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?
User | Revision | Line number | New 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 |