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/MQTTConnectServer.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 "StackTrace.h"
samdanbury 6:37b6d0d56190 18 #include "MQTTPacket.h"
samdanbury 6:37b6d0d56190 19 #include <string.h>
samdanbury 6:37b6d0d56190 20
samdanbury 6:37b6d0d56190 21 #define min(a, b) ((a < b) ? a : b)
samdanbury 6:37b6d0d56190 22
samdanbury 6:37b6d0d56190 23
samdanbury 6:37b6d0d56190 24 /**
samdanbury 6:37b6d0d56190 25 * Validates MQTT protocol name and version combinations
samdanbury 6:37b6d0d56190 26 * @param protocol the MQTT protocol name as an MQTTString
samdanbury 6:37b6d0d56190 27 * @param version the MQTT protocol version number, as in the connect packet
samdanbury 6:37b6d0d56190 28 * @return correct MQTT combination? 1 is true, 0 is false
samdanbury 6:37b6d0d56190 29 */
samdanbury 6:37b6d0d56190 30 int MQTTPacket_checkVersion(MQTTString* protocol, int version)
samdanbury 6:37b6d0d56190 31 {
samdanbury 6:37b6d0d56190 32 int rc = 0;
samdanbury 6:37b6d0d56190 33
samdanbury 6:37b6d0d56190 34 if (version == 3 && memcmp(protocol->lenstring.data, "MQIdsp",
samdanbury 6:37b6d0d56190 35 min(6, protocol->lenstring.len)) == 0)
samdanbury 6:37b6d0d56190 36 rc = 1;
samdanbury 6:37b6d0d56190 37 else if (version == 4 && memcmp(protocol->lenstring.data, "MQTT",
samdanbury 6:37b6d0d56190 38 min(4, protocol->lenstring.len)) == 0)
samdanbury 6:37b6d0d56190 39 rc = 1;
samdanbury 6:37b6d0d56190 40 return rc;
samdanbury 6:37b6d0d56190 41 }
samdanbury 6:37b6d0d56190 42
samdanbury 6:37b6d0d56190 43
samdanbury 6:37b6d0d56190 44 /**
samdanbury 6:37b6d0d56190 45 * Deserializes the supplied (wire) buffer into connect data structure
samdanbury 6:37b6d0d56190 46 * @param data the connect data structure to be filled out
samdanbury 6:37b6d0d56190 47 * @param buf the raw buffer data, of the correct length determined by the remaining length field
samdanbury 6:37b6d0d56190 48 * @param len the length in bytes of the data in the supplied buffer
samdanbury 6:37b6d0d56190 49 * @return error code. 1 is success, 0 is failure
samdanbury 6:37b6d0d56190 50 */
samdanbury 6:37b6d0d56190 51 int MQTTDeserialize_connect(MQTTPacket_connectData* data, unsigned char* buf, int len)
samdanbury 6:37b6d0d56190 52 {
samdanbury 6:37b6d0d56190 53 MQTTHeader header = {0};
samdanbury 6:37b6d0d56190 54 MQTTConnectFlags flags = {0};
samdanbury 6:37b6d0d56190 55 unsigned char* curdata = buf;
samdanbury 6:37b6d0d56190 56 unsigned char* enddata = &buf[len];
samdanbury 6:37b6d0d56190 57 int rc = 0;
samdanbury 6:37b6d0d56190 58 MQTTString Protocol;
samdanbury 6:37b6d0d56190 59 int version;
samdanbury 6:37b6d0d56190 60 int mylen = 0;
samdanbury 6:37b6d0d56190 61
samdanbury 6:37b6d0d56190 62 FUNC_ENTRY;
samdanbury 6:37b6d0d56190 63 header.byte = readChar(&curdata);
samdanbury 6:37b6d0d56190 64 if (header.bits.type != CONNECT)
samdanbury 6:37b6d0d56190 65 goto exit;
samdanbury 6:37b6d0d56190 66
samdanbury 6:37b6d0d56190 67 curdata += MQTTPacket_decodeBuf(curdata, &mylen); /* read remaining length */
samdanbury 6:37b6d0d56190 68
samdanbury 6:37b6d0d56190 69 if (!readMQTTLenString(&Protocol, &curdata, enddata) ||
samdanbury 6:37b6d0d56190 70 enddata - curdata < 0) /* do we have enough data to read the protocol version byte? */
samdanbury 6:37b6d0d56190 71 goto exit;
samdanbury 6:37b6d0d56190 72
samdanbury 6:37b6d0d56190 73 version = (int)readChar(&curdata); /* Protocol version */
samdanbury 6:37b6d0d56190 74 /* If we don't recognize the protocol version, we don't parse the connect packet on the
samdanbury 6:37b6d0d56190 75 * basis that we don't know what the format will be.
samdanbury 6:37b6d0d56190 76 */
samdanbury 6:37b6d0d56190 77 if (MQTTPacket_checkVersion(&Protocol, version))
samdanbury 6:37b6d0d56190 78 {
samdanbury 6:37b6d0d56190 79 flags.all = readChar(&curdata);
samdanbury 6:37b6d0d56190 80 data->cleansession = flags.bits.cleansession;
samdanbury 6:37b6d0d56190 81 data->keepAliveInterval = readInt(&curdata);
samdanbury 6:37b6d0d56190 82 if (!readMQTTLenString(&data->clientID, &curdata, enddata))
samdanbury 6:37b6d0d56190 83 goto exit;
samdanbury 6:37b6d0d56190 84 if (flags.bits.will)
samdanbury 6:37b6d0d56190 85 {
samdanbury 6:37b6d0d56190 86 data->willFlag = 1;
samdanbury 6:37b6d0d56190 87 data->will.qos = flags.bits.willQoS;
samdanbury 6:37b6d0d56190 88 data->will.retained = flags.bits.willRetain;
samdanbury 6:37b6d0d56190 89 if (!readMQTTLenString(&data->will.topicName, &curdata, enddata) ||
samdanbury 6:37b6d0d56190 90 !readMQTTLenString(&data->will.message, &curdata, enddata))
samdanbury 6:37b6d0d56190 91 goto exit;
samdanbury 6:37b6d0d56190 92 }
samdanbury 6:37b6d0d56190 93 if (flags.bits.username)
samdanbury 6:37b6d0d56190 94 {
samdanbury 6:37b6d0d56190 95 if (enddata - curdata < 3 || !readMQTTLenString(&data->username, &curdata, enddata))
samdanbury 6:37b6d0d56190 96 goto exit; /* username flag set, but no username supplied - invalid */
samdanbury 6:37b6d0d56190 97 if (flags.bits.password &&
samdanbury 6:37b6d0d56190 98 (enddata - curdata < 3 || !readMQTTLenString(&data->password, &curdata, enddata)))
samdanbury 6:37b6d0d56190 99 goto exit; /* password flag set, but no password supplied - invalid */
samdanbury 6:37b6d0d56190 100 }
samdanbury 6:37b6d0d56190 101 else if (flags.bits.password)
samdanbury 6:37b6d0d56190 102 goto exit; /* password flag set without username - invalid */
samdanbury 6:37b6d0d56190 103 rc = 1;
samdanbury 6:37b6d0d56190 104 }
samdanbury 6:37b6d0d56190 105 exit:
samdanbury 6:37b6d0d56190 106 FUNC_EXIT_RC(rc);
samdanbury 6:37b6d0d56190 107 return rc;
samdanbury 6:37b6d0d56190 108 }
samdanbury 6:37b6d0d56190 109
samdanbury 6:37b6d0d56190 110
samdanbury 6:37b6d0d56190 111 /**
samdanbury 6:37b6d0d56190 112 * Serializes the connack packet into the supplied buffer.
samdanbury 6:37b6d0d56190 113 * @param buf the buffer into which the packet will be serialized
samdanbury 6:37b6d0d56190 114 * @param buflen the length in bytes of the supplied buffer
samdanbury 6:37b6d0d56190 115 * @param connack_rc the integer connack return code to be used
samdanbury 6:37b6d0d56190 116 * @param sessionPresent the MQTT 3.1.1 sessionPresent flag
samdanbury 6:37b6d0d56190 117 * @return serialized length, or error if 0
samdanbury 6:37b6d0d56190 118 */
samdanbury 6:37b6d0d56190 119 int MQTTSerialize_connack(unsigned char* buf, int buflen, unsigned char connack_rc, unsigned char sessionPresent)
samdanbury 6:37b6d0d56190 120 {
samdanbury 6:37b6d0d56190 121 MQTTHeader header = {0};
samdanbury 6:37b6d0d56190 122 int rc = 0;
samdanbury 6:37b6d0d56190 123 unsigned char *ptr = buf;
samdanbury 6:37b6d0d56190 124 MQTTConnackFlags flags = {0};
samdanbury 6:37b6d0d56190 125
samdanbury 6:37b6d0d56190 126 FUNC_ENTRY;
samdanbury 6:37b6d0d56190 127 if (buflen < 2)
samdanbury 6:37b6d0d56190 128 {
samdanbury 6:37b6d0d56190 129 rc = MQTTPACKET_BUFFER_TOO_SHORT;
samdanbury 6:37b6d0d56190 130 goto exit;
samdanbury 6:37b6d0d56190 131 }
samdanbury 6:37b6d0d56190 132 header.byte = 0;
samdanbury 6:37b6d0d56190 133 header.bits.type = CONNACK;
samdanbury 6:37b6d0d56190 134 writeChar(&ptr, header.byte); /* write header */
samdanbury 6:37b6d0d56190 135
samdanbury 6:37b6d0d56190 136 ptr += MQTTPacket_encode(ptr, 2); /* write remaining length */
samdanbury 6:37b6d0d56190 137
samdanbury 6:37b6d0d56190 138 flags.all = 0;
samdanbury 6:37b6d0d56190 139 flags.bits.sessionpresent = sessionPresent;
samdanbury 6:37b6d0d56190 140 writeChar(&ptr, flags.all);
samdanbury 6:37b6d0d56190 141 writeChar(&ptr, connack_rc);
samdanbury 6:37b6d0d56190 142
samdanbury 6:37b6d0d56190 143 rc = ptr - buf;
samdanbury 6:37b6d0d56190 144 exit:
samdanbury 6:37b6d0d56190 145 FUNC_EXIT_RC(rc);
samdanbury 6:37b6d0d56190 146 return rc;
samdanbury 6:37b6d0d56190 147 }
samdanbury 6:37b6d0d56190 148