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Questions tagged [tlv]

TLV is the short for Type Length Value. It is a technique mostly used to encode optional information within data communication protocols.

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How to prevent SetReadDeadline from timing out connection between reads in go?

I'm writing a simple TLV style service using TCP in go, that should be able to handle multiple connections, and allow for multiple messages to be sent on the same connection. I need to be able to ensure that a message with incorrect length doesn't…
jimpeter
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Issue in parsing TLV data in java, how to get value,length

I have tried many sample codes to parse APDU response to TLV format. I am able to parse it properly if the response length is less but facing issue if length is more(how calculate length of a tag without any libraries) NOTE: I am using predefined…
Uma Achanta
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How to treat two chars in a string as a byte?

Consider: $tag = "4F"; $tag is a string containing two characters, '4' and 'F'. I want to be able to treat these as the upper and lower nibbles respectively of a whole byte (4F) so that I can go on to compute the bit-patterns (01001111) As these…
Andrew Weir
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TLV Parameters in Kannel

My SMS service provider asked me to set the below TLV parameters while connecting to him over SMPP: PRICEPOINT (0x1400) PRODUCT (0x1401) PARTNER ROLE ID (0x1402) How to configure the same in Kannel as it is the first time for me using this SMPP…
Ahmed Negm
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When reading BERTLV, when do you stop?

I have the following BERTLV: 61394F0BA00000030800001001234579074F05A000012345500E49442D4F6E65205049562042494F5F50107777772E6F626572746875722E636F6D7F66080202800002028000 I'm trying to parse this in a recursive way, so I am treating the first part as…
codenamezero
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Read TLV encoded data on JavaCard Classic

I'd like to read TLV encoded certificates on a Java Card (NXP JCOP J3D081, JCOP version 2.4.2, Java Card version 3.0.1 Classic). The cap file is created successfully, but when I try to install it on the card I get an gpshell error: load() returns…
Thomas Stone
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Example for IFA_TTLLLBINARY

Hey i'm a Jpos newbie and i'm having a problem with a field that's using the IFA_TTLLLBINARY ISOMsg isoMsg = new ISOMsg(); isoMsg.setPackager(packager); isoMsg1.setMTI("0100"); //... isoMsg.set(55…
zoey3
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An example for assiging value to the field 55 in iso 8583

Does anyone has an example for assigning value to the 55th Field (Reserved ISO) in the ISO 8583 messages where it should be assigned with a TLV value?
zoey3
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Boost - serialize string with TLV encoding

Is it possible to serialize a string with TLV encoding using boost? Or I should encode first and then just serialize the binary data using boost? If yes then how to encode to TLV?
Narek
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Cannot send a ber-tlv response with a length superior to 127

I have a problem sending IAD format 2 with biometric authentication. I work with a payment terminal and he only accept my IAD when his size is under 23 bytes (like a format 1 IAD) and I don't find where I can specify the format version. Thank you
Axel
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How do I read a record's payload from an NXP MIFARE Ultralight tag?

I've got a couple of NXP MIFARE Ultralight tags (type 2) that contain some data in the first record. I'm using an ACS 1252U to read the tags, and I've tried manually iterating over some of the data to get a sense of what's on the tag, but I can't…
user928112
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EMVCo TLV string parser library for Javascript

I want to parse a TLV string and get the value when I give the tag value. Sample: 000201021642333310011114235204546757034445802IN5910My Company6005Vegas6304bb02 Based on TLV rules Tag 52 will give value 5467, 57 will be 333.
Vishnuraj
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Regex / Python3 - re.findall() - Find all occurrences between opcodes

Background I'm reverse engineering a TCP stream that uses a Type-Length-Value approach to encoding data. Example: TCP Payload:…
gop12
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Decode EMV TLV Data

I am working on a POS application that supports EMV cards. I am able to read card data from a Verifone MX card reader in TLV, but I am facing issues in decoding the TLV data to readable data. I am able to Split the data into TLV Tags and its values.…
Rahul Vijayapuram
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TLV (type-length-value) validation Design Pattern

I am thinking what will be the best pattern (if possible from the gang of four book) to implement the following validation scenario: Let say there is an object that is call TLV (Type Length Value). That looks like that: public class TLV implements…
Tito
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