1.新增esp-idf设备端sdk

sdk/ESP-IDF/esp_fastbee_aliyun/esp-aliyun/iotkit-embedded/mqtt/MQTTSubscribeClient.c

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+/*
+ * Copyright (C) 2015-2018 Alibaba Group Holding Limited
+ */
+
+#include "MQTTPacket.h"
+
+#include <string.h>
+
+/**
+  * Determines the length of the MQTT subscribe packet that would be produced using the supplied parameters
+  * @param count the number of topic filter strings in topicFilters
+  * @param topicFilters the array of topic filter strings to be used in the publish
+  * @return the length of buffer needed to contain the serialized version of the packet
+  */
+int MQTTSerialize_subscribeLength(int count, MQTTString topicFilters[])
+{
+    int i;
+    int len = 2; /* packetid */
+
+    for (i = 0; i < count; ++i) {
+        len += 2 + MQTTstrlen(topicFilters[i]) + 1;    /* length + topic + req_qos */
+    }
+    return len;
+}
+
+
+/**
+  * Serializes the supplied subscribe data into the supplied buffer, ready for sending
+  * @param buf the buffer into which the packet will be serialized
+  * @param buflen the length in bytes of the supplied bufferr
+  * @param dup integer - the MQTT dup flag
+  * @param packetid integer - the MQTT packet identifier
+  * @param count - number of members in the topicFilters and reqQos arrays
+  * @param topicFilters - array of topic filter names
+  * @param requestedQoSs - array of requested QoS
+  * @return the length of the serialized data.  <= 0 indicates error
+  */
+int MQTTSerialize_subscribe(unsigned char *buf, int buflen, unsigned char dup, unsigned short packetid, int count,
+                            MQTTString topicFilters[], int requestedQoSs[])
+{
+    unsigned char *ptr = buf;
+    MQTTHeader header = {0};
+    int rem_len = 0;
+    int rc = 0;
+    int i = 0;
+
+    if (MQTTPacket_len(rem_len = MQTTSerialize_subscribeLength(count, topicFilters)) > buflen) {
+        rc = MQTTPACKET_BUFFER_TOO_SHORT;
+        goto exit;
+    }
+
+    header.byte = 0;
+    MQTT_HEADER_SET_TYPE(header.byte, SUBSCRIBE);
+    MQTT_HEADER_SET_DUP(header.byte, dup);
+    MQTT_HEADER_SET_QOS(header.byte, 1);
+    writeChar(&ptr, header.byte); /* write header */
+
+    ptr += MQTTPacket_encode(ptr, rem_len); /* write remaining length */;
+
+    writeInt(&ptr, packetid);
+
+    for (i = 0; i < count; ++i) {
+        writeMQTTString(&ptr, topicFilters[i]);
+        writeChar(&ptr, requestedQoSs[i]);
+    }
+
+    rc = ptr - buf;
+exit:
+    return rc;
+}
+
+
+
+/**
+  * Deserializes the supplied (wire) buffer into suback data
+  * @param packetid returned integer - the MQTT packet identifier
+  * @param maxcount - the maximum number of members allowed in the grantedQoSs array
+  * @param count returned integer - number of members in the grantedQoSs array
+  * @param grantedQoSs returned array of integers - the granted qualities of service
+  * @param buf the raw buffer data, of the correct length determined by the remaining length field
+  * @param buflen the length in bytes of the data in the supplied buffer
+  * @return error code.  1 is success, 0 is failure
+  */
+int MQTTDeserialize_suback(unsigned short *packetid, int maxcount, int *count, int grantedQoSs[], unsigned char *buf,
+                           int buflen)
+{
+    MQTTHeader header = {0};
+    unsigned char *curdata = buf;
+    unsigned char *enddata = NULL;
+    int rc = 0;
+    int mylen;
+
+    header.byte = readChar(&curdata);
+    if (MQTT_HEADER_GET_TYPE(header.byte) != SUBACK) {
+        goto exit;
+    }
+
+    curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
+    enddata = curdata + mylen;
+    if (enddata - curdata < 2) {
+        goto exit;
+    }
+
+    *packetid = readInt(&curdata);
+
+    *count = 0;
+    while (curdata < enddata) {
+        if (*count >= maxcount) {
+            rc = -1;
+            goto exit;
+        }
+        grantedQoSs[(*count)++] = readChar(&curdata);
+    }
+
+    rc = 1;
+exit:
+    return rc;
+}
+
+
+
+