SpringCore
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    • The SpringCore family
    • SpringCard Companion
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  •  Products
    •  M519
      • Features
    •  PUCK
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      • Features
      • User interface
      • UI Sequences
    •  SpringPark-SD
      • Features
      • User interface
      • UI Sequences
  •  Technical data
    • NFC and RFID HF
    • BLE
    • Smart cards
  •  Host Interfaces
    •  Serial
      • SpringCore Direct
      • CCID (PCSC)
    •  USB
      • SpringCore Direct
      • CCID (PCSC)
      • HID (RFID Scanner)
      • Virtual Comm Port
    •  Bluetooth
      • Standard Services
      • SpringCore Direct
      • CCID (PCSC)
      • Secure CCID
      • HID (RFID Scanner)
    •  Network
      • UDP Direct
      • TCP Direct
      •  TCP Server
        • CCID (PCSC)
        • $SCRDR
        • JSON
      •  UDP Server
        • $SCRDR
        • JSON
      •  MQTT Client
        • Configuration
        • Topics
        • Direct Protocol
        • CCID (PCSC)
        • Smart Reader
      •  HTTP Client
        • $SCRDR
        • JSON
        • IWM2 Legacy
  •  Host Protocols
    •  Direct Protocol
      • Protocol and format
      • Encapsulation within CCID
      • List of CLAsses
      • List of STAtus
      • Secure Communication
      •  PROTOCOL class
        • PING
        • PING EVENT
        • GET DESCRIPTOR
        • STAY QUIET
        • CLEAR QUIET
        • AUTHENTICATE
        • CHANGE KEY
        • SET SERIAL PARAMETERS
        • HOST EVENT POLL
      •  BARCODE class
        • GET CURRENT MODE
        • GET SCAN ENGINE
        • GET SYMBOLOGY
        • SET SYMBOLOGY
        • RESET SYMBOLOGY
      •  CONTROL class
        • List of INStructions
        • List of STAtus
        •  Queries
          •  GET DATA
            • HARDWARE CHARACTERISTICS
            • NETWORK STATE
            • POWER STATE
            • BATTERY DATA
            • TEMPERATURES
            • VOLTAGE AND CURRENT
            • DEVICE STATE
          • BENCHMARK CLEAR
          • BENCHMARK GET
          • GET NETWORK STATS
          • GET BLE STATS
        •  Actions
          • RESET
          • REMOTE DISCONNECT
          • SHUTDOWN
          • PRODUCT SPECIFIC
          • IBEACON
          • CERTIFICATION TESTS
          • COMMON ACTION
        •  IOs and UI
          • I2C READ
          • I2C WRITE
          • GET MODE
          • GET GPIOS
          • SET GPIOS
          • GET CONTROLS
          • PLAY SEQUENCE
          • SET LED RGB
          • SET LEDS
          • SET BUZZER
          • SET LIGHT
          • PLAY SEQUENCE STRING
          • AUTO DIMM LIGHT
          • AUTO SEQUENCES
          • WINK
          • LED modes
        •  Configuration
          • READ FREE REGISTER
          • READ REGISTER
          • WRITE REGISTER
          • LOAD FACTORY CONFIG
          • SAVE FACTORY CONFIG
          • GET DATETIME
          • SET DATETIME
          • MICORE
          • RELOAD CONFIG
        •  CCID
          • CCID GET SLOT NAME
          • CCID STOP SLOT
          • CCID START SLOT
          • CCID CONTROL SLOT
        •  NFC modes
          • NFC POLLER
          • NFC LISTENER
          • NFC HCE STOP
          • NFC HCE START
        •  Reader
          • READER STOP
          • READER ONCE
          • READER START ONE
          • READER START
          • DIRECT OUTPUT ENABLE
          • DIRECT OUTPUT DISABLE
          • BARCODE STOP
          • BARCODE ONCE
          • BARCODE START ONE
          • BARCODE START
        •  PKI
          • GET PKI SUBJECT
          • READ PKI CERTIFICATE
          • WRITE PKI CERTIFICATE
        •  Authenticity
          • IS SEAL GENUINE
          • GET SEAL SUBJECT
          • READ SEAL SIGNATURE
          • WRITE SEAL SIGNATURE
      •  ATCRYPTO class
        • INIT
        • BLANK
        • SET KEY USER
        • SET KEY ADMIN
        • SET PRIVATE KEY
        • GENERATE PRIVATE KEY
        • GET PUBLIC KEY
        • SIGN
        • HASH AND SIGN
        • ECDH
        • GET CSR
        • GET CSR EX
      • SAM AV class
      • HCE class
      • READER class
      •  DFU class
        • List of INStructions
        • List of STAtus
        • GET CONTEXT
        • RESET
        • PUSH TO STORAGE and PUSH TO STORAGE FAST
        • DUMP STORAGE
        • CLEAR STORAGE
        • PUSH TO STORAGE CANCEL
        • PUSH TO ROM
        • Format of Firmware files
      • ECHO class
      • LOGGING class
    •  CCID Protocol (PCSC)
      • Non-USB Control
      • Non-USB Notifications
    • HID Protocol (RFID Scanner)
    •  Smart Reader Protocols
      •  TLV Protocol
        •  $SCRDR Messages
          • $SCRDR Message
          • $SCCMD Message
        •  JSON Messages
          • META Message
          • STATUS Message
          • READER EVENT Message
          • READER COMMAND Message
        •  MK1 Protocol
        • SpringProx Legacy Protocol
      •  PCSC Operation
        •  Standard and API
          • Standard
          • API
          • NET library
        •  PCSC-enabled systems
          •  Windows
            • USB
            • Bluetooth
            • Network
          •  Linux
            • USB
            • Network
          •  Mac OS X
            • USB
        •  PCSC-like libraries
          • Android
          • iOS
          • Windows NET
        •  APDU Interpreter
          • Command list
          • Status Words
          •  Standard instructions
            • GET DATA
            • READ BINARY
            • UPDATE BINARY
            • LOAD KEY
            • GENERAL AUTHENTICATE
            • GET CHALLENGE
          •  Vendor instructions
            • CONTROL
            •  SLOT CONTROL
              • SLOT CONTROL CL
              • SLOT CONTROL CT
            • MIFARE CLASSIC READ
            • MIFARE CLASSIC WRITE
            • MIFARE CLASSIC VALUE
            •  RFID
              • Read Single Block
              • Write Single Block
              • Lock Block
              • Read Multiple Blocks
              • Write Multiple Blocks
              • Select
              • Write AFI
              • Lock AFI
              • Write DSFID
              • Lock DSFID
              • Get System Information
              • Get Multiple Block Security Status
              • Extended Read Single Block
              • Extended Write Single Block
              • Extended Lock Block
              • Extended Read Multiple Blocks
              • Extended Write Multiple Blocks
              • Extended Get Multiple Block Security Status
            •  HCE
              • POLL HCE
              • PUSH HCE
              • CONTROL HCE
            •  SE
              • ATECC SIGN
              • ATECC LOAD KEY
              • ATECC GEN KEY
              • ATECC GET PUB
              • ATECC HASH SIGN
              • ATECC DH
            • ECHO
            • ENCAPSULATE
        • Direct Protocol
      •  Smart Reader Operation
        •  Template engine
          • Technology Selector register
          • Output Format register
          • Output Prefix register
          • Options register
        •  NFC Templates
          • ID Only
          • ISO Data
          • NDEF Data
          • Desfire ID
          • Desfire Data
          • Mifare UltraLight
          • Mifare Classic
          • Mifare Plus SL3
          • ISO 15693 Memory
          • EM4134 Memory
          • SpringBlue
          • Orange NFC Retail
          • Orange NFC Office
          • STid Mobile ID NFC
          • Apple VAS
          • Google SmartTap
          • PAN
          • Calypso
          • Navigo
        •  BLE Template
          • Spy
          • Extended Spy
          • iBeacon
          • SpringBlue
          • Orange Pack ID
          • STid Mobile ID BLE
        •  Python engine
          • startup script
          • processNfc script
          • output script
          •  springcore module
            • springcore
          •  springcore scard module
            • springcore.scard
            • springcore.scard.Card
            • springcore.scard.CardReader
          • logging module
          • utils module
          •  3rd party modules
            • mbedtls
        •  Protocol and API
          •  Commands
            • Start
            • Stop
            • Inventory
            • Exchange
          •  Events
            • Status
            • Tag
          •  TLV data
            • InterfaceAndProtocols
            • TagIndex
            • TagInfo
            • TagId
            • TagData
            • TagDetails
          •  Constants
            • Interfaces
            • Protocols
          •  Encapsulation
        •  RFID Scanner Operation
          •  Non-volatile memory
            •  Constants
              •  Main
                • Fuses
                • Vendor Name
                • Product Name
                • Serial Number
                • Bluetooth Device Name
                • Slot Names
                • USB IDs
                • WinUSB GUID
                • Hardware reference
                • Antenna configuration selector
                • Product sequence
                • HW options
                • FW license
                • MAC Address
                • Bluetooth Address
                • Bluetooth Factory Address
                • Bluetooth Hardware settings
                • Micore Hardware Informations
                • Barcode Hardware settings
                • BGM chip revision string
                • Hardware tag
              •  Internals
                • Firmware ID
                • Firmware CRC
                • Micore FW CRC
                • BGM FW CRC
                • AUDIOPACK CRC
                • Micore SETTINGS CRC
                • DAUGHTER BOARD CRC
                • WIFI FIRMWARE CRC
                • ACIO MODULE CRC
                • USER CODE CRC
                • HW AutoDetect
              •  Custom integrations
                • Brand ID
                • Factory Key ID
                • Factory Public Key
                • Factory Read Key
                • Master Card AID
            •  Configuration
              •  Inventory
                • Configuration GUID
                • Inventory ID
                • Location
                • Rfu3
                • Rfu4
                • Rfu5
                • Rfu6
                • Rfu7
              •  License
                • Application name
                • License key
                • License cryptogram
                • RfuB
                • RfuC
                • RfuD
                • RfuE
                • RfuF
              •  Contactless
                • General
                • CCID Protocols
                • CCID Bitrates
                • CCID Protocol level
                • CCID ATR rules
                • Compliance
                • Advanced power control
                • VASUP frame
                • NFC-A specific options
                • NFC-B specific options
                • NFC-F specific options
                • NFC-V specific options
                • Advanced NFC timings
                • Analog test
              •  Bluetooth
                • TxPower
                • Timings
                • Notifications Registration Timeout
                • Extra options
                • User Device Name
                • Advertising Channel Map
                • iBeacon ID
                • iBeacon UUID
                • custom integration
                • custom integration settings
                • custom integration settings 2
              •  Barcode
                • General
              •  Smartcards
                • Main slot
                • First ID-000 slot
                • Other ID-000 slots
                • ATR default
                • T0 timings
                • T1 timings
                • T0 options
                • Other options
              •  Network
                • IPv4 Settings
                • IPv6 Settings
                • Network options
                • Network services options
                • Network ports
              •  MQTT Client
                • Server
                • TLS Options
                • Client Options
                • Login
                • Password
                • Client ID
                • Topic prefix
                • Device ID
              •  HTTP Client
                • Server
                • Query path
                • Options
                • HMAC key
              •  UDP Server
                • Remote server
                • Options
              •  WiFi settings
                • Connection mode
                • SSID
                • Key or passphrase
              •  Serial
                • Legacy options
                • Driver
              •  Smart Reader
                • Features
                • Timings
                • Keyboard layout
                • Keyboard options
                • Prefix
                • Suffix
              •  PC SC
                • Slot listing
                • Slot listing options
                • Contactless options
                • Driver support
                • CCID host timers
                • APDU interpreter
              •  Main configuration
                • Profile
                • USB options
                • BLE options
                • USB BLE switching
                • Profile addons
                • Battery
                • Battery storage guard
                • Trace level
                • Trace options
                • Deferred commands
              •  User interface
                • Options
                • LED ramp
                • RGB LED settings
                • RGB LED light
                • Auxiliary LEDs
                • Sound
                • Product Specific
                • Theme selection
              •  NFC Emulation and P2P
                • Listener
                • P2P Global Bytes
                • Tag emulation ATS
                • Tag emulation message
              •  Security
                • Access Conditions
                • Authentication counters
                • Master Options
                • Master Key ID
                • Master Auth Key
                • Master Public Key
                • ECC device Key and Options
                • ECC User Key
                • ECC Admin Key
                • User Password
                • Admin Password
            •  Statistics
              • Startup count
              • Clean shutdown count
              • Clean restart count
              • Suspend count
              • Resume count
              • Operating mode change count
              • By host config change count
              • By Master Card config change count
              • Upgrade reset count
              • Factory reset count
              • Flash blocks erase Count
              • Power on charger time
              • Power on battery time
              • Power on USB time
              • Power on POE time
              • Battery charge cycles
              • Battery change count
              • Battery voltage min
              • Contactless discover count
              • Contactless template success count
              • UHF discover count
              • BLE tokens discover count
              • BLE tokens template success Count
              • ID-1 insertion count
              • SAM A insertion count
              • SAM B insertion count
              • SAM C insertion count
              • SAM D insertion count
              • Micore temperature error count
              • Micore general error count
              • Serial connection count
              • Telnet connection count
              • USB connection count
              • BLE connection count
              • TCP connection count
              • Valid master card count
              • Failed master card count
              • Failed authentication counters
              • Valid authentication count
              • Failed authentication count
              • Decryption error count
              • Local download count
              • Local error count
              • Remote download count
              • Remote error count
              • Firmware change count
              • Firmware upgrade count
              • Micore FW upgrade count
              • BGM FW upgrade count
              • AudioPack upgrade count
              • Daugther Board upgrade count
              • Wifi firmware upgrade count
              • ACIO firmware upgrade count
              • Micore settings change count
              • Firmware panic count
              • Watchdog reset count
              • Fault reset count
              • Micore fault count
              • BGM fault count
              • Temperature alert count
              • Temperature fatal count
              • Last error
          •  Secure Elements
            •  SAM AV
              • Key mapping
              • Host interface
            • ATECC
            • ATAES
            •  Certificate Store
            •  Appendixes
              •  Cookbook
                • CCID over TCP
              •  Customer products
                • Socket Mobile
              •  NVM mapping
                • Partition tables
                • X509 certificates
                • Data groups
              •  UI sequences
                •  Authenticity check
                  •  PKI keys and certificates
                    •  TLS client with MQTT
                      • Device certificate and public key
                      • Sample configurations as MQTT-TLS client
                      • Connecting to your own MQTT-TLS server
                • Licenses and credits
                • Revision history

                Non-volatile memory Configuration MQTT Client Topic prefix

                September 3, 2025 at 8:35 AM

                #MQTT Topic prefix

                Address : 028E (bank 2, register 8E)

                Size : 32 bytes

                Type : string

                Default : "springcard/springcore"

                #Description

                Prefix for all MQTT topics

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