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Basic specifications

  • Air interface
    • Mesh network - self-forming and self-healing
    • AFU compatible of Source, Node, Gateway, Destination identifier as callsign
    • Protocol adapted to APRS/AX.25.
    • Path control structure (for test purposes only)
    • Structure of the payload embedded in the structure of the message
    • In addition to the transmission security provided by the hardware, CRC and FEC must be planned into the structure of the message
    • Message and payload transmitted compressed
    • Node, Digipeater-only, Gateway-only, Point-to-Point (network extensions)
    • unencrypted
    • Address header (FromCALL, ToCALL, VIA) compressed and with CRC (compatible with AX25v2)
    • Messages prioritization
  • Gateway interface
    • Build MQTT protocol with common field structure
    • UDP transmission
    • Heartbeat for client/server ONLINE detection
    • Depth of message from and to gateway adjustable (test and development facilitation)
    • After restarting a gateway automatic transfer of basic data like:
      • active NODES
      • last messages
      • Triggering the Store & Forward messages
  • Module interfaces
    • Serial via USB
    • GPIO for external hardware and controls
    • GPS internal, external, fixed
    • WiFi
      • User interface
      • Gateway interface
    • Bluetooth
      • APP interface
    • ETH interface optional
  • Message basic types
    • Broadcast
    • Group Call
    • Private Call
    • Store & Forward
    • Development and debug messages
  • Open hardware
    • The use of the compatible MCU should be observed
    • ESP32
    • Ready-made modules MCU, HF, GPS together
    • such as TTGO, TLORA, HELTEC, ...
    • Preferably structure base board, plug-in modules
    • like RAK WisBlock
    • Existing hardware from the LoRa-APRS project
    • Semtech SX1262 LoRa transceiver or compatible
    • ETH module block with IP stack for gateways
  • Firmware
    • Basic structure prepared for development in the group
    • Easy to expand, maintain
    • Clear functional structure
    • No direct hardware reference in the logic structure
    • Logic structure built with clear interfaces to incorporate functional extensions at any time without affecting the tested basic functionality
  • What service does MeshCom 2.0 offer?
    • Text transmission
    • Position transmission (Smart Beaconing)
    • Freely definable payload
  • Feature List
    • Configuration via USB serial interface
    • Callsign with APRS-compliant SSID
    • Frequency setting and display
    • Field strength display (S-meter, RSSI, MER)
    • LoRa modulation parameters also detailed
    • Fix position
    • Battery management stages
    • Scan for available MeshCom channel
  • Use Cases
    • general amateur radio news service
    • Emergency cat radio
    • Information services
      • Weather forecast
      • SolarFlux
      • Radioactivity
      • Lightning detection
      • DXCluster
      • Phonics skeds, SOTA skeds

Design: Kurt OE1KBC

Discussion: TELEGRAM Group MeshCom, FORUM