hurufu/nexoid-nexui-flask

Nexo-in-the-cloud demo web application

Hi, I am a programmer.

Current (but not active) project is an implementation of a core of NEXO standards. It's a major evolving specificaiton for payment terminals. I've released it as a free (like in "freedom") and opensource software.

Live demo.

If your interested please contact me using an email from the profile.

nexoid-nexui-flask's Issues

Crash caused by message id overflow

Relevant logs:

2021-03-13 17:23:25.097 D nexoid-fat    dec: <ScapiNngNotification xmlns=""><ntf><events><languageSelection><language>fr</language></languageSelection><serviceSelection><serviceId><payment/></serviceId></serviceSelection><manualEntry><pan>4485936516057131</pan><expirationDate><year>22</year><month>11</month></expirationDate><cvdData><cvd>111</cvd></cvdData></manualEntry><amountEntry><totalAmount>1111111</totalAmount><supplementaryAmount><amount>0</amount></supplementaryAmount><cashbackAmount>0</cashbackAmount></amountEntry></events></ntf><id>0</id></ScapiNngNotification>
2021-03-13 17:23:25,097 D Thread-39     Sent SCAP notification b'<ScapiNngNotification xmlns=""><ntf><events><languageSelection><language>fr</language></languageSelection><serviceSelection><serviceId><payment/></serviceId></serviceSelection><manualEntry><pan>4485936516057131</pan><expirationDate><year>22</year><month>11</month></expirationDate><cvdData><cvd>111</cvd></cvdData></manualEntry><amountEntry><totalAmount>1111111</totalAmount><supplementaryAmount><amount>0</amount></supplementaryAmount><cashbackAmount>0</cashbackAmount></amountEntry></events></ntf><id>0</id></ScapiNngNotification>'
2021-03-13 17:23:25.097 D nexoid-fat    enc: <ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrMsgWelcome/></msg></what></output></req><id>3</id></ScapiNngRequest>
2021-03-13 17:23:25,099 D scap4nexui    Received SCAPI request b'<ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrMsgWelcome/></msg></what></output></req><id>3</id></ScapiNngRequest>'
2021-03-13 17:23:25,101 D reqfrwdr      Received UI request b'{"source":{"type":"scap"},"payload":[{"api":"output","line":["Bienvenue"]}]}'
2021-03-13 17:23:25,113 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:25.115 D nexoid-fat    dec: <ScapiNngResponse><rsp><ack /></rsp><id>524287</id></ScapiNngResponse>
2021-03-13 17:23:25.116 D nexoid-fat    enc: <ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrMsgWelcome/></msg></what></output></req><id>4</id></ScapiNngRequest>
2021-03-13 17:23:25,115 D scap4nexui    SCAPI response b'<ScapiNngResponse><rsp><ack /></rsp><id>524287</id></ScapiNngResponse>'
2021-03-13 17:23:25,118 D scap4nexui    Received SCAPI request b'<ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrMsgWelcome/></msg></what></output></req><id>4</id></ScapiNngRequest>'
2021-03-13 17:23:25,119 D reqfrwdr      Received UI request b'{"source":{"type":"scap"},"payload":[{"api":"output","line":["Bienvenue"]}]}'
2021-03-13 17:23:25,220 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:25,221 D scap4nexui    SCAPI response b'<ScapiNngResponse><rsp><ack /></rsp><id>1048575</id></ScapiNngResponse>'
2021-03-13 17:23:25.222 D nexoid-fat    dec: <ScapiNngResponse><rsp><ack /></rsp><id>1048575</id></ScapiNngResponse>
2021-03-13 17:23:25.222 D nexoid-fat    enc: <ScapiNngRequest><req><updateInterfaces><interfaceStatus>00010111</interfaceStatus></updateInterfaces></req><id>5</id></ScapiNngRequest>
2021-03-13 17:23:25,223 D scap4nexui    Received SCAPI request b'<ScapiNngRequest><req><updateInterfaces><interfaceStatus>00010111</interfaceStatus></updateInterfaces></req><id>5</id></ScapiNngRequest>'
2021-03-13 17:23:25,227 D reqfrwdr      Received UI request b'{"source":{"type":"scap"},"payload":[{"api":"interface","line":["00010111"]}]}'
2021-03-13 17:23:25,322 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:25,324 D scap4nexui    SCAPI response b'<ScapiNngResponse><rsp><ack /></rsp><id>2097151</id></ScapiNngResponse>'
2021-03-13 17:23:25.324 D nexoid-fat    dec: <ScapiNngResponse><rsp><ack /></rsp><id>2097151</id></ScapiNngResponse>
2021-03-13 17:23:25.324 D nexoid-fat    enc: <ScapiNngRequest><req><output><language>fr</language><what><trxAmount>1111111</trxAmount><trxCurrencyAlpha3>PLN</trxCurrencyAlpha3></what></output></req><id>6</id></ScapiNngRequest>
2021-03-13 17:23:25,325 D scap4nexui    Received SCAPI request b'<ScapiNngRequest><req><output><language>fr</language><what><trxAmount>1111111</trxAmount><trxCurrencyAlpha3>PLN</trxCurrencyAlpha3></what></output></req><id>6</id></ScapiNngRequest>'
2021-03-13 17:23:25,326 D reqfrwdr      Received UI request b'{"source":{"type":"scap"},"payload":[{"api":"output","line":["11111.11","PLN"]}]}'
2021-03-13 17:23:25,493 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:25.494 D nexoid-fat    dec: <ScapiNngResponse><rsp><ack /></rsp><id>4194303</id></ScapiNngResponse>
2021-03-13 17:23:25.494 D nexoid-fat    enc: <ScapiNngRequest><req><updateInterfaces><interfaceStatus>00000000</interfaceStatus></updateInterfaces></req><id>7</id></ScapiNngRequest>
2021-03-13 17:23:25,494 D scap4nexui    SCAPI response b'<ScapiNngResponse><rsp><ack /></rsp><id>4194303</id></ScapiNngResponse>'
2021-03-13 17:23:25,499 D scap4nexui    Received SCAPI request b'<ScapiNngRequest><req><updateInterfaces><interfaceStatus>00000000</interfaceStatus></updateInterfaces></req><id>7</id></ScapiNngRequest>'
2021-03-13 17:23:25,500 D reqfrwdr      Received UI request b'{"source":{"type":"scap"},"payload":[{"api":"interface","line":["00000000"]}]}'
2021-03-13 17:23:25,728 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:25.729 D nexoid-fat    dec: <ScapiNngResponse><rsp><ack /></rsp><id>8388607</id></ScapiNngResponse>
2021-03-13 17:23:25.729 D nexoid-fat    enc: <ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrEmvPleaseWait/></msg></what></output></req><id>8</id></ScapiNngRequest>
2021-03-13 17:23:25,729 D scap4nexui    SCAPI response b'<ScapiNngResponse><rsp><ack /></rsp><id>8388607</id></ScapiNngResponse>'
2021-03-13 17:23:25,730 D scap4nexui    Received SCAPI request b'<ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrEmvPleaseWait/></msg></what></output></req><id>8</id></ScapiNngRequest>'
2021-03-13 17:23:25,731 D reqfrwdr      Received UI request b'{"source":{"type":"scap"},"payload":[{"api":"output","line":["\\u23f3\\tS\'il vous pla\\u00eet, attendez..."]}]}'
2021-03-13 17:23:25,913 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:25.914 D nexoid-fat    dec: <ScapiNngResponse><rsp><ack /></rsp><id>16777215</id></ScapiNngResponse>
2021-03-13 17:23:25.915 D nexoid-fat    enc: <ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrEmvApproved/></msg><selectedService><payment/></selectedService></what></output></req><id>9</id></ScapiNngRequest>
2021-03-13 17:23:25,914 D scap4nexui    SCAPI response b'<ScapiNngResponse><rsp><ack /></rsp><id>16777215</id></ScapiNngResponse>'
2021-03-13 17:23:25,918 D scap4nexui    Received SCAPI request b'<ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrEmvApproved/></msg><selectedService><payment/></selectedService></what></output></req><id>9</id></ScapiNngRequest>'
2021-03-13 17:23:25,920 D reqfrwdr      Received UI request b'{"source":{"type":"scap"},"payload":[{"api":"output","line":["\\u2714\\ufe0f\\tApprouv\\u00e9e","Vente"]}]}'
2021-03-13 17:23:26,123 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:26,124 D scap4nexui    SCAPI response b'<ScapiNngResponse><rsp><ack /></rsp><id>33554431</id></ScapiNngResponse>'
2021-03-13 17:23:26.125 D nexoid-fat    dec: <ScapiNngResponse><rsp><ack /></rsp><id>33554431</id></ScapiNngResponse>
2021-03-13 17:23:26.125 D nexoid-fat    enc: <ScapiNngRequest><req><output><language>fr</language><what><ssn><crdhldrSsnCardRemoved/></ssn></what></output></req><id>10</id></ScapiNngRequest>
2021-03-13 17:23:26,126 D scap4nexui    Received SCAPI request b'<ScapiNngRequest><req><output><language>fr</language><what><ssn><crdhldrSsnCardRemoved/></ssn></what></output></req><id>10</id></ScapiNngRequest>'
2021-03-13 17:23:26,127 D reqfrwdr      Received UI request b'{"source":{"type":"scap"},"payload":[{"api":"ssn","line":["Carte supprim\\u00e9e"]}]}'
2021-03-13 17:23:26,287 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:26,289 D scap4nexui    SCAPI response b'<ScapiNngResponse><rsp><ack /></rsp><id>67108863</id></ScapiNngResponse>'
2021-03-13 17:23:26.289 D nexoid-fat    dec: <ScapiNngResponse><rsp><ack /></rsp><id>67108863</id></ScapiNngResponse>
2021-03-13 17:23:26.290 D nexoid-fat    enc: <ScapiNngRequest><req><print><type><merchantReceipt/></type></print></req><id>11</id></ScapiNngRequest>
2021-03-13 17:23:26,290 D scap4nexui    Received SCAPI request b'<ScapiNngRequest><req><print><type><merchantReceipt/></type></print></req><id>11</id></ScapiNngRequest>'
2021-03-13 17:23:26,291 D reqfrwdr      Received UI request b'{"source":{"type":"scap"},"payload":[{"api":"print","line":["merchantReceipt"]}]}'
2021-03-13 17:23:26,404 D reqfrwdr      UI response b'{"ack":null}'
Exception in thread scap4nexui:
Traceback (most recent call last):
  File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.9/threading.py", line 892, in run
    self._target(*self._args, **self._kwargs)
  File "/home/hurufu/nexo/nexoid/nexui-flask/nexui/__init__.py", line 125, in run_scap4nexui
    return scap4nexui.main()
  File "/home/hurufu/nexo/nexoid/nexui-flask/nexui/scap4nexui/__init__.py", line 43, in main
    exchange_messages()
  File "/home/hurufu/nexo/nexoid/nexui-flask/nexui/scap4nexui/__init__.py", line 38, in exchange_messages
    rsp = sm.fromnexui(nexui.recv())
  File "/home/hurufu/nexo/nexoid/nexui-flask/nexui/scap4nexui/scapi_message.py", line 427, in fromnexui
    return asn.encode('ScapiNngResponse', nng_msg, check_constraints=True)
  File "/usr/lib/python3.9/site-packages/asn1tools/compiler.py", line 136, in encode
    type_.check_constraints(data)
  File "/usr/lib/python3.9/site-packages/asn1tools/codecs/compiler.py", line 99, in check_constraints
    return self.constraints_checker.encode(data)
  File "/usr/lib/python3.9/site-packages/asn1tools/codecs/constraints_checker.py", line 331, in encode
    self._type.encode(data)
  File "/usr/lib/python3.9/site-packages/asn1tools/codecs/constraints_checker.py", line 218, in encode
    member.encode(data[name])
  File "/usr/lib/python3.9/site-packages/asn1tools/codecs/constraints_checker.py", line 147, in encode
    raise ConstraintsError(
asn1tools.codecs.ConstraintsError: id: Expected an integer between 0 and 99999999, but got 134217727.
2021-03-13 17:23:29.290 E nexoid-fat    scapi_Data_Print_Interaction: Messaging error (5) at 'nng_recv': Timed out
2021-03-13 17:23:29.290 D nexoid-fat    enc: <ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrMsgReceiptPrintingFailed/></msg><ssn><crdhldrSsnReceiptPrintingFailed/></ssn></what></output></req><id>12</id></ScapiNngRequest>
2021-03-13 17:23:32.290 E nexoid-fat    scapi_Data_Output_Interaction: Messaging error (5) at 'nng_recv': Timed out
2021-03-13 17:23:32.290 D nexoid-fat    enc: <ScapiNngRequest><req><print><type><cardholderReceipt/></type></print></req><id>13</id></ScapiNngRequest>
2021-03-13 17:23:35.290 E nexoid-fat    scapi_Data_Print_Interaction: Messaging error (5) at 'nng_recv': Timed out
2021-03-13 17:23:35.290 D nexoid-fat    enc: <ScapiNngRequest><req><output><language>fr</language><what><msg><crdhldrMsgReceiptPrintingFailed/></msg><ssn><crdhldrSsnReceiptPrintingFailed/></ssn></what></output></req><id>14</id></ScapiNngRequest>
2021-03-13 17:23:38.290 E nexoid-fat    scapi_Data_Output_Interaction: Messaging error (5) at 'nng_recv': Timed out
2021-03-13 17:23:38.290 W nexoid-fat    papi_Diagnostics_Maintenance_Recovery: TER_TIMEOUT N_TECHNICAL_ERROR
2021-03-13 17:23:38.290 D nexoid-fat    t:16917 n:papi_ui prot:req {"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Diagnostics", "Terminal Error: TER_TIMEOUT", "Nok: N_TECHNICAL_ERROR" ]}]}
2021-03-13 17:23:38,290 D reqfrwdr      Received UI request b'{"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Diagnostics", "Terminal Error: TER_TIMEOUT", "Nok: N_TECHNICAL_ERROR" ]}]}'
2021-03-13 17:23:38,299 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:38.299 D nexoid-fat    t:16917 n:papi_ui peer:rep {"ack":null}
2021-03-13 17:23:38.299 D nexoid-fat    t:16917 n:papi_ui prot:req {"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Application restart requested" ]}]}
2021-03-13 17:23:38,300 D reqfrwdr      Received UI request b'{"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Application restart requested" ]}]}'
2021-03-13 17:23:38,398 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:38.399 D nexoid-fat    t:16917 n:papi_ui peer:rep {"ack":null}
2021-03-13 17:23:38.408 D nexoid-fat    t:16917 n:papi_ui prot:req {"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Startup" ]}]}
2021-03-13 17:23:38,409 D reqfrwdr      Received UI request b'{"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Startup" ]}]}'
2021-03-13 17:23:38,486 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:38.486 D nexoid-fat    t:16917 n:papi_ui peer:rep {"ack":null}
2021-03-13 17:23:38.489 D nexoid-cpp    scapi_Authorise_Service
2021-03-13 17:23:38.489 D nexoid-fat    enc: <ScapiNngRequest><req><output><language>pl</language><what><msg><crdhldrMsgWelcome/></msg></what></output></req><id>1</id></ScapiNngRequest>
2021-03-13 17:23:41.490 E nexoid-fat    scapi_Data_Output_Interaction: Messaging error (5) at 'nng_recv': Timed out
2021-03-13 17:23:41.490 W nexoid-fat    papi_Diagnostics_Maintenance_Recovery: TER_TIMEOUT N_TECHNICAL_ERROR
2021-03-13 17:23:41.490 D nexoid-fat    t:16917 n:papi_ui prot:req {"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Diagnostics", "Terminal Error: TER_TIMEOUT", "Nok: N_TECHNICAL_ERROR" ]}]}
2021-03-13 17:23:41,490 D reqfrwdr      Received UI request b'{"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Diagnostics", "Terminal Error: TER_TIMEOUT", "Nok: N_TECHNICAL_ERROR" ]}]}'
2021-03-13 17:23:41,496 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:41.497 D nexoid-fat    t:16917 n:papi_ui peer:rep {"ack":null}
2021-03-13 17:23:41.498 D nexoid-fat    t:16917 n:papi_ui prot:req {"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Application restart requested" ]}]}
2021-03-13 17:23:41,499 D reqfrwdr      Received UI request b'{"source": {"type": "pap"}, "payload": [{"api": "output", "line": [ "Application restart requested" ]}]}'
2021-03-13 17:23:41,646 D reqfrwdr      UI response b'{"ack":null}'
2021-03-13 17:23:41.647 D nexoid-fat    t:16917 n:papi_ui peer:rep {"ack":null}

Backend restarts (crashes) during specific transaction

Using the following transaction trigger:

Back-end restarts, without processing any transaction

Use XML schema for validation of notification events before sending them

XML schema should be generated from ASN.1 modules just before starting up. Consider using free conversion tool from obj-sys: https://www.obj-sys.com/support/asn1c-manuals.php#asn17.5

Authorisation Simulation with simple Yes/No question

Requires HAP endpoint implementation.

Incorrect timestamp on :00 seconds

events.txt

If an event has occurred on a round number of seconds that time is truncated, most probably it's an asn1tools issue. This causes nexoid tc utility to ignore those events.

SoftPoS demo

Came up with a SoftPoS concept using my architecture.

Amount isn't displayed correctly

1. Enter 10000000000 or -1
2. Observe 0.0

Wrong number of digits after decimal separator

1. Enter 1000
2. Observed 10.0
3. Should be 10.00

Add contactless LEDs to developers' UI

Inconsistent order of messages sent in bulk after long disconnection

Messages are mixed up, after long disconnect. Fix isn't required, because it's only a demo application, but some ground work in the underlying protocol should be done to make it implementable in the future.

Screenshot showing out of order messages:

Add card reader support using PC/SC API

in order to deliver SoftPoS demo at least some sort of card reading has to be supported.

• Decide on architecture for the demo
• Implement Card_Inserted event

Add OK, CL and X buttons to developers' UI

So we will be able to test negative UI responses

Crash during amount entry

2021-03-15 20:02:16.013 D nexoid-cpp    scapi_Wait_For_Event ...
Exception in thread reqfrwdr:
Traceback (most recent call last):
  File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.9/threading.py", line 892, in run
    self._target(*self._args, **self._kwargs)
  File "/home/hurufu/nexo/nexoid/nexui-flask/nexui/__init__.py", line 104, in forward_ui_requests
panic: pthread_mutex_lock: Invalid argument
This message is indicative of a BUG.
Report this at https://github.com/nanomsg/nng/issues
    req = nexui.recv()
  File "/usr/lib/python3.9/site-packages/pynng/nng.py", line 454, in recv
/usr/lib/python3.9/site-packages/pynng/_nng.abi3.so(nni_panic+0x114) [0x7f553c1f7864]
/usr/lib/python3.9/site-packages/pynng/_nng.abi3.so(nni_aio_fini+0x1d) [0x7f553c1f111d]
/usr/lib/python3.9/site-packages/pynng/_nng.abi3.so(nni_aio_free+0x18) [0x7f553c1f1258]
/usr/lib/python3.9/site-packages/pynng/_nng.abi3.so(nng_recvmsg+0x92) [0x7f553c1e0632]
/usr/lib/python3.9/site-packages/pynng/_nng.abi3.so(nng_recv+0x37) [0x7f553c1e06b7]
/usr/lib/python3.9/site-packages/pynng/_nng.abi3.so(+0x66bd7) [0x7f553c1d7bd7]
/usr/lib/libpython3.9.so.1.0(+0x14cc12) [0x7f553ee70c12]
/usr/lib/libpython3.9.so.1.0(_PyObject_MakeTpCall+0x30d) [0x7f553ee56f6d]
/usr/lib/libpython3.9.so.1.0(_PyEval_EvalFrameDefault+0x507a) [0x7f553ee52cea]
/usr/lib/libpython3.9.so.1.0(+0x128b0d) [0x7f553ee4cb0d]
/usr/lib/libpython3.9.so.1.0(_PyFunction_Vectorcall+0x34e) [0x7f553ee5ec4e]
/usr/lib/libpython3.9.so.1.0(_PyEval_EvalFrameDefault+0x602) [0x7f553ee4e272]
/usr/lib/libpython3.9.so.1.0(+0x12932f) [0x7f553ee4d32f]
/usr/lib/libpython3.9.so.1.0(_PyFunction_Vectorcall+0x34e) [0x7f553ee5ec4e]
/usr/lib/libpython3.9.so.1.0(_PyEval_EvalFrameDefault+0x3ca) [0x7f553ee4e03a]
/usr/lib/libpython3.9.so.1.0(+0x12932f) [0x7f553ee4d32f]
/usr/lib/libpython3.9.so.1.0(_PyFunction_Vectorcall+0x34e) [0x7f553ee5ec4e]
/usr/lib/libpython3.9.so.1.0(_PyEval_EvalFrameDefault+0x4a11) [0x7f553ee52681]
/usr/lib/libpython3.9.so.1.0(+0x128b0d) [0x7f553ee4cb0d]
/usr/lib/libpython3.9.so.1.0(_PyFunction_Vectorcall+0x34e) [0x7f553ee5ec4e]
/usr/lib/libpython3.9.so.1.0(_PyEval_EvalFrameDefault+0x2ca9) [0x7f553ee50919]
/usr/lib/libpython3.9.so.1.0(_PyFunction_Vectorcall+0x1aa) [0x7f553ee5eaaa]
/usr/lib/libpython3.9.so.1.0(_PyEval_EvalFrameDefault+0x602) [0x7f553ee4e272]
/usr/lib/libpython3.9.so.1.0(_PyFunction_Vectorcall+0x1aa) [0x7f553ee5eaaa]
/usr/lib/libpython3.9.so.1.0(_PyEval_EvalFrameDefault+0x602) [0x7f553ee4e272]
/usr/lib/libpython3.9.so.1.0(_PyFunction_Vectorcall+0x1aa) [0x7f553ee5eaaa]
/usr/lib/libpython3.9.so.1.0(+0x14b334) [0x7f553ee6f334]
/usr/lib/libpython3.9.so.1.0(+0x239006) [0x7f553ef5d006]
/usr/lib/libpython3.9.so.1.0(+0x214a64) [0x7f553ef38a64]
/usr/lib/libpthread.so.0(+0x9299) [0x7f553eb3f299]
/usr/lib/libc.so.6(clone+0x43) [0x7f553ec56053]

Nicer UI with clear indication what is beeing demoed

UI should be nice in the sense it should look like real eCommerce application, with nice card data entry page. There are no strict requirements, because it's only a demo and I'm not an UI designer. Right now it's too technical.