Reliable distribution system with Ruby x IoT

In our EC service called "Cookpad Mart", we develop Ruby x IoT system which not just works but works with reliability.
By the way, do you cook? Is it easy to get very fresh meats, fishes or vegetables around your home? Cookpad Mart makes it possible for customers to purchase fresh foods directly from farmers, meat shops and fish stores. We deliver ordered foods to pick-up points near your home, so you can pick them up anytime you like, without waiting for the delivery at your home or paying delivery fees.
To deliver fresh foods in the day of orders, we built a new distribution system consisting of several IoT devices: label printing devices, temperature sensors, location sensors and label readers.
In this talk, I explain our development of the label printing system. We set up label printing devices at all sellers’ shop and print labels for each food every day. We have to print the labels without any failures because they are for sellers, deliverers and customers to sort or to pick up foods, but it is difficult to monitor and to control many such edge devices like printers. Then, we solved it with a simple idea. I will talk about how to make the label printers reliable with Ruby and IoT technology.

Transcript

1. Reliable distribution system with Ruby x IoT Ruby Conf Taiwan 2019
2. whoami ࠓҪᏴհ Shinsuke IMAI Twitter: @imashin_ ! Japan Cookpad inc. / Shopping Platform Department Ruby x IoT
3. Topic • Our food delivery service with Ruby x IoT • Building a reliable IoT system
4. We do not use mruby
5. We use CRuby
6. Agenda • What is "cookpad mart" • Building two IoT systems • The way to develop stable IoT system
7. Fresh food EC platform released at last summer https://cookpad-mart.com/
8. How to use
9. Order Choose 
 a pick-up point
10. Order
11. Order Order items
12. Order
13. Pick up Next day, go to the pick-up point
14. Pick up Unlock fridge by QR code
15. Pick up Pick ordered items up
16. Distribution flow
17. Ordering to shops Rails batch sends orders to shops by FAX, Mail or Chat tool
19. Preparing Shops attach labels to ordered items
20. Collecting A carrier collects items
 from shops
21. Delivering The carriers deliver items 
 to pick-up points
22. We don't have distribution centers
23. Deliver in one day Low cost
24. Fresh foods
25. IoT devices contribute to this distribution system
26. IoT devices Security lock on pick-up fridge Label printing system
27. Label printing system
28. Important point in this distribution Put labels on items Pickup labeled items Print labels
29. Prototype of label printer system
30. Hardwares iPad (Cellular model) Auto print app Always on Normal label printer Always on Ethernet connection Lightning to USB adapter USB to Ethernet adapter
31. 1. get label data Workflow mart-server Rails iPad Label printer 2. print command 3. printer status 4. printer status
32. 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
33. Label printing system as a product
34. Hardwares 1) Don't use iOS devices => Use controllable OS and device 2) Don't use normal label printer => Use businnes-use label printer
35. 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
36. Network Can't access from server to edge => Use cellular network designed for IoT
37. https://www.soracom.io/products/
38. Network SORACOM print batch proxy gateway Canal Gate Air Shepherd mart server admin API API Order 6TFS Dongle Printer Raspi
39. Software Don't use uncontrollable printer controller => Develop controllable printer controller
40. https://rubygems.org/gems/star_ethernet
41. https://www.starmicronics.com/support/Mannualfolder/starline_cm_en.pdf
42. 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
43. Commands
44. 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
45. 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
46. Next update of label printer system
47. Next update • LTE USB dongle's signal is not good in some places • AC adapters set is not cool
48. Next update Antenna 2ch (5V, 24V) power supply mini PCIe LTE module to USB
49. Pick-up point security
50. Important point in this distribution • Only user can open the fridge door • It works on unstable LTE network
51. Prototype of fridge lock system
52. Before
54. After At
58. It works.
59. 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
60. Attached to fridge
61. Requirement User can unlock in any troubles
62. 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
63. 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
64. 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
65. 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
66. Edge services • QR reader ‣ serial port input mode 3BTQCFSSZ
    1J 4JOBUSB 23
    SFBEFS
    DPOUSPMMFS 23
    SFBEFS 0.30/
    MPDL -PDL
    DPOUSPMMFS User unlock Remote unlock
67. 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
68. Edge services • Sinatra ‣ user / remote unlocking ‣ door status monitoring 3BTQCFSSZ
    1J 4JOBUSB 23
    SFBEFS
    DPOUSPMMFS 23
    SFBEFS 0.30/
    MPDL -PDL
    DPOUSPMMFS User unlock Remote unlock
69. 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
70. Edge services • Lock controller ‣ door open/close ‣ door lock/unlock 3BTQCFSSZ
    1J 4JOBUSB 23
    SFBEFS
    DPOUSPMMFS 23
    SFBEFS 0.30/
    MPDL -PDL
    DPOUSPMMFS User unlock Remote unlock
71. 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
72. How to develop reliable IoT products
73. What I did • Find problems at first by prototyping • Understand what is acceptable and what is not • Make the system robust with designing
74. 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