Vergil Cola / Mbed OS MQTTGatewayK64

Fork of my MQTTGateway

Dependencies:   mbed-http

MQTTSManager/MQTTPacket/MQTTSubscribeClient.c@0:f1d3878b8dd9, 2017-04-08 (annotated)

Committer:
vpcola
Date:
Sat Apr 08 14:45:51 2017 +0000
Revision:
0:f1d3878b8dd9
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vpcola 0:f1d3878b8dd9 1 /*******************************************************************************
vpcola 0:f1d3878b8dd9 2 * Copyright (c) 2014 IBM Corp.
vpcola 0:f1d3878b8dd9 3 *
vpcola 0:f1d3878b8dd9 4 * All rights reserved. This program and the accompanying materials
vpcola 0:f1d3878b8dd9 5 * are made available under the terms of the Eclipse Public License v1.0
vpcola 0:f1d3878b8dd9 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
vpcola 0:f1d3878b8dd9 7 *
vpcola 0:f1d3878b8dd9 8 * The Eclipse Public License is available at
vpcola 0:f1d3878b8dd9 9 * http://www.eclipse.org/legal/epl-v10.html
vpcola 0:f1d3878b8dd9 10 * and the Eclipse Distribution License is available at
vpcola 0:f1d3878b8dd9 11 * http://www.eclipse.org/org/documents/edl-v10.php.
vpcola 0:f1d3878b8dd9 12 *
vpcola 0:f1d3878b8dd9 13 * Contributors:
vpcola 0:f1d3878b8dd9 14 * Ian Craggs - initial API and implementation and/or initial documentation
vpcola 0:f1d3878b8dd9 15 *******************************************************************************/
vpcola 0:f1d3878b8dd9 16
vpcola 0:f1d3878b8dd9 17 #include "MQTTPacket.h"
vpcola 0:f1d3878b8dd9 18 #include "StackTrace.h"
vpcola 0:f1d3878b8dd9 19
vpcola 0:f1d3878b8dd9 20 #include <string.h>
vpcola 0:f1d3878b8dd9 21
vpcola 0:f1d3878b8dd9 22 /**
vpcola 0:f1d3878b8dd9 23 * Determines the length of the MQTT subscribe packet that would be produced using the supplied parameters
vpcola 0:f1d3878b8dd9 24 * @param count the number of topic filter strings in topicFilters
vpcola 0:f1d3878b8dd9 25 * @param topicFilters the array of topic filter strings to be used in the publish
vpcola 0:f1d3878b8dd9 26 * @return the length of buffer needed to contain the serialized version of the packet
vpcola 0:f1d3878b8dd9 27 */
vpcola 0:f1d3878b8dd9 28 int MQTTSerialize_subscribeLength(int count, MQTTString topicFilters[])
vpcola 0:f1d3878b8dd9 29 {
vpcola 0:f1d3878b8dd9 30 int i;
vpcola 0:f1d3878b8dd9 31 int len = 2; /* packetid */
vpcola 0:f1d3878b8dd9 32
vpcola 0:f1d3878b8dd9 33 for (i = 0; i < count; ++i)
vpcola 0:f1d3878b8dd9 34 len += 2 + MQTTstrlen(topicFilters[i]) + 1; /* length + topic + req_qos */
vpcola 0:f1d3878b8dd9 35 return len;
vpcola 0:f1d3878b8dd9 36 }
vpcola 0:f1d3878b8dd9 37
vpcola 0:f1d3878b8dd9 38
vpcola 0:f1d3878b8dd9 39 /**
vpcola 0:f1d3878b8dd9 40 * Serializes the supplied subscribe data into the supplied buffer, ready for sending
vpcola 0:f1d3878b8dd9 41 * @param buf the buffer into which the packet will be serialized
vpcola 0:f1d3878b8dd9 42 * @param buflen the length in bytes of the supplied bufferr
vpcola 0:f1d3878b8dd9 43 * @param dup integer - the MQTT dup flag
vpcola 0:f1d3878b8dd9 44 * @param packetid integer - the MQTT packet identifier
vpcola 0:f1d3878b8dd9 45 * @param count - number of members in the topicFilters and reqQos arrays
vpcola 0:f1d3878b8dd9 46 * @param topicFilters - array of topic filter names
vpcola 0:f1d3878b8dd9 47 * @param requestedQoSs - array of requested QoS
vpcola 0:f1d3878b8dd9 48 * @return the length of the serialized data. <= 0 indicates error
vpcola 0:f1d3878b8dd9 49 */
vpcola 0:f1d3878b8dd9 50 int MQTTSerialize_subscribe(unsigned char* buf, int buflen, unsigned char dup, unsigned short packetid, int count,
vpcola 0:f1d3878b8dd9 51 MQTTString topicFilters[], int requestedQoSs[])
vpcola 0:f1d3878b8dd9 52 {
vpcola 0:f1d3878b8dd9 53 unsigned char *ptr = buf;
vpcola 0:f1d3878b8dd9 54 MQTTHeader header = {0};
vpcola 0:f1d3878b8dd9 55 int rem_len = 0;
vpcola 0:f1d3878b8dd9 56 int rc = 0;
vpcola 0:f1d3878b8dd9 57 int i = 0;
vpcola 0:f1d3878b8dd9 58
vpcola 0:f1d3878b8dd9 59 FUNC_ENTRY;
vpcola 0:f1d3878b8dd9 60 if (MQTTPacket_len(rem_len = MQTTSerialize_subscribeLength(count, topicFilters)) > buflen)
vpcola 0:f1d3878b8dd9 61 {
vpcola 0:f1d3878b8dd9 62 rc = MQTTPACKET_BUFFER_TOO_SHORT;
vpcola 0:f1d3878b8dd9 63 goto exit;
vpcola 0:f1d3878b8dd9 64 }
vpcola 0:f1d3878b8dd9 65
vpcola 0:f1d3878b8dd9 66 header.byte = 0;
vpcola 0:f1d3878b8dd9 67 header.bits.type = SUBSCRIBE;
vpcola 0:f1d3878b8dd9 68 header.bits.dup = dup;
vpcola 0:f1d3878b8dd9 69 header.bits.qos = 1;
vpcola 0:f1d3878b8dd9 70 writeChar(&ptr, header.byte); /* write header */
vpcola 0:f1d3878b8dd9 71
vpcola 0:f1d3878b8dd9 72 ptr += MQTTPacket_encode(ptr, rem_len); /* write remaining length */;
vpcola 0:f1d3878b8dd9 73
vpcola 0:f1d3878b8dd9 74 writeInt(&ptr, packetid);
vpcola 0:f1d3878b8dd9 75
vpcola 0:f1d3878b8dd9 76 for (i = 0; i < count; ++i)
vpcola 0:f1d3878b8dd9 77 {
vpcola 0:f1d3878b8dd9 78 writeMQTTString(&ptr, topicFilters[i]);
vpcola 0:f1d3878b8dd9 79 writeChar(&ptr, requestedQoSs[i]);
vpcola 0:f1d3878b8dd9 80 }
vpcola 0:f1d3878b8dd9 81
vpcola 0:f1d3878b8dd9 82 rc = ptr - buf;
vpcola 0:f1d3878b8dd9 83 exit:
vpcola 0:f1d3878b8dd9 84 FUNC_EXIT_RC(rc);
vpcola 0:f1d3878b8dd9 85 return rc;
vpcola 0:f1d3878b8dd9 86 }
vpcola 0:f1d3878b8dd9 87
vpcola 0:f1d3878b8dd9 88
vpcola 0:f1d3878b8dd9 89
vpcola 0:f1d3878b8dd9 90 /**
vpcola 0:f1d3878b8dd9 91 * Deserializes the supplied (wire) buffer into suback data
vpcola 0:f1d3878b8dd9 92 * @param packetid returned integer - the MQTT packet identifier
vpcola 0:f1d3878b8dd9 93 * @param maxcount - the maximum number of members allowed in the grantedQoSs array
vpcola 0:f1d3878b8dd9 94 * @param count returned integer - number of members in the grantedQoSs array
vpcola 0:f1d3878b8dd9 95 * @param grantedQoSs returned array of integers - the granted qualities of service
vpcola 0:f1d3878b8dd9 96 * @param buf the raw buffer data, of the correct length determined by the remaining length field
vpcola 0:f1d3878b8dd9 97 * @param buflen the length in bytes of the data in the supplied buffer
vpcola 0:f1d3878b8dd9 98 * @return error code. 1 is success, 0 is failure
vpcola 0:f1d3878b8dd9 99 */
vpcola 0:f1d3878b8dd9 100 int MQTTDeserialize_suback(unsigned short* packetid, int maxcount, int* count, int grantedQoSs[], unsigned char* buf, int buflen)
vpcola 0:f1d3878b8dd9 101 {
vpcola 0:f1d3878b8dd9 102 MQTTHeader header = {0};
vpcola 0:f1d3878b8dd9 103 unsigned char* curdata = buf;
vpcola 0:f1d3878b8dd9 104 unsigned char* enddata = NULL;
vpcola 0:f1d3878b8dd9 105 int rc = 0;
vpcola 0:f1d3878b8dd9 106 int mylen;
vpcola 0:f1d3878b8dd9 107
vpcola 0:f1d3878b8dd9 108 FUNC_ENTRY;
vpcola 0:f1d3878b8dd9 109 header.byte = readChar(&curdata);
vpcola 0:f1d3878b8dd9 110 if (header.bits.type != SUBACK)
vpcola 0:f1d3878b8dd9 111 goto exit;
vpcola 0:f1d3878b8dd9 112
vpcola 0:f1d3878b8dd9 113 curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
vpcola 0:f1d3878b8dd9 114 enddata = curdata + mylen;
vpcola 0:f1d3878b8dd9 115 if (enddata - curdata < 2)
vpcola 0:f1d3878b8dd9 116 goto exit;
vpcola 0:f1d3878b8dd9 117
vpcola 0:f1d3878b8dd9 118 *packetid = readInt(&curdata);
vpcola 0:f1d3878b8dd9 119
vpcola 0:f1d3878b8dd9 120 *count = 0;
vpcola 0:f1d3878b8dd9 121 while (curdata < enddata)
vpcola 0:f1d3878b8dd9 122 {
vpcola 0:f1d3878b8dd9 123 if (*count > maxcount)
vpcola 0:f1d3878b8dd9 124 {
vpcola 0:f1d3878b8dd9 125 rc = -1;
vpcola 0:f1d3878b8dd9 126 goto exit;
vpcola 0:f1d3878b8dd9 127 }
vpcola 0:f1d3878b8dd9 128 grantedQoSs[(*count)++] = readChar(&curdata);
vpcola 0:f1d3878b8dd9 129 }
vpcola 0:f1d3878b8dd9 130
vpcola 0:f1d3878b8dd9 131 rc = 1;
vpcola 0:f1d3878b8dd9 132 exit:
vpcola 0:f1d3878b8dd9 133 FUNC_EXIT_RC(rc);
vpcola 0:f1d3878b8dd9 134 return rc;
vpcola 0:f1d3878b8dd9 135 }
vpcola 0:f1d3878b8dd9 136
vpcola 0:f1d3878b8dd9 137