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Questions tagged [protocol]

A system of rules designed to allow the communication between two or more participants. The two main types of protocols are either stateless protocols (UDP) or stateful protocols (TCP).

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Is there any way to read the data in STC11F02E?

I need to read the data from the STC11F02E microcontroller. Is there a way to do this?
akifh's user avatar
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2 answers
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Reverse Engineer an ultrasonic cartridge communication with the station to bypass remaining uses

I Have an ultrasonic machine that has a cartridge with a set amount of uses. When that value gets to 0, the cartridge has to be disposed, and a new one bought. The thing is that with some maintenance ...
fpp's user avatar
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What is the protocol used in those datas?

I am currently working on analyzing packet exchanges between a computer and an access control system. At present, the computer and this access control system require an intermediary software to ...
Clarface's user avatar
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1 answer
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microcontroller to microcontroller - is this I2C protocol?

I have a consumer grade hot water boiler that I am trying to interface to get various internal measurements (outlet temp, inlet temp, etc.). The main control board is powered by a defunct Fujitsu ...
DaveInPA's user avatar
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41 views

Microsoft Teams web client: how does Teams knows if a device is allowed or not

In my company I am able to use Ms Teams only inside windows but when I try from a Virtual machine (Hyper-V) running linux it says that this device is not allowed. So how can the Teams Server knows ...
Vince Ricosti's user avatar
2 votes
1 answer
67 views

Keycode from a serial PDA keyboard (iPAQ G750)

I have a folding PDA keyboard (model number iPAQ G750). It is using a proprietary serial protocol, I want to adapt it to Bluetooth using a micro controllers. The keyboard sends out a 2-byte keycode ...
Xinming Chen's user avatar
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0 answers
47 views

Reverse Engineering A RS-485 Steam Shower Protocol

Scenario: A residential steam shower with a control box, touch pad display, and single input contact sensor on a half-duplex, RS-485 daisy chained network. Goal: Determine RS-485 based Link Layer from ...
Jay McClure's user avatar
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9 pin serial port as GPIO

So I have a Royal DS 2260. It's an ancient "digital organizer" from the late 90s. It has a 2.5mm headphone jack that can be used to either send/receive data to and from other digital ...
qwerty keyboard's user avatar
1 vote
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160 views

How to reverse engineer a USB sump pump controller that is not designed to connect to a computer

I have a sump pump monitor / controller that is USB-enabled. The USB port on the side is designed to hook to a WiFi module or a once-promised, now-canceled, never-produced Z-wave module (which is what ...
Nick Williams's user avatar
1 vote
0 answers
183 views

How can I extract the timestamp from this bytestring?

I am missing a piece of the puzzle that is the TCP protocol the Battlefield Bad Company games use to transfer dogtag records to/from the FESL backend. The general packet structure is quite clear and I ...
cetteup's user avatar
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4 votes
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596 views

Decoding the Apple vendor tag in the 802.11 beacon

Background Looking to answer Is there a way to detect if you're connected via a shared WiFi Hotspot? on apple.stackexchange.com lead me to How does iOS and OS X detect when a Wi-Fi network is a ...
thewade's user avatar
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Reverse engineering 18 Bytes protocol

I'm not really used to do algorithm reverse engineering, so I need some help It's a SPI communication between a STM and a wireless chip, hopefully the data were correctly acquired by the logic ...
bigboss59400's user avatar
2 votes
0 answers
628 views

Understanding gRPC message

Problem I intercepted a gRPC network request from an application, and I intend to modify the contents and resend the message programmatically. As no tools (except for MitmProxy, see below) were able ...
WanderingCoder's user avatar
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1 answer
191 views

Identifying the source of encryption used by UDP packets in a PCAP file

I have a PCAP file (mediafire link to the file) which basically represents packet captures between 2 machines running the same game connected to each other via LAN inside RPCS3 using RPCN. One of ...
PirateApp's user avatar
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Help MMO Tcp Packet

I'm trying re-send the packets that an MMO sends to the server just to learn more about packets. The game uses TCP. I sent the same message in the game chat "oi" to analyze the packages sent ...
Rck_'s user avatar
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81 views

Password encryption when transferring from master to PLC

So, there is a PLC and a SoftMaster program to work with it. The PLC works according to the XGFenet protocol. When connecting to the PLC for the first time in SoftMaster, a password must be entered. ...
Pigeoncatcher's user avatar
1 vote
2 answers
189 views

What is the best approach to reverse a custom TCP Application Layer?

I have recorded a TCP Stream using Wireshark, so I have Client/Server Communication as a hex dump. What is the best approach to reverse the custom application layer? Some data seems to be ascii ...
Leander 's user avatar
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1 answer
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Reversing DALY BMS BLE protocol

I am trying to communicate with the DALY BMS (Battery management system) via BLE. I was wondering if anyone has any bit of information regarding their protocol, something to start with?
Stéphane de Luca's user avatar
6 votes
1 answer
2k views

HackRF One - Replay Attack on Garage Door does not work (12 DIP switches)

TL;DR solution Setting 4MHz sample rate and 2Mhz bandwidth in the capture tab (according to the Nyquist theorem the sample rate has to be double the bandwidth) Using the length of a DIP switch ...
John St's user avatar
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2 votes
1 answer
145 views

How to determine a type of binary serialization?

I'm trying to analyze the messages that the game sends to the server through WebSockets. I have a simple WebSockets proxy that stands in the middle and prints all messages to the console. I noticed ...
Lowder's user avatar
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4 votes
2 answers
657 views

On reverse engineering an udp protocol to control a drone

My goal is to control my drone with my raspberry pi using python and not the app that is being delivered together with it. First I connected the app to the drone, flew and used aircrack-ng to get the ...
Pascal Widmann's user avatar
3 votes
1 answer
828 views

Is it possible to sniff an ATA Drive password?

Context: I have a proprietary Tandberg Data RDX QuickStor Internal USB3 drive bay for PC (item number 8666-RDX) and some storage cartridges for it. Esentially, these are just regular TOSHIBA MK3276GSX ...
Brian's user avatar
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5 votes
3 answers
1k views

Modern tools for reversing binary network protocols

What are some modern tools or techniques for attempting to reverse a binary protocol sent over UDP? I've been trying to do research on this, and it seems like almost everything is obselete. Previous ...
Thiery Jacobson's user avatar
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2 answers
309 views

What checksum algorithm is this?

I'm trying to control an air conditioning unit. The app and the unit communicate using the Broadlink protocol. I can decode the settings it's sending and replay them. The payload is 32 bytes but only ...
Enosh's user avatar
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2 votes
1 answer
1k views

Reverse UART communication protocol

I'm objective is to build a custom wifi module to be used on a Samsung AC AR24HSFSAWKN. I have such an official module SWL-B70F for which I'm trying to reverse engineer the communication with the main ...
KumZ's user avatar
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2 answers
288 views

Touch screen driver module - Determine comunication protocol

I have taken apart an old non-functional Lenovo IdeaCentre (B320) computer. I would like to get the glass touch panel to 'work' (I would consider anything from simply being able to sniff the x,y ...
Justin Wylie's user avatar
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1 answer
270 views

Manufacturer interface on OCZ Agility 4 SSD

Inside the housing of an OCZ Agility 4 SSD I found several additional connectors on the opposite site of the SATA connectors. What are they good for and how to connect them properly? Zoomed:
Jonas Stein's user avatar
1 vote
1 answer
125 views

What's wrong with my mitm to support rr commands with gdbserver on IDA?

First of here is the gdb remote protocol doc. The idea of the below script is the following - you enter an actual command (one that will be send as a direct packet see packets) in the gdb window then ...
rec's user avatar
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1 answer
800 views

Determine checksum / CRC algorithm

I am doing reverse engineering on some network protocol. It is client to server communication and I am pretty stuck with identifying checksum (or CRC) algorithm used in packet structure. I tried ...
Tomas's user avatar
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1 vote
1 answer
217 views

Checksum field within IR protocol

I am trying to reverse engineer the IR protocol for my air conditioner (GREE - remote control YAP1FF) and with the data I found online and a lot of testing with a IR receiver there is only one field I ...
andersonhc's user avatar
1 vote
0 answers
303 views

Reconstructing struct/union-based IPC protocol wire format

I'm embarking on my first reverse-engineering adventure. I think I've picked a rather dense piece of steak to start out with. I have three C programs which communicate together using an unknown IPC ...
i336_'s user avatar
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3 votes
0 answers
157 views

Reverse engineering non-standard LIN protocol

I'm trying to reverse engineer an ECU / GSU protocol from a model airplane jet turbine, in order to make a telemetry adapter. I have decoded several other protocols in the past with good success but ...
i3dm's user avatar
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1 vote
0 answers
48 views

Likely protocol determination by chip IDs and connections?

CONTEXT: My first post in this stack. Absolute beginner at RE. Also generally a beginner at anything electronics. Please be kind and correct me instead of ridiculing me. GOAL: Replace a damaged ...
111936's user avatar
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2 votes
1 answer
352 views

UE Megaboom serial protocol

I recently got a UE Megaboom Bluetooth speaker. Apart from various audio profiles, I noticed the speaker also exposes a Serial Port BT profile. I suspect this is the channel the app uses to control ...
user149408's user avatar
0 votes
1 answer
411 views

How to calculate the checksum algorithm with data captures

I have an obsolete control system that I am trying to write an interface into our new control system. I have spent weeks capturing data and figuring out the addressing, polling commands, point ...
ddctech's user avatar
2 votes
1 answer
140 views

Can't identify checksum type in unknown RS485 protocol

I need to reverse a RS485 protocol in order to extract some values for further usage. Unfortunately only these few messages are available at the moment. They repeat continuosly. Only in special ...
Freddy Manila's user avatar
3 votes
1 answer
623 views

Decipher variable length serial protocol

I have an ebike consisting of a controller which regulates power to the motor and a smart LCD which can adjust max speed, power output, pedal assist sensitivity etc as well as displaying the current ...
Mike's user avatar
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3 votes
1 answer
392 views

What Checksum/CRC algorithm in RF packet?

I am banging my head to figure out the checksum of a RF device, it seems to be a simple one but no luck so far... The first 3 bytes is the SyncWord then 9 bytes is the payload and the last byte ...
Rácz Attila's user avatar
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1 answer
440 views

Decoding serial data package

I have an assignment at work, to get information from Jenbacher generator and show values in new SCADA system. It has a B&R CP260 PLC with RS232 port and RS232 to RS485 converter. Currently it’s ...
coddr's user avatar
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2 votes
0 answers
152 views

serial protocol patterns

I am reversing a serial 232 protocol and I found these pattern in the data. E5 A7 CD 01 00 79 .. .. 40 00 23 00 23 00 23 00 23 00 22 00 22 00 22 00 21 follows some recording and expected approx ...
fparaggio's user avatar
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4 votes
0 answers
385 views

Trouble finding the right Checksum algorithm

After reading a lot of posts here and their solutions, Punching lines in CRC calculators for several days now. I can't seem to find on which Checksum this code is based. Background This is a data ...
DanielWittenaar's user avatar
3 votes
1 answer
412 views

NFC Tag reverse engineering failed by a non-responding tag

I was curious about a system using NFC and I tried to find out what was the protocol. But after digging few days around, I have the card detected by my reader (acr122u) but that's all I get. I can't ...
Pascal P.'s user avatar
3 votes
0 answers
2k views

Reverse engineering unknown RS232/UART binary protocol

Background story For couple of days I'm trying to crack the protocol used the old medical device, in order to collect data for a research in an automated way. The device in question is Novametrix ...
kiler129's user avatar
  • 163
2 votes
1 answer
1k views

Deducing Protobuf Schema and Datatypes

I have a number of protobuf files but no .proto schema file! cat myfile.pbuf | protoc --decode_raw > outputfile.txt Using the above command, I was able to decode the file into a somewhat readable ...
David Ferris's user avatar
1 vote
2 answers
3k views

DPFMate Keychain tool

Got this Digital Keychain Photo viewer thingy. Comes with the DPFMate.exe software, which does not run under Windows 10. So far I've confirmed, that it runs perfectly on what they avertise - Windows ...
Rando Hinn's user avatar
1 vote
0 answers
31 views

FFC on the back of a Chromebook Pixel Display Assembly

Hello! I want to get the touch overlay of a Chromebook Pixel Display Assembly to work. I attached a picture of the Cable coming out of a mxT1664S touch controller. Can someone tell me what type of ...
Milan's user avatar
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1 vote
0 answers
126 views

Protocol RE, mysterious checksum function

Im trying to reverse engineer a protocol in which some text is sent and has a specific number appended. I figured out that the number is some kind of a checksum (depends on the text somehow) and also ...
ProtoRev's user avatar
2 votes
3 answers
3k views

How to monitor/reverse engineer RS485-connected display device traffic?

Can anyone point me in the right direction for tutorials etc on reverse engineering RS484 connected battery management system? I have a large 12V lithium battery module which has an internal BMS and ...
Martin Winlow's user avatar
0 votes
1 answer
93 views

What is the format of this time?

I'm trying to interpret a bunch of bytes I'm receiving from a GPS tracker. There are 3 sequential bytes that I believe mean hours, minutes and seconds. I recorded timestamps along with the messages I ...
Gustavo's user avatar
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0 votes
1 answer
529 views

reversing ios notes file format [closed]

I am trying to understand how to read iOS notes files as they are saved in the NoteStore.sqlite database in the iOS backup. Here are some sample files. Each file is a different note. I want to get ...
Nlandau's user avatar