Reliable distribution system with Ruby x IoT

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Reliable distribution system with Ruby x IoT Ruby Conf Taiwan 2019

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whoami ࠓҪᏴհ Shinsuke IMAI Twitter: @imashin_ ! Japan Cookpad inc. / Shopping Platform Department Ruby x IoT

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Topic • Our food delivery service with Ruby x IoT • Building a reliable IoT system

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We do not use mruby

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We use CRuby

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Agenda • What is "cookpad mart" • Building two IoT systems • The way to develop stable IoT system

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Fresh food EC platform released at last summer https://cookpad-mart.com/

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How to use

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Order Choose   a pick-up point

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Order

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Order Order items

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Order

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Pick up Next day, go to the pick-up point

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Pick up Unlock fridge by QR code

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Pick up Pick ordered items up

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Distribution ﬂow

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Ordering to shops Rails batch sends orders to shops by FAX, Mail or Chat tool

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Preparing Shops attach labels to ordered items

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Collecting A carrier collects items  from shops

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Delivering The carriers deliver items   to pick-up points

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We don't have distribution centers

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Deliver in one day Low cost

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Fresh foods

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IoT devices contribute to this distribution system

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IoT devices Security lock on pick-up fridge Label printing system

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Label printing system

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Important point in this distribution Put labels on items Pickup labeled items Print labels

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Prototype of label printer system

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Hardwares iPad (Cellular model) Auto print app Always on Normal label printer Always on Ethernet connection Lightning to USB adapter USB to Ethernet adapter

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1. get label data Workﬂow mart-server Rails iPad Label printer 2. print command 3. printer status 4. printer status

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Failures • Too many steps to set up • Fail many times to print labels ‣ Unstable connection between iPad and label printer ‣ Label printer jam ‣ App crash ‣ App freeze • Unable to update easily

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Label printing system as a product

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Hardwares 1) Don't use iOS devices => Use controllable OS and device 2) Don't use normal label printer => Use businnes-use label printer

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Hardwares STAR MICRONICS TSP700II Thermal label printer Sensors for monitoring SNMP Huawei M2372h-607 LTE USB dongle Raspberry Pi 3 Model B+ Edge controller Arch Linux ARM Router / SSH Server Network monitoring / Kitting

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Network Can't access from server to edge => Use cellular network designed for IoT

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https://www.soracom.io/products/

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Network SORACOM print batch proxy gateway Canal Gate Air Shepherd mart server admin API API Order 6TFS Dongle Printer Raspi

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Software Don't use uncontrollable printer controller => Develop controllable printer controller

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https://rubygems.org/gems/star_ethernet

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https://www.starmicronics.com/support/Mannualfolder/starline_cm_en.pdf

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Sample code require 'star_ethernet' data = [ "Hello\nRuby Conf\nTaiwan!!\n", # command for feed label StarEthernet::Command.form_feed, # command for cut label StarEthernet::Command.partial_cut_current_line, ].flatten.join socket = TCPSocket.new('192.168.11.2', 9100) socket.print(data) socket.close

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Commands

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def set_cancel_the_double_wide_high(n1, n2) [0x1b, 0x69, n1, n2].pack('C*') end def sextuple_font_size set_cancel_the_double_wide_high(0x05, 0x05) end https://www.starmicronics.com/support/Mannualfolder/starline_cm_en.pdf

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require 'star_ethernet' data = [ StarEthernet::Command.quadruple_font_size, "Hello\nRuby Conf\nTaiwan!!\n", StarEthernet::Command.form_feed, StarEthernet::Command.partial_cut_current_line, ].flatten.join socket = TCPSocket.new('192.168.2.3', 9100) socket.print(data) socket.close

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Next update of label printer system

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Next update • LTE USB dongle's signal is not good in some places • AC adapters set is not cool

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Next update Antenna 2ch (5V, 24V) power supply mini PCIe LTE module to USB

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Pick-up point security

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Important point in this distribution • Only user can open the fridge door • It works on unstable LTE network

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Prototype of fridge lock system

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Before

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After At

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It works.

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Hardwares Controller box same with label printer system HF500-W Honeywell QR reader D4SL-N OMRON Lock door switch Key holding force of 1,300N OPEN/CLOSE monitoring LOCK/UNLOCK monitoring DHT11 Temperature sensor

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Attached to fridge

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Requirement User can unlock in any troubles

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Unlocking workflow User Fridge system mart-server mart-edge Fridges JWT token QR Reader Signature verification working on offline status Authorized User Unauthorized user SORACOM Gate SORACOM Canal

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Unlocking workflow User Fridge system mart-server mart-edge Fridges JWT token QR Reader Signature verification working on offline status Authorized User Unauthorized user SORACOM Gate SORACOM Canal

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Unlocking workflow User Fridge system mart-server mart-edge Fridges JWT token QR Reader Signature verification working on offline status Authorized User Unauthorized user SORACOM Gate SORACOM Canal

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Unlocking workflow User Fridge system mart-server mart-edge Fridges JWT token QR Reader Signature verification working on offline status Authorized User Unauthorized user SORACOM Gate SORACOM Canal

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Edge services • QR reader ‣ serial port input mode 3BTQCFSSZ1J 4JOBUSB 23SFBEFS DPOUSPMMFS 23SFBEFS 0.30/MPDL -PDL DPOUSPMMFS User unlock Remote unlock

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QR reader require 'net/http' require 'uri' require 'serialport' HOST = 'http://localhost:9292/qr_reader' SerialPort.open('/dev/ttyACM0', 38400, 8, 1, SerialPort::NONE) do |com| while true begin str = com.gets body = { input: str } Net::HTTP.post_form(URI.parse(HOST), body) rescue => e p e end end end

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Edge services • Sinatra ‣ user / remote unlocking ‣ door status monitoring 3BTQCFSSZ1J 4JOBUSB 23SFBEFS DPOUSPMMFS 23SFBEFS 0.30/MPDL -PDL DPOUSPMMFS User unlock Remote unlock

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Sinatra server class App < Sinatra::Base post '/qr_reader' do body = request.body.read decoded_token = JWT.decode body.input, nil, false if verify(decoded_token) fridges_controller.open_all_fridges end end end

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Edge services • Lock controller ‣ door open/close ‣ door lock/unlock 3BTQCFSSZ1J 4JOBUSB 23SFBEFS DPOUSPMMFS 23SFBEFS 0.30/MPDL -PDL DPOUSPMMFS User unlock Remote unlock

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Lock def door_auto_lock_on_open Thread.new do loop do lock! if opened? sleep 1 end end end def opened? RPi::GPIO.high? (@door_open_closed_detection_contact_pin_num) end def lock! Mutex.new.synchronize do RPi::GPIO.set_low(@solenoid_pin_num) end end

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How to develop reliable IoT products

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What I did • Find problems at ﬁrst by prototyping • Understand what is acceptable and what is not • Make the system robust with designing

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Ruby can do anything • Label printer system ‣ TCP socket programming ‣ Print commands ‣ Kitting codes • Fridge lock system • Control QR reader • Veriﬁcation / Signature • Control fridge lock via GPIO

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