Annotation of mqtt/src/sub.c, revision 1.1.2.5
1.1.2.1 misho 1: #include "global.h"
2:
3:
4: /* ------------------------------------------------------------------- */
5:
1.1.2.5 ! misho 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: */
1.1.2.2 misho 16: int
1.1.2.5 ! misho 17: mqtt_msgSUBSCRIBE(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics,
! 18: u_short msgID, u_char Dup, u_char QOS)
1.1.2.2 misho 19: {
1.1.2.3 misho 20: int siz = 0;
21: struct mqtthdr *hdr;
22: mqtthdr_var_t *topic;
23: mqtt_v_t *mid;
1.1.2.5 ! misho 24: mqtt_subscr_t *t;
! 25: u_char *qos;
1.1.2.3 misho 26:
1.1.2.5 ! misho 27: if (!buf || !Topics)
1.1.2.3 misho 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:
1.1.2.4 misho 47: mid = (mqtt_v_t*) (buf->msg_base + siz);
48: mid->val = htons(msgID);
49: siz += sizeof(mqtt_v_t);
50:
1.1.2.5 ! misho 51: /* payload with subscriptions */
! 52:
! 53: for (t = Topics; t && t->sub_data; t++) {
! 54: topic = (mqtthdr_var_t*) (buf->msg_base + siz);
! 55: topic->var_sb.val = t->sub_sb.val;
! 56: memcpy(topic->var_data, t->sub_data, ntohs(topic->var_sb.val));
! 57: siz += MQTTHDR_VAR_SIZEOF(topic);
! 58: qos = (buf->msg_base + siz);
! 59: *qos = t->sub_qos;
! 60: siz++;
! 61: }
1.1.2.3 misho 62:
63: /* fixed header */
64:
1.1.2.4 misho 65: hdr->mqtt_msg.type = MQTT_TYPE_SUBSCRIBE;
1.1.2.3 misho 66: hdr->mqtt_msg.qos = QOS;
67: hdr->mqtt_msg.dup = Dup ? 1 : 0;
1.1.2.4 misho 68: hdr->mqtt_msg.retain = 0;
1.1.2.3 misho 69: *hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr));
70:
71: mqtt_msgRealloc(buf, siz);
72: return siz;
1.1.2.2 misho 73: }
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