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

MQTTSNSearchClient.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 "MQTTSNPacket.h"
icraggs 0:c524a894b5e8 18 #include "StackTrace.h"
icraggs 0:c524a894b5e8 19
icraggs 0:c524a894b5e8 20 #include <string.h>
icraggs 0:c524a894b5e8 21
icraggs 0:c524a894b5e8 22
icraggs 0:c524a894b5e8 23 /**
icraggs 0:c524a894b5e8 24 * Deserializes the supplied (wire) buffer into advertise data
icraggs 0:c524a894b5e8 25 * @param gatewayid the returned gateway id
icraggs 0:c524a894b5e8 26 * @param duration the returned duration - the time interval until the next advertise will be sent
icraggs 0:c524a894b5e8 27 * @param buf the raw buffer data, of the correct length determined by the remaining length field
icraggs 0:c524a894b5e8 28 * @param buflen the length in bytes of the data in the supplied buffer
icraggs 0:c524a894b5e8 29 * @return error code. 1 is success
icraggs 0:c524a894b5e8 30 */
icraggs 0:c524a894b5e8 31 int MQTTSNDeserialize_advertise(unsigned char* gatewayid, unsigned short* duration, unsigned char* buf, int buflen)
icraggs 0:c524a894b5e8 32 {
icraggs 0:c524a894b5e8 33 unsigned char* curdata = buf;
icraggs 0:c524a894b5e8 34 unsigned char* enddata = NULL;
icraggs 0:c524a894b5e8 35 int rc = 0;
icraggs 0:c524a894b5e8 36 int mylen = 0;
icraggs 0:c524a894b5e8 37
icraggs 0:c524a894b5e8 38 FUNC_ENTRY;
icraggs 0:c524a894b5e8 39 curdata += (rc = MQTTSNPacket_decode(curdata, buflen, &mylen)); /* read length */
icraggs 0:c524a894b5e8 40 enddata = buf + mylen;
icraggs 0:c524a894b5e8 41 if (enddata - curdata > buflen)
icraggs 0:c524a894b5e8 42 goto exit;
icraggs 0:c524a894b5e8 43
icraggs 0:c524a894b5e8 44 if (readChar(&curdata) != MQTTSN_ADVERTISE)
icraggs 0:c524a894b5e8 45 goto exit;
icraggs 0:c524a894b5e8 46
icraggs 0:c524a894b5e8 47 *gatewayid = readChar(&curdata);
icraggs 0:c524a894b5e8 48 *duration = readInt(&curdata);
icraggs 0:c524a894b5e8 49
icraggs 0:c524a894b5e8 50 rc = 1;
icraggs 0:c524a894b5e8 51 exit:
icraggs 0:c524a894b5e8 52 FUNC_EXIT_RC(rc);
icraggs 0:c524a894b5e8 53 return rc;
icraggs 0:c524a894b5e8 54 }
icraggs 0:c524a894b5e8 55
icraggs 0:c524a894b5e8 56
icraggs 0:c524a894b5e8 57
icraggs 0:c524a894b5e8 58 /**
icraggs 0:c524a894b5e8 59 * Serializes the supplied searchgw data into the supplied buffer, ready for sending
icraggs 0:c524a894b5e8 60 * @param buf the buffer into which the packet will be serialized
icraggs 0:c524a894b5e8 61 * @param buflen the length in bytes of the supplied buffer
icraggs 0:c524a894b5e8 62 * @param radius the broadcast radius of this message
icraggs 0:c524a894b5e8 63 * @return the length of the serialized data. <= 0 indicates error
icraggs 0:c524a894b5e8 64 */
icraggs 0:c524a894b5e8 65 int MQTTSNSerialize_searchgw(unsigned char* buf, int buflen, unsigned char radius)
icraggs 0:c524a894b5e8 66 {
icraggs 0:c524a894b5e8 67 unsigned char *ptr = buf;
icraggs 0:c524a894b5e8 68 int len = 0;
icraggs 0:c524a894b5e8 69 int rc = 0;
icraggs 0:c524a894b5e8 70
icraggs 0:c524a894b5e8 71 FUNC_ENTRY;
icraggs 0:c524a894b5e8 72 if ((len = MQTTSNPacket_len(2)) > buflen)
icraggs 0:c524a894b5e8 73 {
icraggs 0:c524a894b5e8 74 rc = MQTTSNPACKET_BUFFER_TOO_SHORT;
icraggs 0:c524a894b5e8 75 goto exit;
icraggs 0:c524a894b5e8 76 }
icraggs 0:c524a894b5e8 77 ptr += MQTTSNPacket_encode(ptr, len); /* write length */
icraggs 0:c524a894b5e8 78 writeChar(&ptr, MQTTSN_SEARCHGW); /* write message type */
icraggs 0:c524a894b5e8 79
icraggs 0:c524a894b5e8 80 writeChar(&ptr, radius);
icraggs 0:c524a894b5e8 81
icraggs 0:c524a894b5e8 82 rc = ptr - buf;
icraggs 0:c524a894b5e8 83 exit:
icraggs 0:c524a894b5e8 84 FUNC_EXIT_RC(rc);
icraggs 0:c524a894b5e8 85 return rc;
icraggs 0:c524a894b5e8 86
icraggs 0:c524a894b5e8 87 }
icraggs 0:c524a894b5e8 88
icraggs 0:c524a894b5e8 89
icraggs 0:c524a894b5e8 90 /**
icraggs 0:c524a894b5e8 91 * Deserializes the supplied (wire) buffer into gwinfo data
icraggs 0:c524a894b5e8 92 * @param gatewayid the returned gateway id
icraggs 0:c524a894b5e8 93 * @param gatewayaddress_len the optional returned length of the gateway address (0 if none)
icraggs 0:c524a894b5e8 94 * @param gatewayaddress the optional returned gateway address (set to NULL if none)
icraggs 0:c524a894b5e8 95 * @param buf the raw buffer data, of the correct length determined by the remaining length field
icraggs 0:c524a894b5e8 96 * @param buflen the length in bytes of the data in the supplied buffer
icraggs 0:c524a894b5e8 97 * @return error code. 1 is success
icraggs 0:c524a894b5e8 98 */
icraggs 0:c524a894b5e8 99 int MQTTSNDeserialize_gwinfo(unsigned char* gatewayid, unsigned short* gatewayaddress_len,
icraggs 0:c524a894b5e8 100 unsigned char** gatewayaddress, unsigned char* buf, int buflen)
icraggs 0:c524a894b5e8 101 {
icraggs 0:c524a894b5e8 102 unsigned char* curdata = buf;
icraggs 0:c524a894b5e8 103 unsigned char* enddata = NULL;
icraggs 0:c524a894b5e8 104 int rc = 0;
icraggs 0:c524a894b5e8 105 int mylen = 0;
icraggs 0:c524a894b5e8 106
icraggs 0:c524a894b5e8 107 FUNC_ENTRY;
icraggs 0:c524a894b5e8 108 curdata += (rc = MQTTSNPacket_decode(curdata, buflen, &mylen)); /* read length */
icraggs 0:c524a894b5e8 109 enddata = buf + mylen;
icraggs 0:c524a894b5e8 110 if (enddata - curdata > buflen)
icraggs 0:c524a894b5e8 111 goto exit;
icraggs 0:c524a894b5e8 112
icraggs 0:c524a894b5e8 113 if (readChar(&curdata) != MQTTSN_GWINFO)
icraggs 0:c524a894b5e8 114 goto exit;
icraggs 0:c524a894b5e8 115
icraggs 0:c524a894b5e8 116 *gatewayid = readChar(&curdata);
icraggs 0:c524a894b5e8 117
icraggs 0:c524a894b5e8 118 *gatewayaddress_len = enddata - curdata;
icraggs 0:c524a894b5e8 119 *gatewayaddress = (gatewayaddress_len > 0) ? curdata : NULL;
icraggs 0:c524a894b5e8 120
icraggs 0:c524a894b5e8 121 rc = 1;
icraggs 0:c524a894b5e8 122 exit:
icraggs 0:c524a894b5e8 123 FUNC_EXIT_RC(rc);
icraggs 0:c524a894b5e8 124 return rc;
icraggs 0:c524a894b5e8 125 }
icraggs 0:c524a894b5e8 126
icraggs 0:c524a894b5e8 127