Gsm triangulation jobs

Objective The project has different objectives listed as follows but not limited to: • Establish a virtual infrastructure for the 2/3G network testbed, including base stations, mobile switching centre (MSC)...The ideal candidate should have experience and expertise in the following areas: • Software Area : • C, Python and Object Oriented Programming (Smalltalk is preferred). • Virtual machines, Docker, Git, Github, MangoDB etc • Telecom Area: ( The project’s owner could provide a training session for potential candidates lacks such telecom expertise ) • General knowledge of cellular system specially GSM, GPRS, EDGE and UMTS technologies • Proficient in building and setting up 2G/3G cellular systems • Experience in configuring and man...

*need burger box of 4.5X4.5X5 inch *350 GSM *Clamshell model

*Need burger box of size 4.5X4.5X5 inch *Clamshell model *350 GSM paper

I'm seeking a proficient Flutter developer to create my flutter application that provides indoor tracking using multiple beacons. The data will be received through MQTT protocol and we need triangulation on the received data that provides accurate results. The mobile app will be compatible with both iOS and Android platforms. Key Features: - User Login/Authentication: Implement a secure login system to protect users' data and enhance the personalization aspect of the app. - Push Notifications: Design the app to send out timely notifications hence creating user engagement and stimulate sales. Ideal candidates should have extensive experience in tracking applications, specifically with building e-commerce platforms. The potential developer should have a solid understand...

We require a system that supports calling features using a GSM module. Web interface with keypads from 1 to 9, where each key is associated with a unique phone number. When a specific number is clicked, the phone number will be dialed through the GSM module. Additionally, this system needs to include features such as call termination and displaying keypad options on the webpage while the user hangs up the receiver.

We want to implement MQTT IN 4G A7670C GSM LTE module. We are looking someone who can provide working code for this project we are trying to implement but we are facing issue while implementing it .

...project. The ideal candidate should have experience in developing firmware for IoT devices and must be proficient in the C programming language. Specific Features: - WiFi LR/LORA connectivity to edge/end nodes upto 5 devices - PoE : The firmware should support WAN/LAN to enable the router to connect to the internet. - 4G Support. Other device through WiFi or Ethernet to connect to internet via 4G GSM - Support Industrial IP Protocols such as Modbus/CAN - HTTP/MQTT support for AWS & Azure Cloud: The firmware should have HTTP/MQTT support to facilitate communication with cloud. - Web server functionality: The firmware should have web server functionality to allow for remote access and control features like enabling/ disabling wifi, Ethernet, LTE, Lora and set modes like LR, AP...

...who can create a web application for managing SMS received through our eJoin GSM router. Needs and Objectives: • Message Management: Facilitate a system for managing and sorting incoming messages. • GSM Router Integration: The app must seamlessly integrate with our eJoin GSM router to catch all incoming SMS. • Clean, Modern Design: The application should have a crisp, modern look to ensure user-friendly experiences. • Google Chrome Compatibility: The primary browser for the application should be Google Chrome. If you have experience in web development, especially pertaining to GSM technology, and can create an app with a modern clean design, then this job is perfect for you. Prior experience with eJoin GSM router or similar...

...a kilometer. The end results would be as follows: 1. For every parcel in the range of any gateway, a server receives the tracker ID message at defined interval. 2. Each message contains tracker’s ID and the gateway’s ID – location of the tracker could be then matched with a know location of the gateway. 3. Ideally, the message would contain the strength of the signal – this would allow for triangulation of the location of the parcel. Deliverables 1. High level diagram with the technology architecture showing trackers, gateways and APIs (server is out of scope). This would be a base for a trial proof of concept. -- milestone 1 -- 2. A proposal of 3 different COTS trackers - I must be able to buy them and ship to EU, max budget $50 per tracker. 3. A propo...

Complete Solution for GoIP Hardware (GSM Gateway + SIM Bank) Budget: More than $1000 Primary Purpose: Automation The main goal of a project is a creation of software platform to manage a number of distributed network of GoIP GSM gateways and SIM Banks (SMB). We should be able to make mass calls, SMS/USSD bulk sending & receiving. Asterisk PBX must be used as a Core VoIP component. Features required: - bulk SIM/channel enable/disable/restart - IMEI display/modify - signal level display - human behaviour simulation (to increase SIM cards lifespan) - bulk SMS/USSD sending & receiving - automated SIM cards check, kick dead (blocked) SIM cards if detected - live tracking of ASR and ACD for each SIM card and channel - live total / answered / failed calls per SIM/channel...

Hello, I am currently working on an Arduino project involving a SIM800C module for SMS sending. However, I am facing issues with connecting to the GSM network, and I need assistance from someone with experience in this field. Problem Details: * The SIM800C module is unable to connect to the GSM network. * Messages in the serial monitor indicate unsuccessful connection attempts and errors such as "NORMAL POWER DOWN" and "+CPIN: NOT INSERTED." * Occasionally, irregular results are displayed in the serial monitor, such as "AT+C�������>��w��?�H�AT+CREG?" I am looking for an expert capable of helping me resolve this GSM connection issue. If you have experience with SIM800C modules and Arduino and can provide assistance in solving this...

I am looking for a skilled designer to create a ...Offering - Kraft Paper: Ideal for arts, crafts, DIY projects, holidays, and packaging. - Features: Eco-friendly, recycled, FSC certified, reusable packaging. - Weights: Light (180 GSM), Medium (250 GSM), Heavy (400 GSM) - Sizes: A3, A4, A5, A6 - Sketching Books: Perfect for artists. - Paper Weight: 120 GSM - Sizes: A3, A4, A5, A6 - Cover Weight: 350 GSM - Special Feature: Easy page-turning with creased pages. Deliverables: I want 4 -6 visual to show my products. - logo -6 icons for 6 properties Features: recycled, bio-degradable. printable Weights: Light (180 GSM), Medium (250 GSM), Heavy (400 GSM) Sizes: A3, A4, A5, A6 Page count: 10-25-50-100 - Mockup for packaging ...

...process for the charging sessions 1. **Hardware:** - **Current Sensor:** Use a current sensor to measure the flow of electricity to the EV charger. - **Voltage Sensor:** Measure the voltage to calculate power consumption. - **Microcontroller:** A microcontroller (e.g., Arduino, Raspberry Pi) to process sensor data. - **Communication Module:** For sending data to the app (e.g., Wi-Fi, Bluetooth, GSM, LoRa). - **Power Supply:** Provide a stable power source for the smart meter. 2. **Software:** - **Embedded Software:** Write firmware for the microcontroller to read sensor data and process it. - **Communication Protocol:** Implement a communication protocol for data exchange between the smart meter and the app. - **App Development:** Create a mobile or web app to receive and displ...

I am looking for a freelancer to develop a micro wearable lorawan IoT device (low power) for monitoring and tracking purposes. It should be a micro mandown device and it should send data without GSM cover Requirements: - The device should have specific sensors and functionalities, although I am open to suggestions on what these should be. - There is no specific preference for the operating system or platform that the device should be compatible with. Ideal Skills and Experience: - Strong knowledge and experience in developing wearable IoT devices. - Familiarity with lorawan technology and protocols. - Ability to suggest and integrate appropriate sensors and functionalities for monitoring and tracking purposes. - Proficiency in developing IoT devices compatible with multiple operat...

...supplies, Khadra distinguishes itself by crafting every product by hand, ensuring eco-consciousness from start to finish. Product Offering - Kraft Paper: Ideal for arts, crafts, DIY projects, holidays, and packaging. - Features: Eco-friendly, recycled, FSC certified, reusable packaging. - Weights: Light (180 GSM), Medium (250 GSM), Heavy (400 GSM) - Sizes: A3, A4, A5, A6 - Sketching Books: Perfect for artists. - Paper Weight: 120 GSM - Sizes: A3, A4, A5, A6 - Cover Weight: 350 GSM - Special Feature: Easy page-turning with creased pages. - Custom-Designed Coloring Books: Unique artwork designed by our founder using digital processes like photography and AI. Production Process Our production process marries handmade craftsmanship with...

Posting this project on freelancer.com! Seeking a skilled developer to create an Android application. The app should enable bonding of Wi-Fi and GSM data, optimizing connectivity for faster and more reliable data transmission. Compatibility with servers like MCTCP and OpenVPN is essential. If you're a developer who can bring this vision to life, bid now!

We are looking for a company with experience in raspberry Pi programming and at the same time...each Bluetooth sensor system to get faster and reliable detections with the Bluetooth 5.0+. - Passive GSM & VSS sensor systems For the passive GSM and VSS sensor system your able to use the Nooelec NESDR Nano 3 and the Nooelec NESDR SMArTee v2 SDR. We would advise to use the Nooelec NESDR SMArTee v2. - Cellular and LTE sensor systems For the Cellular and LTE sensor system you should use the bladeRF 2.0 micro xA9. If the client has a specific SDR model or brand that they want to use we can always integrate this for them, of course this will require a small development fee based on the hours we need to put into it. Se ale looking for firmware based passive detection of Bluetoot...

i need a pcb ( made with altium designer) so that i can build in jlcpcb, see image and bid only if u have experience with simcom gsm/gnss (example like sim7080g) and esp32

...there is a search section, if something is searched for goes go to an overview page with all the categories and subcategories animations to make the website feel more smooth - Contact form captcha anti spam ( easy version) users first get the option to select one of these 6 options offerte - levering - afhaling - stock - technische vraag - overige all selections have the same fields: naam email gsm bericht If selection offerte is selected extra field categorie if selection levering is selected extra field: adres If selection afhaling is selected dropdown with 4 options Depot Affligem Depot Ninove Depot Herzele Depot Borchtlombeek when a selection is made: the first option has to be in the subject of the mail For example: WEBSITE | OFFERTE WEBSITE | LEVERING … - Fo...

Project Description: I am looking for an experienced embedded system engineer to assist me with integrating a GSM module and GPS module within a specific timeline of 1 month. Tasks: We need a SIM module to send Date,time and GPS data, to a server, every one minute, via HTTP, by using a GSM module. Hardware Requirements: - No specific hardware requirements, open to suggestions from the engineer - Help needed in deciding on hardware for the project Ideal Skills and Experience: - Strong knowledge and experience in working with embedded systems - Proficiency in programming GSM and GPS modules - Familiarity with integrating different modules - Ability to work within a tight timeline and deliver the project on time

I am looking for a web development specialist with advanced skills in WordPress and Elementor to optimize my sales page and achieve 'pixel perfect' precision. The aim is to ensure the page is visually impeccable and standardized across all devices, maintaining consistent appearance and functionality. Project Details: Page URL: Specific Requirements: Detailed design adjustments to ensure alignment and standardization of all elements across various resolutions and devices. Corrections of any visual or technical inconsistencies. Ensuring a smooth and appealing user experience. I am the owner of the page and hold all the rights to it. Important Note for Proposals: Please submit your proposal with the FINAL TOTAL COST for the project. Proposals that do not

Project Description: Setup a ThingsBoard project for people tracking. I am looking for a freelancer who can help me set up a ThingsBoard project for people tracking based on GSM and GPS. Skills and Experience Required: - Prior experience with setting up ThingsBoard projects - Proficiency in IoT platforms and protocols - Knowledge of data visualization and analytics - Familiarity with MQTT, CoAP, and other communication protocols - Ability to integrate ThingsBoard with existing systems and databases Budget: Less than $100 If you have experience with ThingsBoard and can help me set up this project for my business, please include your past work in your application.

Linux / Asterisk server with 8 port sim gateway outbound call center. (partially inbound) agents with ip phone/gsm phones Agents must able to hold/CB/transfer call to supervisor and other functions with key buttons only. other all standard features. daily excel report for whatsapp pls quote.

I am looking for a freelancer to create a gsm data receiver hardware and develop the corresponding software. The hardware should be able to connect with ATM/POS machines of any type. I have a budget of $500-$1000 for this project. Skills and Experience: - Experience in developing hardware that can connect with ATM/POS machines - Proficiency in GSM data receiver technology - Knowledge of software development for ATM/POS systems is preferred - Ability to work within the specified budget Android app

I need a Raspberry Pi module with a GSM module on with a web server. Module will control GSM controlled gate/doors (call to number is opening a gate/doors) which has register only with one mobile number, but we have a lot of other guest coming so we would like to create server which will have a sim card with number registered on gate/door and our guest will get a link (time-limited) which they could click on so gate or doors1 or doors2 will open. The device should have password protected web interface. 1) Staff will log-in with username/password (admin could create more users, user can change own password, admin will have option to add mobile number linked to gate/door1/door2) 2) Staff/admin will be able to add guest with fields [name] [booking-number] [from-date/time to-...

I am in need of experienced C coding services for a project involving an STM32 and GSM module. The code must be written in C and should be optimized to function most efficiently. Also, I need library support for both the STM32 and GSM module in the code. The freelancer for this project should have previous experience in working with STM32 or GSM modules, as well as expertise in C coding. I have a stm32 discovery board(STMF407G_DISC1) and SIMCOM A7XXX. I need to make the functional code so that the micro does the following: configure the GSM card with AT commands, create a TCPIP server socket and another TCPIP client socket and send some information for test it, detect when the SIM card is disconnected and reconnect it again. Please contact me if you have any ...

Feel free to first provide templates Home: - Welkom + contact button call to action - info about company, a few highlighted projects - Explanation about webdesign ...- Logo design - Business card design Over ons: ( info about the company ) Contact Reviews: - Able to add my own reviews from past clients - Integrate google reviews A secret pricing page not listed ont he site, but where people can see the price of different services like: basic website, premium website, deluxe website… Contact info: gsm: +32 4 72 85 49 46 - Mobile friendly - If possible chatbot connected to whatsapp - Nice to have: SEO optimization - Nice to have: analytics integration - Nice to have: Social media li...

I am in need of experienced C coding services for a project involving an STM32 and GSM module. The code must be written in C and should be optimized to function most efficiently. Also, I need library support for both the STM32 and GSM module in the code. The freelancer for this project should have previous experience in working with STM32 or GSM modules, as well as expertise in C coding. I have a stm32 discovery board(STMF407G_DISC1) and SIMCOM A7XXX. I need to make the functional code so that the micro does the following: configure the GSM card with AT commands, create a TCPIP server socket and another TCPIP client socket and send some information for test it, detect when the SIM card is disconnected and reconnect it again. Please contact me if you have any ...

...acquisition and command transmission to the Hikvision MDVR system. - Extend our C++ TCP listener to capture GPS tracking data. - Ensure HTML5-compatible video streaming. - Optimize video conversion for minimal latency. - Achieve high-speed data processing. Required Real-Time Tracking Metrics: - Ignition status (ACC ON/OFF) - GPS location and orientation Coordinates - Speed - GPS Status & Signal - GSM Status & Signal - Engine uptime (minutes) - Distance traveled (km) - Odometer reading (km) - Fuel metrics: - Level (%) - Volume (L) - Consumption (L) - Efficiency (L/100km & L/H) Video & Photo Access: - Real-time video and photo streaming - Time and date-based retrieval of recorded videos and photos Notifications & Alerts: - Capture all device-generated...

Please see detailed requirement in the attachment. There will be two milestones, one is the schematic, and the other one is the PCB design

...use of the Arduino programming language and should be completed within 2 weeks. Specific requirements: - I have a detailed list of functionality and features that need to be implemented on the ESP32. - Program has to read the data from modbus devices, read the analog input 4-20mA, read the digital inputs, controlling the relay outputs. ESP 32 should connect to the any cloud database by GSM or by LAN/WAN when GSM is not available. More details will be available for selected candidates. - The programmer should be experienced in working with Arduino and have a strong understanding of its capabilities. - Attention to detail is crucial to ensure that all the specified requirements are met accurately. - The project needs to be completed within the given deadline of 2 weeks. Id...

...seeking a creative and talented designer to help us establish a captivating brand identity. The project involves designing key elements that contribute to our brand's visual presence. Scope of Work: Logo Design: Develop a playful and memorable logo that reflects the essence of our kids' clothing brand. Colors and elements should resonate with both children and parents. Pricelist Label (Hangtag, 700 GSM): Create an eye-catching and informative hangtag design for our clothing items. Incorporate necessary product information and pricing. Shipping Bag (Polyamailer): Design a visually appealing polyamailer that enhances the unboxing experience for our customers. Reflect our brand identity on the bag. Wrapping Paper: Develop a charming wrapping paper design that complem...

looking for a Web Developer to create a web app that connects to our eJoin GSM router for managing received messages. take a look at: not the same thing but would be similar

...Goal is to use as much as possible details to identify the position of the device. Ideally a few cm of positioning accurancy. Required skills: - knowledge how to identify high precise position via as much as possible different satelite systems - knowledge how to identify fastly the current position via GSM/LTE positioning - very high knowledge on RTK, AGPS, DGPS, RTCM 3 - very high knowledge on ESP prototyping The current idea is to use ESP8266/ESP32 based devices, along with central managed solutions. generic goal: - identify the current device position as accurate as possible, preferable a few cm - provide well documented code - send position details with accurate time, accuracy of position via

...limitations, this is your specialist approach, in a minimal memory footprint and some percentages of CPU available you are able to create MP4 container conversion for a datapipe in maximal kpbs in minimal network datapipe. Battery will drain if HW available is used more than minimal amount of resources. We need to test the product in order to have certification for products in WIMAX, bands 40 to 80 in GSM, TDMA, CDMA and various flavors of LTE branded networks. Our main HW environments are in Apple, Google, KaiOS products, where we would like to offer a below radar approach, not to be noticed in HW-SW OS resourcing the product in use, while using the bandwidth and prioritizing our software to others in the device while leaving OS functions. If you have experience in music strea...

I'm looking for an experienced mobile app developer to get a project implemented for end to end speech encryption (AES) for calls between two android phones (GSM). The level of encryption is required to be advanced and needs to have a user interface for managing the encryption. No additional features are necessary other than basic encryption functionality. If you have experience with this type of project and you think you would be a great fit, please submit an application for the project.

I am looking for a skilled web developer to create a website for my GSM shop. The main purpose of the website is to serve as both an e-commerce platform and an informational hub for customers. - The website should have a product listings feature, where customers can browse and purchase our GSM products. - Contact information should also be easily accessible, allowing customers to get in touch with us for inquiries or support. - Additionally, I would like to have a blog section on the website, where I can share news, updates, and articles related to GSM technology. Ideal Skills and Experience: - Experience in developing e-commerce websites, preferably using the Shopify platform. - Proficiency in designing and implementing product listings features. - Knowledge of int...

I am looking for a skilled app developer to create an app that allows me to receive GSM phone calls remotely via the internet. The following are the requirements for the project: Operating System Compatibility: - The app should be compatible with the Android operating system. Preferred Programming Language: - There is no preferred programming language for the app development. Features: - The app should solely focus on the functionality of receiving phone calls remotely via the internet and should not include any additional features. Ideal Skills and Experience: - Experience in developing Android apps. - Proficiency in Java or Kotlin programming languages. - Strong knowledge of internet connectivity and remote communication protocols. Basic requirements for the project with exam...

I am looking for a fre...freelancer who can create a standalone GSM Data receiver hardware that will connect with ATM/POS machines. The primary function of the hardware will be to receive and store data. Ideal Skills and Experience: - Experience in developing GSM Data receiver hardware - Knowledge of ATM/POS machine connectivity - Ability to create a standalone device - Proficiency in data storage and retrieval - Familiarity with GSM technology and protocols The hardware should be able to connect with any ATM/POS machine, regardless of the brand or model. The freelancer should have the ability to develop the necessary software to facilitate the data reception and storage. The project requires a freelancer who is detail-oriented, reliable, and experienced in working ...

I am looking for a Python expert with expertise in IOT, specifically in the areas of Bluetooth and Wi-Fi. The ideal candidate should have experience with MQTT as the preferred communication protocol for the project. The expected data load for this project is heavy. This project involves syncing M2M data with IOTDB. The project requires someone with strong Python skills and experience in handling large data loads in an IOT environment. Budget <$200

...Goal is to use as much as possible details to identify the position of the device. Ideally a few cm of positioning accurancy. Required skills: - knowledge how to identify high precise position via as much as possible different satelite systems - knowledge how to identify fastly the current position via GSM/LTE positioning - very high knowledge on RTK, AGPS, DGPS, RTCM 3 - very high knowledge on ESP prototyping The current idea is to use ESP8266/ESP32 based devices, along with central managed solutions. generic goal: - identify the current device position as accurate as possible, preferable a few cm - provide well documented code - send position details with accurate time, accuracy of position via

...Goal is to use as much as possible details to identify the position of the device. Ideally a few cm of positioning accurancy. Required skills: - knowledge how to identify high precise position via as much as possible different satelite systems - knowledge how to identify fastly the current position via GSM/LTE positioning - very high knowledge on RTK, AGPS, DGPS, RTCM 3 - very high knowledge on ESP prototyping The current idea is to use ESP8266/ESP32 based devices, along with central managed solutions. generic goal: - identify the current device position as accurate as possible, preferable a few cm - provide well documented code - send position details with accurate time, accuracy of position via

...freelancer who can create a standalone GSM Data receiver hardware that will connect with ATM/POS machines. The primary function of the hardware will be to receive and store data. Ideal Skills and Experience: - Experience in developing GSM Data receiver hardware - Knowledge of ATM/POS machine connectivity - Ability to create a standalone device - Proficiency in data storage and retrieval - Familiarity with GSM technology and protocols The hardware should be able to connect with any ATM/POS machine, regardless of the brand or model. The freelancer should have the ability to develop the necessary software to facilitate the data reception and storage. The project requires a freelancer who is detail-oriented, reliable, and experienced in working with GSM techno...

...Goal is to use as much as possible details to identify the position of the device. Ideally a few cm of positioning accuracy. Required skills: - knowledge how to identify high precise position via as much as possible different satellite systems - knowledge how to identify fast the current position via GSM/LTE positioning - very high knowledge on RTK, AGPS, DGPS, RTCM 3 - very high knowledge on ESP prototyping The current idea is to use ESP8266/ESP32 based devices, along with central managed solutions. generic goal: - identify the current device position as accurate as possible, preferable a few cm - provide well documented code - send position details with accurate time, accuracy of position via

the program to be implemented is the following: using the HMI you set a sequence of times for each solenoid valve and an electrical conductivity value, choosing which tank to take the fertilizer from. When starting the sequence using the PID of the inverter we should automatically correct the conductivity value. Sector Time minute Ec mS Tank 1 30 3,2 1 2 25 3 1 5 29 2,8 3 7 43 4 2 3 12 1,2 1 6 20 1,1 4 4 15 2 2 8 10 3 4 programming example these parameters must be entered from the Magelis HMI and it is possible to control them from a mobile phone. another parameter that we must measure is the network pressure

...Goal is to use as much as possible details to identify the position of the device. Ideally a few cm of positioning accurancy. Required skills: - knowledge how to identify high precise position via as much as possible different satelite systems - knowledge how to identify fastly the current position via GSM/LTE positioning - very high knowledge on RTK, AGPS, DGPS, RTCM 3 - very high knowledge on ESP prototyping The current idea is to use ESP8266/ESP32 based devices, along with central managed solutions. generic goal: - identify the current device position as accurate as possible, preferable a few cm - provide well documented code - send position details with accurate time, accuracy of position via

...collect real-time CAN Bus data via the OBD2 port, and securely upload to our AWS IoT Core cloud server through GSM connectivity. Requirements: We will require an API to be developed that will integrate the CAN Bus data from the OBD2 device into our primary react native app to enable our users to view both real-time and historical data. - The freelancer should have experience working with OBD2-CAN BUS systems in electric vehicles. - Understanding of different vehicle models and their specific OBD2 protocols is a plus. Your Responsibilities: • Develop and program the ESP32 OBD2 device. • Ensure seamless communication with the vehicle's ECU/Can Bus data via the OBD2 port. • Implement GSM connectivity for secure cloud data transmission. • Collaborate...

...Goal is to use as much as possible details to identify the position of the device. Ideally a few cm of positioning accurancy. Required skills: - knowledge how to identify high precise position via as much as possible different satelite systems - knowledge how to identify fastly the current position via GSM/LTE positioning - very high knowledge on RTK, AGPS, DGPS, RTCM 3 - very high knowledge on ESP prototyping The current idea is to use ESP8266/ESP32 based devices, along with central managed solutions. generic goal: - identify the current device position as accurate as possible, preferable a few cm - provide well documented code - send position details with accurate time, accuracy of position via

...seeking a talented team with expertise in electrical hardware and firmware design for an industrial datalogger cum gateway communication device. The device should able to take all industrial process parameters and electrical parameters in thr form of RS485 and also direct DI, AI mode to send these data to the server through MQTT communication. This smart gateway device should have inbuilt 4G and 5G GSM sim slot facility in addition to eathernet port to access internet connectivity. Also the device should able to locate its GPS location and send to server. Since the device is industrial application purpose, it should build in robost way. The project entails designing a custom PCB and developing firmware to enable seamless communication using the Modbus protocol. Key Requirement...