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

MQTTSNSearchServer.c@1:7fa362fa563f, 2016-01-06 (annotated)

Committer:
icraggs
Date:
Wed Jan 06 14:19:27 2016 +0000
Revision:
1:7fa362fa563f
Parent:
0:c524a894b5e8 
Internal function name changes to avoid name clashes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
icraggs 1:7fa362fa563f 1 /*******************************************************************************
icraggs 1:7fa362fa563f 2 * Copyright (c) 2014 IBM Corp.
icraggs 1:7fa362fa563f 3 *
icraggs 1:7fa362fa563f 4 * All rights reserved. This program and the accompanying materials
icraggs 1:7fa362fa563f 5 * are made available under the terms of the Eclipse Public License v1.0
icraggs 1:7fa362fa563f 6 * and Eclipse Distribution License v1.0 which accompany this distribution.
icraggs 1:7fa362fa563f 7 *
icraggs 1:7fa362fa563f 8 * The Eclipse Public License is available at
icraggs 1:7fa362fa563f 9 * http://www.eclipse.org/legal/epl-v10.html
icraggs 1:7fa362fa563f 10 * and the Eclipse Distribution License is available at
icraggs 1:7fa362fa563f 11 * http://www.eclipse.org/org/documents/edl-v10.php.
icraggs 1:7fa362fa563f 12 *
icraggs 1:7fa362fa563f 13 * Contributors:
icraggs 1:7fa362fa563f 14 * Ian Craggs - initial API and implementation and/or initial documentation
icraggs 1:7fa362fa563f 15 *******************************************************************************/
icraggs 1:7fa362fa563f 16
icraggs 1:7fa362fa563f 17 #include "MQTTSNPacket.h"
icraggs 1:7fa362fa563f 18 #include "StackTrace.h"
icraggs 1:7fa362fa563f 19
icraggs 1:7fa362fa563f 20 #include <string.h>
icraggs 1:7fa362fa563f 21
icraggs 1:7fa362fa563f 22
icraggs 1:7fa362fa563f 23 /**
icraggs 1:7fa362fa563f 24 * Serializes the supplied advertise data into the supplied buffer, ready for sending
icraggs 1:7fa362fa563f 25 * @param buf the buffer into which the packet will be serialized
icraggs 1:7fa362fa563f 26 * @param buflen the length in bytes of the supplied buffer
icraggs 1:7fa362fa563f 27 * @param radius the broadcast radius of this message
icraggs 1:7fa362fa563f 28 * @param duration - the time interval until the next advertise will be sent
icraggs 1:7fa362fa563f 29 * @return the length of the serialized data. <= 0 indicates error
icraggs 1:7fa362fa563f 30 */
icraggs 1:7fa362fa563f 31 int MQTTSNSerialize_advertise(unsigned char* buf, int buflen, unsigned char gatewayid, unsigned short duration)
icraggs 1:7fa362fa563f 32 {
icraggs 1:7fa362fa563f 33 unsigned char *ptr = buf;
icraggs 1:7fa362fa563f 34 int len = 0;
icraggs 1:7fa362fa563f 35 int rc = 0;
icraggs 1:7fa362fa563f 36
icraggs 1:7fa362fa563f 37 FUNC_ENTRY;
icraggs 1:7fa362fa563f 38 if ((len = MQTTSNPacket_len(4)) > buflen)
icraggs 1:7fa362fa563f 39 {
icraggs 1:7fa362fa563f 40 rc = MQTTSNPACKET_BUFFER_TOO_SHORT;
icraggs 1:7fa362fa563f 41 goto exit;
icraggs 1:7fa362fa563f 42 }
icraggs 1:7fa362fa563f 43 ptr += MQTTSNPacket_encode(ptr, len); /* write length */
icraggs 1:7fa362fa563f 44 MQTTSNPacket_writeChar(&ptr, MQTTSN_ADVERTISE); /* write message type */
icraggs 1:7fa362fa563f 45
icraggs 1:7fa362fa563f 46 MQTTSNPacket_writeChar(&ptr, gatewayid);
icraggs 1:7fa362fa563f 47 MQTTSNPacket_writeInt(&ptr, duration);
icraggs 1:7fa362fa563f 48
icraggs 1:7fa362fa563f 49 rc = ptr - buf;
icraggs 1:7fa362fa563f 50 exit:
icraggs 1:7fa362fa563f 51 FUNC_EXIT_RC(rc);
icraggs 1:7fa362fa563f 52 return rc;
icraggs 1:7fa362fa563f 53 }
icraggs 1:7fa362fa563f 54
icraggs 0:c524a894b5e8 55
icraggs 1:7fa362fa563f 56 /**
icraggs 1:7fa362fa563f 57 * Deserializes the supplied (wire) buffer into searchgw data
icraggs 1:7fa362fa563f 58 * @param radius the returned broadcast radius of this message
icraggs 1:7fa362fa563f 59 * @param buf the raw buffer data, of the correct length determined by the remaining length field
icraggs 1:7fa362fa563f 60 * @param buflen the length in bytes of the data in the supplied buffer
icraggs 1:7fa362fa563f 61 * @return error code. 1 is success
icraggs 1:7fa362fa563f 62 */
icraggs 1:7fa362fa563f 63 int MQTTSNDeserialize_searchgw(unsigned char* radius, unsigned char* buf, int buflen)
icraggs 1:7fa362fa563f 64 {
icraggs 1:7fa362fa563f 65 unsigned char* curdata = buf;
icraggs 1:7fa362fa563f 66 unsigned char* enddata = NULL;
icraggs 1:7fa362fa563f 67 int rc = 0;
icraggs 1:7fa362fa563f 68 int mylen = 0;
icraggs 1:7fa362fa563f 69
icraggs 1:7fa362fa563f 70 FUNC_ENTRY;
icraggs 1:7fa362fa563f 71 curdata += (rc = MQTTSNPacket_decode(curdata, buflen, &mylen)); /* read length */
icraggs 1:7fa362fa563f 72 enddata = buf + mylen;
icraggs 1:7fa362fa563f 73 if (enddata - curdata > buflen)
icraggs 1:7fa362fa563f 74 goto exit;
icraggs 1:7fa362fa563f 75
icraggs 1:7fa362fa563f 76 if (MQTTSNPacket_readChar(&curdata) != MQTTSN_SEARCHGW)
icraggs 1:7fa362fa563f 77 goto exit;
icraggs 1:7fa362fa563f 78
icraggs 1:7fa362fa563f 79 *radius = MQTTSNPacket_readChar(&curdata);
icraggs 1:7fa362fa563f 80
icraggs 1:7fa362fa563f 81 rc = 1;
icraggs 1:7fa362fa563f 82 exit:
icraggs 1:7fa362fa563f 83 FUNC_EXIT_RC(rc);
icraggs 1:7fa362fa563f 84 return rc;
icraggs 1:7fa362fa563f 85 }
icraggs 1:7fa362fa563f 86
icraggs 1:7fa362fa563f 87
icraggs 1:7fa362fa563f 88 /**
icraggs 1:7fa362fa563f 89 * Serializes the supplied gwinfo data into the supplied buffer, ready for sending
icraggs 1:7fa362fa563f 90 * @param buf the buffer into which the packet will be serialized
icraggs 1:7fa362fa563f 91 * @param buflen the length in bytes of the supplied buffer
icraggs 1:7fa362fa563f 92 * @param gatewayid the gateway id
icraggs 1:7fa362fa563f 93 * @param gatewayaddress_len the optional length of the gateway address (0 if none)
icraggs 1:7fa362fa563f 94 * @param gatewayaddress the optional gateway address (NULL if none)
icraggs 1:7fa362fa563f 95 * @return the length of the serialized data. <= 0 indicates error
icraggs 1:7fa362fa563f 96 */
icraggs 1:7fa362fa563f 97 int MQTTSNSerialize_gwinfo(unsigned char* buf, int buflen, unsigned char gatewayid, unsigned short gatewayaddress_len,
icraggs 1:7fa362fa563f 98 unsigned char* gatewayaddress)
icraggs 1:7fa362fa563f 99 {
icraggs 1:7fa362fa563f 100 unsigned char *ptr = buf;
icraggs 1:7fa362fa563f 101 int len = 0;
icraggs 1:7fa362fa563f 102 int rc = 0;
icraggs 1:7fa362fa563f 103
icraggs 1:7fa362fa563f 104 FUNC_ENTRY;
icraggs 1:7fa362fa563f 105 if ((len = MQTTSNPacket_len(2 + gatewayaddress_len)) > buflen)
icraggs 1:7fa362fa563f 106 {
icraggs 1:7fa362fa563f 107 rc = MQTTSNPACKET_BUFFER_TOO_SHORT;
icraggs 1:7fa362fa563f 108 goto exit;
icraggs 1:7fa362fa563f 109 }
icraggs 1:7fa362fa563f 110 ptr += MQTTSNPacket_encode(ptr, len); /* write length */
icraggs 1:7fa362fa563f 111 MQTTSNPacket_writeChar(&ptr, MQTTSN_GWINFO); /* write message type */
icraggs 1:7fa362fa563f 112
icraggs 1:7fa362fa563f 113 MQTTSNPacket_writeChar(&ptr, gatewayid);
icraggs 1:7fa362fa563f 114 if (gatewayaddress_len > 0 && gatewayaddress != NULL)
icraggs 1:7fa362fa563f 115 {
icraggs 1:7fa362fa563f 116 memcpy(ptr, gatewayaddress, gatewayaddress_len);
icraggs 1:7fa362fa563f 117 ptr += gatewayaddress_len;
icraggs 1:7fa362fa563f 118 }
icraggs 1:7fa362fa563f 119
icraggs 1:7fa362fa563f 120 rc = ptr - buf;
icraggs 1:7fa362fa563f 121 exit:
icraggs 1:7fa362fa563f 122 FUNC_EXIT_RC(rc);
icraggs 1:7fa362fa563f 123 return rc;
icraggs 1:7fa362fa563f 124
icraggs 1:7fa362fa563f 125 }
icraggs 1:7fa362fa563f 126
icraggs 1:7fa362fa563f 127
icraggs 1:7fa362fa563f 128
icraggs 1:7fa362fa563f 129