IBM Watson IoT / Mbed OS IBMIoTClientEthernetExample

Contains example code to connect the mbed LPC1768 or FRDM-K64F devices to the IBM Internet of Things Cloud service via ethernet.

Dependencies:   C12832 MQTT LM75B MMA7660

Dependents:   MFT_IoT_demo_USB400 IBM_RFID

MQTT/MQTTPacket/MQTTUnsubscribeServer.c@6:37b6d0d56190, 2014-08-20 (annotated)

Committer:
samdanbury
Date:
Wed Aug 20 12:45:14 2014 +0000
Revision:
6:37b6d0d56190
Code completely changed to improve the structure, flow and memory usage of the application

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samdanbury 6:37b6d0d56190 1 /*******************************************************************************
samdanbury 6:37b6d0d56190 2 * Copyright (c) 2014 IBM Corp.
samdanbury 6:37b6d0d56190 3 *
samdanbury 6:37b6d0d56190 4 * All rights reserved. This program and the accompanying materials
samdanbury 6:37b6d0d56190 5 * are made available under the terms of the Eclipse Public License v1.0
samdanbury 6:37b6d0d56190 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
samdanbury 6:37b6d0d56190 7 *
samdanbury 6:37b6d0d56190 8 * The Eclipse Public License is available at
samdanbury 6:37b6d0d56190 9 * http://www.eclipse.org/legal/epl-v10.html
samdanbury 6:37b6d0d56190 10 * and the Eclipse Distribution License is available at
samdanbury 6:37b6d0d56190 11 * http://www.eclipse.org/org/documents/edl-v10.php.
samdanbury 6:37b6d0d56190 12 *
samdanbury 6:37b6d0d56190 13 * Contributors:
samdanbury 6:37b6d0d56190 14 * Ian Craggs - initial API and implementation and/or initial documentation
samdanbury 6:37b6d0d56190 15 *******************************************************************************/
samdanbury 6:37b6d0d56190 16
samdanbury 6:37b6d0d56190 17 #include "MQTTPacket.h"
samdanbury 6:37b6d0d56190 18 #include "StackTrace.h"
samdanbury 6:37b6d0d56190 19
samdanbury 6:37b6d0d56190 20 #include <string.h>
samdanbury 6:37b6d0d56190 21
samdanbury 6:37b6d0d56190 22
samdanbury 6:37b6d0d56190 23 /**
samdanbury 6:37b6d0d56190 24 * Deserializes the supplied (wire) buffer into unsubscribe data
samdanbury 6:37b6d0d56190 25 * @param dup integer returned - the MQTT dup flag
samdanbury 6:37b6d0d56190 26 * @param packetid integer returned - the MQTT packet identifier
samdanbury 6:37b6d0d56190 27 * @param maxcount - the maximum number of members allowed in the topicFilters and requestedQoSs arrays
samdanbury 6:37b6d0d56190 28 * @param count - number of members in the topicFilters and requestedQoSs arrays
samdanbury 6:37b6d0d56190 29 * @param topicFilters - array of topic filter names
samdanbury 6:37b6d0d56190 30 * @param buf the raw buffer data, of the correct length determined by the remaining length field
samdanbury 6:37b6d0d56190 31 * @param buflen the length in bytes of the data in the supplied buffer
samdanbury 6:37b6d0d56190 32 * @return the length of the serialized data. <= 0 indicates error
samdanbury 6:37b6d0d56190 33 */
samdanbury 6:37b6d0d56190 34 int MQTTDeserialize_unsubscribe(unsigned char* dup, unsigned short* packetid, int maxcount, int* count, MQTTString topicFilters[],
samdanbury 6:37b6d0d56190 35 unsigned char* buf, int len)
samdanbury 6:37b6d0d56190 36 {
samdanbury 6:37b6d0d56190 37 MQTTHeader header = {0};
samdanbury 6:37b6d0d56190 38 unsigned char* curdata = buf;
samdanbury 6:37b6d0d56190 39 unsigned char* enddata = NULL;
samdanbury 6:37b6d0d56190 40 int rc = 0;
samdanbury 6:37b6d0d56190 41 int mylen = 0;
samdanbury 6:37b6d0d56190 42
samdanbury 6:37b6d0d56190 43 FUNC_ENTRY;
samdanbury 6:37b6d0d56190 44 header.byte = readChar(&curdata);
samdanbury 6:37b6d0d56190 45 if (header.bits.type != UNSUBSCRIBE)
samdanbury 6:37b6d0d56190 46 goto exit;
samdanbury 6:37b6d0d56190 47 *dup = header.bits.dup;
samdanbury 6:37b6d0d56190 48
samdanbury 6:37b6d0d56190 49 curdata += (rc = MQTTPacket_decodeBuf(curdata, &mylen)); /* read remaining length */
samdanbury 6:37b6d0d56190 50 enddata = curdata + mylen;
samdanbury 6:37b6d0d56190 51
samdanbury 6:37b6d0d56190 52 *packetid = readInt(&curdata);
samdanbury 6:37b6d0d56190 53
samdanbury 6:37b6d0d56190 54 *count = 0;
samdanbury 6:37b6d0d56190 55 while (curdata < enddata)
samdanbury 6:37b6d0d56190 56 {
samdanbury 6:37b6d0d56190 57 if (!readMQTTLenString(&topicFilters[*count], &curdata, enddata))
samdanbury 6:37b6d0d56190 58 goto exit;
samdanbury 6:37b6d0d56190 59 (*count)++;
samdanbury 6:37b6d0d56190 60 }
samdanbury 6:37b6d0d56190 61
samdanbury 6:37b6d0d56190 62 rc = 1;
samdanbury 6:37b6d0d56190 63 exit:
samdanbury 6:37b6d0d56190 64 FUNC_EXIT_RC(rc);
samdanbury 6:37b6d0d56190 65 return rc;
samdanbury 6:37b6d0d56190 66 }
samdanbury 6:37b6d0d56190 67
samdanbury 6:37b6d0d56190 68
samdanbury 6:37b6d0d56190 69 /**
samdanbury 6:37b6d0d56190 70 * Serializes the supplied unsuback data into the supplied buffer, ready for sending
samdanbury 6:37b6d0d56190 71 * @param buf the buffer into which the packet will be serialized
samdanbury 6:37b6d0d56190 72 * @param buflen the length in bytes of the supplied buffer
samdanbury 6:37b6d0d56190 73 * @param packetid integer - the MQTT packet identifier
samdanbury 6:37b6d0d56190 74 * @return the length of the serialized data. <= 0 indicates error
samdanbury 6:37b6d0d56190 75 */
samdanbury 6:37b6d0d56190 76 int MQTTSerialize_unsuback(unsigned char* buf, int buflen, unsigned short packetid)
samdanbury 6:37b6d0d56190 77 {
samdanbury 6:37b6d0d56190 78 MQTTHeader header = {0};
samdanbury 6:37b6d0d56190 79 int rc = 0;
samdanbury 6:37b6d0d56190 80 unsigned char *ptr = buf;
samdanbury 6:37b6d0d56190 81
samdanbury 6:37b6d0d56190 82 FUNC_ENTRY;
samdanbury 6:37b6d0d56190 83 if (buflen < 2)
samdanbury 6:37b6d0d56190 84 {
samdanbury 6:37b6d0d56190 85 rc = MQTTPACKET_BUFFER_TOO_SHORT;
samdanbury 6:37b6d0d56190 86 goto exit;
samdanbury 6:37b6d0d56190 87 }
samdanbury 6:37b6d0d56190 88 header.byte = 0;
samdanbury 6:37b6d0d56190 89 header.bits.type = UNSUBACK;
samdanbury 6:37b6d0d56190 90 writeChar(&ptr, header.byte); /* write header */
samdanbury 6:37b6d0d56190 91
samdanbury 6:37b6d0d56190 92 ptr += MQTTPacket_encode(ptr, 2); /* write remaining length */
samdanbury 6:37b6d0d56190 93
samdanbury 6:37b6d0d56190 94 writeInt(&ptr, packetid);
samdanbury 6:37b6d0d56190 95
samdanbury 6:37b6d0d56190 96 rc = ptr - buf;
samdanbury 6:37b6d0d56190 97 exit:
samdanbury 6:37b6d0d56190 98 FUNC_EXIT_RC(rc);
samdanbury 6:37b6d0d56190 99 return rc;
samdanbury 6:37b6d0d56190 100 }
samdanbury 6:37b6d0d56190 101
samdanbury 6:37b6d0d56190 102