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Diff: MQTTSNSearchServer.c
- Revision:
- 0:c524a894b5e8
- Child:
- 1:7fa362fa563f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MQTTSNSearchServer.c Thu Feb 26 15:59:36 2015 +0000 @@ -0,0 +1,129 @@ +/******************************************************************************* + * Copyright (c) 2014 IBM Corp. + * + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Eclipse Public License v1.0 + * and Eclipse Distribution License v1.0 which accompany this distribution. + * + * The Eclipse Public License is available at + * http://www.eclipse.org/legal/epl-v10.html + * and the Eclipse Distribution License is available at + * http://www.eclipse.org/org/documents/edl-v10.php. + * + * Contributors: + * Ian Craggs - initial API and implementation and/or initial documentation + *******************************************************************************/ + +#include "MQTTSNPacket.h" +#include "StackTrace.h" + +#include <string.h> + + +/** + * Serializes the supplied advertise data into the supplied buffer, ready for sending + * @param buf the buffer into which the packet will be serialized + * @param buflen the length in bytes of the supplied buffer + * @param radius the broadcast radius of this message + * @param duration - the time interval until the next advertise will be sent + * @return the length of the serialized data. <= 0 indicates error + */ +int MQTTSNSerialize_advertise(unsigned char* buf, int buflen, unsigned char gatewayid, unsigned short duration) +{ + unsigned char *ptr = buf; + int len = 0; + int rc = 0; + + FUNC_ENTRY; + if ((len = MQTTSNPacket_len(4)) > buflen) + { + rc = MQTTSNPACKET_BUFFER_TOO_SHORT; + goto exit; + } + ptr += MQTTSNPacket_encode(ptr, len); /* write length */ + writeChar(&ptr, MQTTSN_ADVERTISE); /* write message type */ + + writeChar(&ptr, gatewayid); + writeInt(&ptr, duration); + + rc = ptr - buf; +exit: + FUNC_EXIT_RC(rc); + return rc; +} + + +/** + * Deserializes the supplied (wire) buffer into searchgw data + * @param radius the returned broadcast radius of this message + * @param buf the raw buffer data, of the correct length determined by the remaining length field + * @param buflen the length in bytes of the data in the supplied buffer + * @return error code. 1 is success + */ +int MQTTSNDeserialize_searchgw(unsigned char* radius, unsigned char* buf, int buflen) +{ + unsigned char* curdata = buf; + unsigned char* enddata = NULL; + int rc = 0; + int mylen = 0; + + FUNC_ENTRY; + curdata += (rc = MQTTSNPacket_decode(curdata, buflen, &mylen)); /* read length */ + enddata = buf + mylen; + if (enddata - curdata > buflen) + goto exit; + + if (readChar(&curdata) != MQTTSN_SEARCHGW) + goto exit; + + *radius = readChar(&curdata); + + rc = 1; +exit: + FUNC_EXIT_RC(rc); + return rc; +} + + +/** + * Serializes the supplied gwinfo data into the supplied buffer, ready for sending + * @param buf the buffer into which the packet will be serialized + * @param buflen the length in bytes of the supplied buffer + * @param gatewayid the gateway id + * @param gatewayaddress_len the optional length of the gateway address (0 if none) + * @param gatewayaddress the optional gateway address (NULL if none) + * @return the length of the serialized data. <= 0 indicates error + */ +int MQTTSNSerialize_gwinfo(unsigned char* buf, int buflen, unsigned char gatewayid, unsigned short gatewayaddress_len, + unsigned char* gatewayaddress) +{ + unsigned char *ptr = buf; + int len = 0; + int rc = 0; + + FUNC_ENTRY; + if ((len = MQTTSNPacket_len(2 + gatewayaddress_len)) > buflen) + { + rc = MQTTSNPACKET_BUFFER_TOO_SHORT; + goto exit; + } + ptr += MQTTSNPacket_encode(ptr, len); /* write length */ + writeChar(&ptr, MQTTSN_GWINFO); /* write message type */ + + writeChar(&ptr, gatewayid); + if (gatewayaddress_len > 0 && gatewayaddress != NULL) + { + memcpy(ptr, gatewayaddress, gatewayaddress_len); + ptr += gatewayaddress_len; + } + + rc = ptr - buf; +exit: + FUNC_EXIT_RC(rc); + return rc; + +} + + + +