version 1.1.2.2, 2011/11/21 15:07:12
|
version 1.1.2.5, 2011/11/22 10:33:39
|
Line 3
|
Line 3
|
|
|
/* ------------------------------------------------------------------- */ |
/* ------------------------------------------------------------------- */ |
|
|
|
/* |
|
* mqtt_msgSUBSCRIBE() Create SUBSCRIBE message |
|
* |
|
* @buf = Message buffer |
|
* @Topics = MQTT subscription topics |
|
* @msgID = MessageID |
|
* @Dup = Duplicate message |
|
* @QOS = QoS |
|
* return: -1 error or >-1 message size for send |
|
*/ |
int |
int |
mqtt_msgSUBSCRIBE(mqtt_msg_t * __restrict buf, const char *csTopic, u_short msgID, | mqtt_msgSUBSCRIBE(mqtt_msg_t * __restrict buf, mqtt_subscr_t * __restrict Topics, |
) | u_short msgID, u_char Dup, u_char QOS) |
{ |
{ |
|
int siz = 0; |
|
struct mqtthdr *hdr; |
|
mqtthdr_var_t *topic; |
|
mqtt_v_t *mid; |
|
mqtt_subscr_t *t; |
|
u_char *qos; |
|
|
|
if (!buf || !Topics) |
|
return -1; |
|
if (QOS > MQTT_QOS_EXACTLY) { |
|
mqtt_SetErr(EINVAL, "Error:: invalid QoS parameter"); |
|
return -1; |
|
} |
|
if (!msgID && QOS != MQTT_QOS_ONCE) { |
|
mqtt_SetErr(EINVAL, "Error:: invalid MessageID parameter must be >0"); |
|
return -1; |
|
} |
|
|
|
if (mqtt_msgRealloc(buf, MQTTMSG_MAX) == -1) |
|
return -1; |
|
else { |
|
hdr = (struct mqtthdr *) (buf->msg_base + siz); |
|
siz += sizeof(struct mqtthdr); |
|
} |
|
|
|
/* variable header */ |
|
|
|
mid = (mqtt_v_t*) (buf->msg_base + siz); |
|
mid->val = htons(msgID); |
|
siz += sizeof(mqtt_v_t); |
|
|
|
/* payload with subscriptions */ |
|
|
|
for (t = Topics; t && t->sub_data; t++) { |
|
topic = (mqtthdr_var_t*) (buf->msg_base + siz); |
|
topic->var_sb.val = t->sub_sb.val; |
|
memcpy(topic->var_data, t->sub_data, ntohs(topic->var_sb.val)); |
|
siz += MQTTHDR_VAR_SIZEOF(topic); |
|
qos = (buf->msg_base + siz); |
|
*qos = t->sub_qos; |
|
siz++; |
|
} |
|
|
|
/* fixed header */ |
|
|
|
hdr->mqtt_msg.type = MQTT_TYPE_SUBSCRIBE; |
|
hdr->mqtt_msg.qos = QOS; |
|
hdr->mqtt_msg.dup = Dup ? 1 : 0; |
|
hdr->mqtt_msg.retain = 0; |
|
*hdr->mqtt_len = mqtt_encodeLen(siz - sizeof(struct mqtthdr)); |
|
|
|
mqtt_msgRealloc(buf, siz); |
|
return siz; |
} |
} |