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: * @len = >0 Allocate buffer with length
147: * return: NULL error or Message, after use must call mqtt_msgFree() with all!=0
148: */
149: inline mqtt_msg_t *mqtt_msgAlloc(unsigned short len);
150: /*
151: * mqtt_msgFree() Free MQTT message
152: * @msg = Message buffer
153: * @all = !=0 Destroy entire message, if MQTT Message allocated with mqtt_msgAlloc()
154: * return: none
155: */
156: inline void mqtt_msgFree(mqtt_msg_t ** __restrict msg, int all);
157: /*
158: * mqtt_msgRealloc() Reallocate MQTT message buffer
159: * @msg = MQTT message
160: * @len = new length
161: * return: -1 error or >-1 old buffer length
162: */
163: inline int mqtt_msgRealloc(mqtt_msg_t * __restrict msg, unsigned short len);
164:
165: /*
166: * mqtt_encodeLen() Encode number to MQTT length field
167: * @num = number for encode
168: * return: -1 error or >-1 length
169: */
170: inline unsigned int mqtt_encodeLen(unsigned int num);
171: /*
172: * mqtt_decodeLen() Decode length from MQTT packet
173: * @len = length
174: * @n = sizeof bytes, if !=NULL
175: * return: -1 error, >-1 length of message
176: */
177: inline unsigned int mqtt_decodeLen(unsigned int len, char *n);
178: /*
179: * mqtt_sizeLen Return sizeof len field
180: * @len = length
181: * return: -1 error, >-1 sizeof len in bytes
182: */
183: inline char mqtt_sizeLen(unsigned int len);
184: /*
185: * mqtt_str2sub Create MQTT subscribe variable from string(s)
186: * @csStr = strings
187: * @strnum = number of strings elements
188: * @qoses = QoS elements applied to subscribe variable,
189: * count of elements must be equal with csStr elements
190: * return: NULL error or != subscribe variables array, must be free after use with mqtt_freeSub()
191: */
192: inline mqtt_subscr_t *mqtt_str2sub(const char **csStr, unsigned short strnum, unsigned char *qoses);
193: /*
194: * mqtt_freeSub() Free array from subscribe variables
195: *
196: * @subs = Subscribe variables
197: * return: none
198: */
199: inline void mqtt_freeSub(mqtt_subscr_t ** __restrict subs);
200:
201: /*
202: * mqtt_msgCONNECT() Create CONNECT message
203: *
204: * @buf = Message buffer
205: * @csConnID = ConnectID
206: * @csUser = Username if !=NULL
207: * @csPass = Password for Username, only if csUser is set
208: * @csWillTopic = Will Topic if !=NULL Will Flags set into message
209: * @csWillMessage = Will Message, may be NULL
210: * @ClrSess = Clear Session subscriptions after disconnect
211: * @WillQOS = Will QOS if csWillTopic is set
212: * @WillRetain = Will Retain Will Message if csWillTopic is set
213: * return: -1 error or >-1 message size for send
214: */
215: int mqtt_msgCONNECT(mqtt_msg_t * __restrict buf, const char *csConnID,
216: const char *csUser, const char *csPass,
217: const char *csWillTopic, const char *csWillMessage,
218: unsigned char ClrSess, unsigned char WillQOS, unsigned char WillRetain);
219: /*
220: * mqtt_msgCONNACK() Create CONNACK message
221: *
222: * @buf = Message buffer
223: * @retcode = Return code
224: * return: -1 error or >-1 message size for send
225: */
226: int mqtt_msgCONNACK(mqtt_msg_t * __restrict buf, unsigned char retcode);
227: /*
228: * mqtt_msgPUBLISH() Create PUBLISH message
229: *
230: * @buf = Message buffer
231: * @csTopic = Publish topic
232: * @msgID = MessageID >0, if QOS != MQTT_QOS_ONCE
233: * @Dup = Duplicate message
234: * @QOS = QoS
235: * @Retain = Retain message
236: * @pData = Publish data into topic
237: * @datlen = Publish data length
238: * return: -1 error or >-1 message size for send
239: */
240: int mqtt_msgPUBLISH(mqtt_msg_t * __restrict buf, const char *csTopic, unsigned short msgID,
241: unsigned char Dup, unsigned char QOS, unsigned char Retain,
242: const void *pData, unsigned short datlen);
243: /*
244: * mqtt_msgPUBACK() Create PUBACK message
245: *
246: * @buf = Message buffer
247: * @msgID = MessageID
248: * return: -1 error or >-1 message size for send
249: */
250: inline int mqtt_msgPUBACK(mqtt_msg_t * __restrict buf, unsigned short msgID);
251: /*
252: * mqtt_msgPUBREC() Create PUBREC message
253: *
254: * @buf = Message buffer
255: * @msgID = MessageID
256: * return: -1 error or >-1 message size for send
257: */
258: inline int mqtt_msgPUBREC(mqtt_msg_t * __restrict buf, unsigned short msgID);
259: /*
260: * mqtt_msgPUBREL() Create PUBREL message
261: *
262: * @buf = Message buffer
263: * @msgID = MessageID
264: * return: -1 error or >-1 message size for send
265: */
266: inline int mqtt_msgPUBREL(mqtt_msg_t * __restrict buf, unsigned short msgID);
267: /*
268: * mqtt_msgPUBCOMP() Create PUBCOMP message
269: *
270: * @buf = Message buffer
271: * @msgID = MessageID
272: * return: -1 error or >-1 message size for send
273: */
274: inline int mqtt_msgPUBCOMP(mqtt_msg_t * __restrict buf, unsigned short msgID);
275:
276:
277: #endif
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