Ian Craggs / MQTTSNPacket

Low level MQTTSN packet library, part of the Eclipse Paho project: http://eclipse.org/paho

Dependents:   MQTTSN sara-n200-hello-mqtt-sn MQTTSN_2

The master source for this project is held at: https://github.com/eclipse/paho.mqtt-sn.embedded-c

MQTTSNUnsubscribeServer.c@0:c524a894b5e8, 2015-02-26 (annotated)

Committer:
icraggs
Date:
Thu Feb 26 15:59:36 2015 +0000
Revision:
0:c524a894b5e8
Child:
1:7fa362fa563f
First version that works nicely :-)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
icraggs 0:c524a894b5e8 1 /*******************************************************************************
icraggs 0:c524a894b5e8 2 * Copyright (c) 2014 IBM Corp.
icraggs 0:c524a894b5e8 3 *
icraggs 0:c524a894b5e8 4 * All rights reserved. This program and the accompanying materials
icraggs 0:c524a894b5e8 5 * are made available under the terms of the Eclipse Public License v1.0
icraggs 0:c524a894b5e8 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
icraggs 0:c524a894b5e8 7 *
icraggs 0:c524a894b5e8 8 * The Eclipse Public License is available at
icraggs 0:c524a894b5e8 9 * http://www.eclipse.org/legal/epl-v10.html
icraggs 0:c524a894b5e8 10 * and the Eclipse Distribution License is available at
icraggs 0:c524a894b5e8 11 * http://www.eclipse.org/org/documents/edl-v10.php.
icraggs 0:c524a894b5e8 12 *
icraggs 0:c524a894b5e8 13 * Contributors:
icraggs 0:c524a894b5e8 14 * Ian Craggs - initial API and implementation and/or initial documentation
icraggs 0:c524a894b5e8 15 *******************************************************************************/
icraggs 0:c524a894b5e8 16
icraggs 0:c524a894b5e8 17 #include "StackTrace.h"
icraggs 0:c524a894b5e8 18 #include "MQTTSNPacket.h"
icraggs 0:c524a894b5e8 19
icraggs 0:c524a894b5e8 20 int MQTTSNDeserialize_unsubscribe(unsigned short* packetid, MQTTSN_topicid* topicFilter,
icraggs 0:c524a894b5e8 21 unsigned char* buf, int buflen)
icraggs 0:c524a894b5e8 22 {
icraggs 0:c524a894b5e8 23 MQTTSNFlags flags;
icraggs 0:c524a894b5e8 24 unsigned char* curdata = buf;
icraggs 0:c524a894b5e8 25 unsigned char* enddata = NULL;
icraggs 0:c524a894b5e8 26 int rc = 0;
icraggs 0:c524a894b5e8 27 int mylen = 0;
icraggs 0:c524a894b5e8 28
icraggs 0:c524a894b5e8 29 FUNC_ENTRY;
icraggs 0:c524a894b5e8 30 curdata += (rc = MQTTSNPacket_decode(curdata, buflen, &mylen)); /* read length */
icraggs 0:c524a894b5e8 31 enddata = buf + mylen;
icraggs 0:c524a894b5e8 32 if (enddata - curdata > buflen)
icraggs 0:c524a894b5e8 33 goto exit;
icraggs 0:c524a894b5e8 34
icraggs 0:c524a894b5e8 35 if (readChar(&curdata) != MQTTSN_UNSUBSCRIBE)
icraggs 0:c524a894b5e8 36 goto exit;
icraggs 0:c524a894b5e8 37
icraggs 0:c524a894b5e8 38 flags.all = readChar(&curdata);
icraggs 0:c524a894b5e8 39 *packetid = readInt(&curdata);
icraggs 0:c524a894b5e8 40
icraggs 0:c524a894b5e8 41 topicFilter->type = flags.bits.topicIdType;
icraggs 0:c524a894b5e8 42 if (topicFilter->type == MQTTSN_TOPIC_TYPE_NORMAL)
icraggs 0:c524a894b5e8 43 {
icraggs 0:c524a894b5e8 44 topicFilter->data.long_.len = enddata - curdata;
icraggs 0:c524a894b5e8 45 topicFilter->data.long_.name = (char*)curdata;
icraggs 0:c524a894b5e8 46 }
icraggs 0:c524a894b5e8 47 else if (topicFilter->type == MQTTSN_TOPIC_TYPE_PREDEFINED)
icraggs 0:c524a894b5e8 48 topicFilter->data.id = readInt(&curdata);
icraggs 0:c524a894b5e8 49 else if (topicFilter->type == MQTTSN_TOPIC_TYPE_SHORT)
icraggs 0:c524a894b5e8 50 {
icraggs 0:c524a894b5e8 51 topicFilter->data.short_name[0] = readChar(&curdata);
icraggs 0:c524a894b5e8 52 topicFilter->data.short_name[1] = readChar(&curdata);
icraggs 0:c524a894b5e8 53 }
icraggs 0:c524a894b5e8 54
icraggs 0:c524a894b5e8 55 rc = 1;
icraggs 0:c524a894b5e8 56 exit:
icraggs 0:c524a894b5e8 57 FUNC_EXIT_RC(rc);
icraggs 0:c524a894b5e8 58 return rc;
icraggs 0:c524a894b5e8 59 }
icraggs 0:c524a894b5e8 60
icraggs 0:c524a894b5e8 61
icraggs 0:c524a894b5e8 62 int MQTTSNSerialize_unsuback(unsigned char* buf, int buflen, unsigned short packetid)
icraggs 0:c524a894b5e8 63 {
icraggs 0:c524a894b5e8 64 unsigned char *ptr = buf;
icraggs 0:c524a894b5e8 65 int len = 0;
icraggs 0:c524a894b5e8 66 int rc = 0;
icraggs 0:c524a894b5e8 67
icraggs 0:c524a894b5e8 68 FUNC_ENTRY;
icraggs 0:c524a894b5e8 69 if ((len = MQTTSNPacket_len(7)) > buflen)
icraggs 0:c524a894b5e8 70 {
icraggs 0:c524a894b5e8 71 rc = MQTTSNPACKET_BUFFER_TOO_SHORT;
icraggs 0:c524a894b5e8 72 goto exit;
icraggs 0:c524a894b5e8 73 }
icraggs 0:c524a894b5e8 74 ptr += MQTTSNPacket_encode(ptr, len); /* write length */
icraggs 0:c524a894b5e8 75 writeChar(&ptr, MQTTSN_UNSUBACK); /* write message type */
icraggs 0:c524a894b5e8 76
icraggs 0:c524a894b5e8 77 writeInt(&ptr, packetid);
icraggs 0:c524a894b5e8 78
icraggs 0:c524a894b5e8 79 rc = ptr - buf;
icraggs 0:c524a894b5e8 80 exit:
icraggs 0:c524a894b5e8 81 FUNC_EXIT_RC(rc);
icraggs 0:c524a894b5e8 82 return rc;
icraggs 0:c524a894b5e8 83 }
icraggs 0:c524a894b5e8 84
icraggs 0:c524a894b5e8 85
icraggs 0:c524a894b5e8 86