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| == Introduction ==
| | {{Migrating|https://smartpossdk.gitbook.io/cloudpossdk/cloudpos-sdk/mdb-communication-protocal}} |
| This doc defines a serial communication protocol between the application running on Q3v and MDB Vending machine.
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| Overall,the q3v low level hardware will forwarding the mdb request from the vendg machine,and forward to the Android application as serial data,
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| When the app tackle all the request serial data, the q3v pos could be regarded as a MDB cashless slave device.
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| And also,the application could request some config command, e.g. "get firmware version",Therefore the protocol is 2-way-direction,
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| and there is a mode byte indicates the direction.
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| == Serial Protocol Packet Definition ==
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| === Serial Port parameters ===
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| * Baud rate 115200
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| * 8bit, 1 stop bit, and no parity
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| === Packet format ===
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| {| class="wikitable"
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| |-
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| | Start code || Length || mode || Data || Checksum || End code
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| |}
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| * '''Start code''' size 1 byte, always be 0x09
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| * '''Length''' size: 1byte, the number bytes of mode, data, and checksum.
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| * '''Mode''' size: 1, 0x00 means a master request packet, 0x01 means a slave response packet, other value is prohibited.
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| * '''Data '''size: n bytes. The data could be raw MDB commands, such as SETUP, VEND(please refer the <Multi-Drop Bus Protocol V4.3>for detials).<br>
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| Or the MIB control commands, such as GET VERSION, SET PARAMETER.
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| * '''Checksum''' size: 1byte, using LRC algorithm, input data were "mode, data"
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| == Specifics ==
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| === MDB Forwarding mechanism ===
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| The q3v will forward all the MDB cashless device commands,except the the POLL command,the request and response procedure can be described in following steps:
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| # VMC Send MDB request to q3v
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| # q3v receive the step 1 data,get rid the 9th mdb mode bit,fill into serial packet '''data''' part,sending the serial packet to application.
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| # The application will listen to to the serial port all the time,after receiving step 2 serial data,unwrap it to mdb request data,handle it, and wrap its mdb response into serial packet, sending to q3v
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| # q3v get the step 3 data, unwrap to mdb response data, add mdb mode bit,forwarding to mdb master.
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| # mdb master handle the mdb slave response
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| Taking the '''RESET''' for example
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| # ''VMC -> q3v: 0x110 0x10''
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| # ''q3v -> app: 0x09 0x04 0x00 0x10 0x10 0xE0 0x0D''
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| # ''app -> q3v: 0x09 0x04 0x01 0x00 0x00 0xFF 0x0D''
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| # ''q3v -> VMC: 0x00 0x100''
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| # ''VMC -> q3v: 0x00''
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| === Application notes ===
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| * App need to focus on step 2,3 list above
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| * It's application's own task to tackle all cashless command except the POLL
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| * When the cashless reader is ready for transaction, it lunch a '''begin session''' command,to notify the VMC
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| * mdb raw data including its checksum byte(try to make different with the serial frame checksum )
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| == A typical MDB transacrion flow ==
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| [[File:Mdb flow chart.png|frame|center|MDB transacrion flow]]
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| == Protocol command definition ==
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| === common mdb forwarding command ===
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| '''Description:''' <br>
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| This command for forwarding the raw MDB commands (Including the
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| MDB CHK), Note that the MDB mode bit has been removed
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| {| class="wikitable" | |
| |-
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| ! Mode !! Data
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| |-
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| | Request 00H || VMC Request Command
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| (Reset,Setup,Reader,Expansion,Vend)
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| |}
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| '''Response packet'''<br>
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| {| class="wikitable" | |
| |-
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| ! Mode!! Data
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| |-
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| | Response 01H || Peripheral Response
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| |}
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| '''Example:''' <br>
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| q3v -> app 09 04 00 10 10 E0 0D <br>
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| q3v <- app 09 04 01 00 00 FF 0D.
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| === Begin session command ===
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| '''Description:''' <br>
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| When app ready for transaction, it will issue a begin session command, to inform the VMC master.
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| it is the beginning of one transaction.
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| Balance amount: 2 Bytes, if balance does not exist, it should be filled with 0xFF.
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| This command still obeys the MDB spec definition, however it is request by app
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| {| class="wikitable"
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| |-
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| ! Mode !! Data
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| |-
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| | Request 00H || Begin Session (03H) + Funds Available + MDB Checksum
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| |}
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| '''Response packet'''<br>
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| {| class="wikitable"
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| |-
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| ! Mode!! Data
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| |-
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| | Response 01H || ACK 00H
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| |}
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| '''Example:''' <br>
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| q3v <- app 09 06 00 03 00 64 67 32 0d <br>
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| q3v -> app 09 03 01 00 ff 0d
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| === session cancel request -0x04 ===
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| '''Description:''' <br>
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| App can end the payment session by issue a session cancel request command, pos is in master mode during the command.
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| {| class="wikitable"
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| |-
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| ! Mode !! Data
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| |-
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| | Request 00H || Cancel Session Req(04H) + Funds Available + Checksum
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| |}
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| '''Response packet'''<br>
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| {| class="wikitable"
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| |-
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| ! Mode!! Data
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| |-
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| | Response 01H || ACK 00H
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| |}
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| == Demo ==
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| [http://ftp.wizarpos.com/advanceSDK/mdb/MDBForCoffeeDemo-src-code.zip Source code of terminal APP]
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| [http://ftp.wizarpos.com/advanceSDK/mdb/MDBForCoffeeDemo-sign-wrf.apk APK]
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| [http://ftp.wizarpos.com/advanceSDK/mdb/vmc_master_tool-python-code.zip Source code of PC program]
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| [http://ftp.wizarpos.com/advanceSDK/MDBForCoffeeDemousage20220725.pdf MDBForCoffeeDemo usage]
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