1: #include "global.h"
2:
3:
4: /* ------------------------------------------------------------------- */
5:
6: /*
7: * mqtt_msgSUBSCRIBE() Create SUBSCRIBE message
8: *
9: * @buf = Message buffer
10: * @Topics = MQTT subscription topics
11: * @msgID = MessageID
12: * @Dup = Duplicate message
13: * @QOS = QoS
14: * return: -1 error or >-1 message size for send
15: */
16: int
17: mqtt_msgSUBSCRIBE(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
18: u_short msgID, u_char Dup, u_char QOS)
19: {
20: int siz = 0;
21: struct mqtthdr *hdr;
22: mqtthdr_var_t *topic;
23: mqtt_v_t *mid;
24: mqtt_subscr_t *t;
25: u_char *qos;
26:
27: if (!buf || !Topics)
28: return -1;
29: if (QOS > MQTT_QOS_EXACTLY) {
30: mqtt_SetErr(EINVAL, "Error:: invalid QoS parameter");
31: return -1;
32: }
33: if (!msgID && QOS != MQTT_QOS_ONCE) {
34: mqtt_SetErr(EINVAL, "Error:: invalid MessageID parameter must be >0");
35: return -1;
36: }
37:
38: if (mqtt_msgRealloc(buf, MQTTMSG_MAX) == -1)
39: return -1;
40: else {
41: hdr = (struct mqtthdr *) (buf->msg_base + siz);
42: siz += sizeof(struct mqtthdr);
43: }
44:
45: /* variable header */
46: mid = (mqtt_v_t*) (buf->msg_base + siz);
47: mid->val = htons(msgID);
48: siz += sizeof(mqtt_v_t);
49:
50: /* payload with subscriptions */
51: for (t = Topics; t && t->sub_data; t++) {
52: topic = (mqtthdr_var_t*) (buf->msg_base + siz);
53: topic->var_sb.val = t->sub_sb.val;
54: memcpy(topic->var_data, t->sub_data, ntohs(topic->var_sb.val));
55: siz += MQTTHDR_VAR_SIZEOF(topic);
56: qos = (buf->msg_base + siz);
57: *qos = t->sub_qos;
58: siz++;
59: }
60:
61: /* fixed header */
62: MQTTHDR_MSGINIT(hdr);
63: hdr->mqtt_msg.type = MQTT_TYPE_SUBSCRIBE;
64: hdr->mqtt_msg.qos = QOS;
65: hdr->mqtt_msg.dup = Dup ? 1 : 0;
66: hdr->mqtt_msg.retain = 0;
67: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
68:
69: mqtt_msgRealloc(buf, siz);
70: return siz;
71: }
72:
73: /*
74: * mqtt_msgSUBACK() Create SUBACK message
75: *
76: * @buf = Message buffer
77: * @Topics = MQTT subscription topics
78: * @msgID = MessageID
79: * return: -1 error or >-1 message size for send
80: */
81: int
82: mqtt_msgSUBACK(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics, u_short msgID)
83: {
84: int siz = 0;
85: struct mqtthdr *hdr;
86: mqtt_v_t *v;
87: mqtt_subscr_t *t;
88: u_char *qos;
89:
90: if (!buf || !Topics)
91: return -1;
92:
93: if (mqtt_msgRealloc(buf, MQTTMSG_MAX) == -1)
94: return -1;
95: else {
96: hdr = (struct mqtthdr *) (buf->msg_base + siz);
97: siz += sizeof(struct mqtthdr);
98: v = (mqtt_v_t*) (buf->msg_base + siz);
99: siz += sizeof(mqtt_v_t);
100: }
101:
102: /* MessageID */
103: v->val = htons(msgID);
104:
105: /* QoS payload from subscriptions */
106: for (t = Topics; t && t->sub_data; t++) {
107: qos = (buf->msg_base + siz);
108: *qos = t->sub_qos;
109: siz++;
110: }
111:
112: /* fixed header */
113: MQTTHDR_MSGINIT(hdr);
114: hdr->mqtt_msg.type = MQTT_TYPE_SUBACK;
115: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
116:
117: mqtt_msgRealloc(buf, siz);
118: return siz;
119: }
120:
121: /*
122: * mqtt_msgUNSUBSCRIBE() Create UNSUBSCRIBE message
123: *
124: * @buf = Message buffer
125: * @Topics = MQTT subscription topics
126: * @msgID = MessageID
127: * @Dup = Duplicate message
128: * @QOS = QoS
129: * return: -1 error or >-1 message size for send
130: */
131: int
132: mqtt_msgUNSUBSCRIBE(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
133: u_short msgID, u_char Dup, u_char QOS)
134: {
135: int siz = 0;
136: struct mqtthdr *hdr;
137: mqtthdr_var_t *topic;
138: mqtt_v_t *mid;
139: mqtt_subscr_t *t;
140:
141: if (!buf || !Topics)
142: return -1;
143: if (QOS > MQTT_QOS_EXACTLY) {
144: mqtt_SetErr(EINVAL, "Error:: invalid QoS parameter");
145: return -1;
146: }
147: if (!msgID && QOS != MQTT_QOS_ONCE) {
148: mqtt_SetErr(EINVAL, "Error:: invalid MessageID parameter must be >0");
149: return -1;
150: }
151:
152: if (mqtt_msgRealloc(buf, MQTTMSG_MAX) == -1)
153: return -1;
154: else {
155: hdr = (struct mqtthdr *) (buf->msg_base + siz);
156: siz += sizeof(struct mqtthdr);
157: }
158:
159: /* variable header */
160: mid = (mqtt_v_t*) (buf->msg_base + siz);
161: mid->val = htons(msgID);
162: siz += sizeof(mqtt_v_t);
163:
164: /* payload with subscriptions */
165: for (t = Topics; t && t->sub_data; t++) {
166: topic = (mqtthdr_var_t*) (buf->msg_base + siz);
167: topic->var_sb.val = t->sub_sb.val;
168: memcpy(topic->var_data, t->sub_data, ntohs(topic->var_sb.val));
169: siz += MQTTHDR_VAR_SIZEOF(topic);
170: }
171:
172: /* fixed header */
173: MQTTHDR_MSGINIT(hdr);
174: hdr->mqtt_msg.type = MQTT_TYPE_UNSUBSCRIBE;
175: hdr->mqtt_msg.qos = QOS;
176: hdr->mqtt_msg.dup = Dup ? 1 : 0;
177: hdr->mqtt_msg.retain = 0;
178: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
179:
180: mqtt_msgRealloc(buf, siz);
181: return siz;
182: }
183:
184: /*
185: * mqtt_msgUNSUBACK() Create UNSUBACK message
186: *
187: * @buf = Message buffer
188: * @msgID = MessageID
189: * return: -1 error or >-1 message size for send
190: */
191: int
192: mqtt_msgUNSUBACK(mqtt_msg_t * __restrict buf, u_short msgID)
193: {
194: int siz = 0;
195: struct mqtthdr *hdr;
196: mqtt_v_t *v;
197:
198: if (!buf)
199: return -1;
200:
201: if (mqtt_msgRealloc(buf, sizeof(struct mqtthdr) + sizeof(mqtt_v_t)) == -1)
202: return -1;
203: else {
204: hdr = (struct mqtthdr *) (buf->msg_base + siz);
205: siz += sizeof(struct mqtthdr);
206: v = (mqtt_v_t*) (buf->msg_base + siz);
207: siz += sizeof(mqtt_v_t);
208: }
209:
210: /* fixed header */
211: MQTTHDR_MSGINIT(hdr);
212: hdr->mqtt_msg.type = MQTT_TYPE_UNSUBACK;
213: *hdr->mqtt_len = sizeof(mqtt_v_t);
214:
215: /* MessageID */
216: v->val = htons(msgID);
217:
218: return siz;
219: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/cvsweb/back.gif){kind=icon}
Return to sub.c CVS log ![[TXT]](/icons/cvsweb/text.gif){kind=icon}
![[DIR]](/icons/cvsweb/dir.gif){kind=icon}
Up to [ELWIX - Embedded LightWeight unIX -] / mqtt / src