Vergil Cola / Mbed OS MQTTGatewayK64

Fork of my MQTTGateway

Dependencies:   mbed-http

MQTTSManager/MQTTPacket/MQTTUnsubscribeClient.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 unsubscribe 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_unsubscribeLength(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]); /* length + topic*/
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 unsubscribe data into the supplied buffer, ready for sending
vpcola 0:f1d3878b8dd9 41 * @param buf the raw buffer data, of the correct length determined by the remaining length field
vpcola 0:f1d3878b8dd9 42 * @param buflen the length in bytes of the data in the supplied buffer
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 array
vpcola 0:f1d3878b8dd9 46 * @param topicFilters - array of topic filter names
vpcola 0:f1d3878b8dd9 47 * @return the length of the serialized data. <= 0 indicates error
vpcola 0:f1d3878b8dd9 48 */
vpcola 0:f1d3878b8dd9 49 int MQTTSerialize_unsubscribe(unsigned char* buf, int buflen, unsigned char dup, unsigned short packetid,
vpcola 0:f1d3878b8dd9 50 int count, MQTTString topicFilters[])
vpcola 0:f1d3878b8dd9 51 {
vpcola 0:f1d3878b8dd9 52 unsigned char *ptr = buf;
vpcola 0:f1d3878b8dd9 53 MQTTHeader header = {0};
vpcola 0:f1d3878b8dd9 54 int rem_len = 0;
vpcola 0:f1d3878b8dd9 55 int rc = -1;
vpcola 0:f1d3878b8dd9 56 int i = 0;
vpcola 0:f1d3878b8dd9 57
vpcola 0:f1d3878b8dd9 58 FUNC_ENTRY;
vpcola 0:f1d3878b8dd9 59 if (MQTTPacket_len(rem_len = MQTTSerialize_unsubscribeLength(count, topicFilters)) > buflen)
vpcola 0:f1d3878b8dd9 60 {
vpcola 0:f1d3878b8dd9 61 rc = MQTTPACKET_BUFFER_TOO_SHORT;
vpcola 0:f1d3878b8dd9 62 goto exit;
vpcola 0:f1d3878b8dd9 63 }
vpcola 0:f1d3878b8dd9 64
vpcola 0:f1d3878b8dd9 65 header.byte = 0;
vpcola 0:f1d3878b8dd9 66 header.bits.type = UNSUBSCRIBE;
vpcola 0:f1d3878b8dd9 67 header.bits.dup = dup;
vpcola 0:f1d3878b8dd9 68 header.bits.qos = 1;
vpcola 0:f1d3878b8dd9 69 writeChar(&ptr, header.byte); /* write header */
vpcola 0:f1d3878b8dd9 70
vpcola 0:f1d3878b8dd9 71 ptr += MQTTPacket_encode(ptr, rem_len); /* write remaining length */;
vpcola 0:f1d3878b8dd9 72
vpcola 0:f1d3878b8dd9 73 writeInt(&ptr, packetid);
vpcola 0:f1d3878b8dd9 74
vpcola 0:f1d3878b8dd9 75 for (i = 0; i < count; ++i)
vpcola 0:f1d3878b8dd9 76 writeMQTTString(&ptr, topicFilters[i]);
vpcola 0:f1d3878b8dd9 77
vpcola 0:f1d3878b8dd9 78 rc = ptr - buf;
vpcola 0:f1d3878b8dd9 79 exit:
vpcola 0:f1d3878b8dd9 80 FUNC_EXIT_RC(rc);
vpcola 0:f1d3878b8dd9 81 return rc;
vpcola 0:f1d3878b8dd9 82 }
vpcola 0:f1d3878b8dd9 83
vpcola 0:f1d3878b8dd9 84
vpcola 0:f1d3878b8dd9 85 /**
vpcola 0:f1d3878b8dd9 86 * Deserializes the supplied (wire) buffer into unsuback data
vpcola 0:f1d3878b8dd9 87 * @param packetid returned integer - the MQTT packet identifier
vpcola 0:f1d3878b8dd9 88 * @param buf the raw buffer data, of the correct length determined by the remaining length field
vpcola 0:f1d3878b8dd9 89 * @param buflen the length in bytes of the data in the supplied buffer
vpcola 0:f1d3878b8dd9 90 * @return error code. 1 is success, 0 is failure
vpcola 0:f1d3878b8dd9 91 */
vpcola 0:f1d3878b8dd9 92 int MQTTDeserialize_unsuback(unsigned short* packetid, unsigned char* buf, int buflen)
vpcola 0:f1d3878b8dd9 93 {
vpcola 0:f1d3878b8dd9 94 unsigned char type = 0;
vpcola 0:f1d3878b8dd9 95 unsigned char dup = 0;
vpcola 0:f1d3878b8dd9 96 int rc = 0;
vpcola 0:f1d3878b8dd9 97
vpcola 0:f1d3878b8dd9 98 FUNC_ENTRY;
vpcola 0:f1d3878b8dd9 99 rc = MQTTDeserialize_ack(&type, &dup, packetid, buf, buflen);
vpcola 0:f1d3878b8dd9 100 if (type == UNSUBACK)
vpcola 0:f1d3878b8dd9 101 rc = 1;
vpcola 0:f1d3878b8dd9 102 FUNC_EXIT_RC(rc);
vpcola 0:f1d3878b8dd9 103 return rc;
vpcola 0:f1d3878b8dd9 104 }
vpcola 0:f1d3878b8dd9 105
vpcola 0:f1d3878b8dd9 106