Elevators

Elevator system for dynamic number of elevator and floors. Direct Erlang API as well as built in TCP server using Netstring messages to interact.

Structure

See diagram Elevators.png (exported from draw.io)

Build

$ rebar3 compile

Usage

Start Application:

application:start(elevators)

Erlang direct api

Erl: Manage external direction call (a button a pressed on a floor to callthe lift)

elevator_control_server:user_call(Floor, Direction)

Types:

    Floor = integer() % The floor at which button is pressed
    Direction = up|down % direction of button call

Erl: Handle/enter floor buttons pressed on the buttons inside the lift

elevator_control_server:elevator_local_destination(ElevatorNum, FloorNum)

Types:

    ElevatorNum = FloorNum = integer()

Netstring client api

Connect to configured port when running. Multiple concurrent connections supported Send strings as below (encoded subsequently as netstring) for control

NetStr: Manage external direction call CALL,{Floor},{Direction},{Status} {Floor} = Integer floor {Direction} = String of "up" or "down" {Status} = "1" for entry e.g. "CALL,0,up,1" for Up button pressed on ground floor (floor 0)