RICM4 2017 2018 - UltraTeamMV : SRS

This document is inspired of the IEEE/ANSI 830-1998 Standard.

Introduction

Purpose of the requirements document

This Software Requirements Specification (SRS) identifies the requirements for project UltraTeamMV project. It will present our solution's functionalities and problem solved but also list our system requirements.

Scope of the product

This project mainly consists of a web application development. This app should allow a hikers team to localise each other in real time. It should be really easy to add new members (Numeric code, QRCode, NFC, …). The system should work whether or not there is a 2G/3G/4G or LoRa connection.

Definitions, acronyms and abbreviations

• LoRa = Long Range : Low powered radio based communication technology
• LoRaWAN = Long Range Wide Area Networks : LoRa overlayer to ease (& securise) LoRa communication implementation
• LPWAN = Low Powered Wide Area Networks
• BLE = Bluetooth Low Energy
• GPS = Global Positioning System

References

• The main page of the project
• The UML page

General description

Product perspective

The product is supposed to be an open source. It is a web based system implementing client-server model. The UltraTeamMV System provides simple mechanism for outdoor geolocation in white & gray network areas.

Product functions

This system should allow low energy cost localisation. It should be decentralized as 2G/3G/4G network is sporadic in such environnement. It should also centralize all data to allow sending it to appropriate services (rescue team for instance).

User characteristics

Hikers team, comfortable with using a smartphone but not a technology expert. No financial criteria other than having a smartphone as an ESP32 costs about 5€. Age group = any that is comfortable with using a smartphone hence (~15-70).

General constraints

The system should work whether or not there is a 2G/3G/4G connection Limited localisation accuracy : GPS.

Assumptions and dependencies

As few environnement assumptions as possible. A team needs at least 1 smartphone (with GPS connection) and 1 ESP32 per hiker.

Specific requirements, covering functional, non-functional and interface requirements

This section is supposed to describe two types of requirements :

• System requirements

A structured document setting out detailed descriptions of the system’s functions, services and operational constraints. Defines what should be implemented so may be part of a contract between client and contractor.

• User requirements

Statements in natural language plus diagrams of the services the system provides and its operational constraints. Written for customers.

Those user requirements are described in use case section of the UML page of the project.

Requirement 1 : BLE connection establishment

Function: BLE connection establishment.

Description: Establish a BLE connection between a smartphone and an ESP32.

Inputs: Smartphone.

Source: None.

Outputs: An established BLE connection between ESP & smartphone.

Destination: None.

Action:

1. Identify which devices to connect via smartphone.
2. Connect the two devices.

Non functional requirements: Connection should be established in less than 1 min.

Pre-condition:

• ESP32 & Smartphone are on, with BLE running,
• ESP32 & Smartphone are near enough to communicate via BLE.
• BLE on ESP32 & smartphone should be technologically able to communicate

Post-condition: ESP32 and smartphone are connected via BLE.

Side-effects: None.

Requirement 2 : Distress signal transmission (ESP32 → smartphone)

Function: Distress signal transmission from ESP32 to smartphone via BLE.

Description: As an ESP32 detects a distress signal, it should immediately be transferred to user's smartphone.

Inputs: A distress signal.

Source: User's ESP32.

Outputs: A distress signal.

Destination: User's smartphone.

Action:

1. Detect distress signal,
2. Parse distress signal (is it from user's ESP or from another ESP ? Which is the corresponding location and UID ?),
3. Forge corresponding BLE packet,
4. Send said packet.

Non functional requirements: This transmission should be above all in BLE communication priority.

Pre-condition: ESP32 & Smartphone should be connected via BLE.

Post-condition: Both smartphone and ESP32 are aware of the other user's distress state.

Side-effects: None.

Requirement 3 : Distress signal transmission (smartphone → ESP32)

Function: Distress signal transmission from smartphone to ESP32 via BLE.

Description: As a smartphone detects a distress signal, it should immediately be transferred to user's ESP32.

Inputs: A distress signal.

Source: User's smartphone.

Outputs: A distress signal.

Destination: User's ESP32.

Action:

1. Detect distress signal,
2. Parse distress signal (which is the corresponding location and UID ?),
3. Forge corresponding BLE packet,
4. Send said packet.

Non functional requirements: This transmission should be above all in BLE communication priority.

Pre-condition: ESP32 & Smartphone should be connected via BLE.

Post-condition: Both smartphone and ESP32 are aware of the other user's distress state.

Side-effects: None.

Requirement 4 : Geolocation signal broadcasting

Function: Geolocation signal broadcasting from ESP32 via LoRa

Description: To be known from other ESP32, a geolocation must be broadcasted via LoRa.

Inputs: A geolocation information.

Source: ESP32.

Outputs: A geolocation signal.

Destination: LoRa broadcast.

Action:

1. Forge LoRa packet,
2. Send LoRa packet.

Non functional requirements: ESP can send signal more than 1% of the time via LoRa.

Pre-condition: ESP32 is on and has a geolocation information to send.

Post-condition: None.

Side-effects: None.

Template : Requirement X.Y.Z (in Structured Natural Language)

Function:

Description:

Inputs:

Source:

Outputs:

Destination:

Action:

• Natural language sentences (with MUST, MAY, SHALL)
• Graphical Notations : UML Sequence w/o collaboration diagrams, Process maps, Task Analysis (HTA, CTT)
• Mathematical Notations
• Tabular notations for several (condition --> action) tuples

Non functional requirements:

Pre-condition:

Post-condition:

Side-effects:

Appendices

SRS related documents used to establish this page:

• http://www.cs.st-andrews.ac.uk/~ifs/Books/SE9/Presentations/PPTX/Ch4.pptx
• http://en.wikipedia.org/wiki/Software_requirements_specification
• IEEE Recommended Practice for Software Requirements Specifications IEEE Std 830-1998