLen() Decode length from MQTT packet
180: *
181: * @len = length
182: * @n = sizeof bytes, if !=NULL
183: * return: -1 error, >-1 length of message
184: */
185: inline unsigned int mqtt_decodeLen(unsigned int len, char *n);
186: /*
187: * mqtt_sizeLen Return sizeof len field
188: *
189: * @len = length
190: * return: -1 error, >-1 sizeof len in bytes
191: */
192: inline char mqtt_sizeLen(unsigned int len);
193: /*
194: * mqtt_str2sub Create MQTT subscribe variable from string(s)
195: *
196: * @csStr = strings
197: * @strnum = number of strings elements
198: * @qoses = QoS elements applied to subscribe variable,
199: * count of elements must be equal with csStr elements
200: * return: NULL error or != subscribe variables array, must be free after use with mqtt_freeSub()
201: */
202: inline mqtt_subscr_t *mqtt_str2sub(const char **csStr, unsigned short strnum, unsigned char *qoses);
203: /*
204: * mqtt_subFree() Free array from subscribe variables
205: *
206: * @subs = Subscribe variables
207: * return: none
208: */
209: inline void mqtt_subFree(mqtt_subscr_t ** __restrict subs);
210: /*
211: * mqtt_subAlloc() Create array from subscribe variables
212: *
213: * @num = Number of elements
214: * return: NULL error or subscribe array, after use must call mqtt_subFree()
215: */
216: inline mqtt_subscr_t *mqtt_subAlloc(unsigned short num);
217:
218:
219: /*** SENDER FUNCTIONS ***/
220:
221: /*
222: * mqtt_msgCONNECT() Create CONNECT message
223: *
224: * @buf = Message buffer
225: * @csConnID = ConnectID
226: * @csUser = Username if !=NULL
227: * @csPass = Password for Username, only if csUser is set
228: * @csWillTopic = Will Topic if !=NULL Will Flags set into message
229: * @csWillMessage = Will Message, may be NULL
230: * @ClrSess = Clear Session subscriptions after disconnect
231: * @WillQOS = Will QOS if csWillTopic is set
232: * @WillRetain = Will Retain Will Message if csWillTopic is set
233: * return: -1 error or >-1 message size for send
234: */
235: int mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const char *csConnID,
236: const char *csUser, const char *csPass,
237: const char *csWillTopic, const char *csWillMessage,
238: unsigned char ClrSess, unsigned char WillQOS, unsigned char WillRetain);
239: /*
240: * mqtt_msgCONNACK() Create CONNACK message
241: *
242: * @buf = Message buffer
243: * @retcode = Return code
244: * return: -1 error or >-1 message size for send
245: */
246: int mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, unsigned char retcode);
247: /*
248: * mqtt_msgDISCONNECT() Create DISCONNECT message
249: *
250: * @buf = Message buffer
251: * return: -1 error or >-1 message size for send
252: */
253: int mqtt_msgDISCONNECT(mqtt_msg_t * __restrict buf);
254: /*
255: * mqtt_msgPINGREQ() Create PINGREQ message
256: *
257: * @buf = Message buffer
258: * return: -1 error or >-1 message size for send
259: */
260: int mqtt_msgPINGREQ(mqtt_msg_t * __restrict buf);
261: /*
262: * mqtt_msgPINGRESP() Create PINGRESP message
263: *
264: * @buf = Message buffer
265: * return: -1 error or >-1 message size for send
266: */
267: int mqtt_msgPINGRESP(mqtt_msg_t * __restrict buf);
268:
269: /*
270: * mqtt_msgPUBLISH() Create PUBLISH message
271: *
272: * @buf = Message buffer
273: * @csTopic = Publish topic
274: * @msgID = MessageID >0, if QOS != MQTT_QOS_ONCE
275: * @Dup = Duplicate message
276: * @QOS = QoS
277: * @Retain = Retain message
278: * @pData = Publish data into topic
279: * @datlen = Publish data length
280: * return: -1 error or >-1 message size for send
281: */
282: int mqtt_msgPUBLISH(mqtt_msg_t * __restrict buf, const char *csTopic, unsigned short msgID,
283: unsigned char Dup, unsigned char QOS, unsigned char Retain,
284: const void *pData, unsigned short datlen);
285: /*
286: * mqtt_msgPUBACK() Create PUBACK message
287: *
288: * @buf = Message buffer
289: * @msgID = MessageID
290: * return: -1 error or >-1 message size for send
291: */
292: inline int mqtt_msgPUBACK(mqtt_msg_t * __restrict buf, unsigned short msgID);
293: /*
294: * mqtt_msgPUBREC() Create PUBREC message
295: *
296: * @buf = Message buffer
297: * @msgID = MessageID
298: * return: -1 error or >-1 message size for send
299: */
300: inline int mqtt_msgPUBREC(mqtt_msg_t * __restrict buf, unsigned short msgID);
301: /*
302: * mqtt_msgPUBREL() Create PUBREL message
303: *
304: * @buf = Message buffer
305: * @msgID = MessageID
306: * return: -1 error or >-1 message size for send
307: */
308: inline int mqtt_msgPUBREL(mqtt_msg_t * __restrict buf, unsigned short msgID);
309: /*
310: * mqtt_msgPUBCOMP() Create PUBCOMP message
311: *
312: * @buf = Message buffer
313: * @msgID = MessageID
314: * return: -1 error or >-1 message size for send
315: */
316: inline int mqtt_msgPUBCOMP(mqtt_msg_t * __restrict buf, unsigned short msgID);
317:
318: /*
319: * mqtt_msgSUBSCRIBE() Create SUBSCRIBE message
320: *
321: * @buf = Message buffer
322: * @Topics = MQTT subscription topics
323: * @msgID = MessageID
324: * @Dup = Duplicate message
325: * @QOS = QoS
326: * return: -1 error or >-1 message size for send
327: */
328: int
329: mqtt_msgSUBSCRIBE(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
330: unsigned short msgID, unsigned char Dup, unsigned char QOS);
331: /*
332: * mqtt_msgSUBACK() Create SUBACK message
333: *
334: * @buf = Message buffer
335: * @Topics = MQTT subscription topics
336: * @msgID = MessageID
337: * return: -1 error or >-1 message size for send
338: */
339: int mqtt_msgSUBACK(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
340: unsigned short msgID);
341: /*
342: * mqtt_msgUNSUBSCRIBE() Create UNSUBSCRIBE message
343: *
344: * @buf = Message buffer
345: * @Topics = MQTT subscription topics
346: * @msgID = MessageID
347: * @Dup = Duplicate message
348: * @QOS = QoS
349: * return: -1 error or >-1 message size for send
350: */
351: int
352: mqtt_msgUNSUBSCRIBE(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
353: unsigned short msgID, unsigned char Dup, unsigned char QOS);
354: /*
355: * mqtt_msgUNSUBACK() Create UNSUBACK message
356: *
357: * @buf = Message buffer
358: * @msgID = MessageID
359: * return: -1 error or >-1 message size for send
360: */
361: int mqtt_msgUNSUBACK(mqtt_msg_t * __restrict buf, unsigned short msgID);
362:
363:
364: /*** RECEIVER FUNCTIONS ***/
365:
366: /*
367: * mqttInitCallbacks() Init callback array for dispatcher
368: *
369: * return: NULL error or !=NULL allocated callback array, after use free with mqttFiniCallbacks()
370: */
371: mqtt_cb_t *mqttInitCallbacks(void);
372: /*
373: * mqttFiniCallbacks() Free callback array
374: *
375: * @cb = Callback array
376: * return: none
377: */
378: void mqttFiniCallbacks(mqtt_cb_t ** __restrict cb);
379: /*
380: * MQTT_CALLBACK() Assign function to callback array for MQTT dispatcher
381: *
382: * @_cbs = Callback array
383: * @_x = MQTT Message type, like MQTT_TYPE_* ...
384: * @_func = Function
385: * return: none
386: */
387: #define MQTT_CALLBACK(_cbs, _x, _func) (assert((_cbs)), (_cbs)[(_x)] = (_func))
388: /*
389: * mqttDispatcher() MQTT Message type dispatcher
390: *
391: * @cb = Callback array
392: * @buf = Received MQTT message
393: * return: -1 error or >-1 return value from executed callback
394: */
395: inline int mqttDispatcher(mqtt_cb_t * __restrict cb, mqtt_msg_t * __restrict buf);
396:
397:
398: #endif
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