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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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| | 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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| == 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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| # ''VMC -> MIB: 0x00 0x100''
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| # ''VMC -> MIB: 0x00''
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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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