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meshcore-open/AGENTS.md
Adam Novak 6b4b2d7ce6 Add LowMesh prefix and explain how to add more
2026-04-04 19:40:39 -04:00

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Repository Guidelines

Project Structure & Module Organization

  • Core Flutter code is in lib/, with BLE protocol definitions in lib/connector/meshcore_protocol.dart and BLE transport/state in lib/connector/meshcore_connector.dart.
  • UI lives in lib/screens/ and lib/widgets/, models in lib/models/, tests in test/, and platform runners in android/, ios/, macos/, linux/, windows/, web/.

BLE Frames & Protocol Notes

  • Nordic UART Service (NUS) UUIDs: Service 6e400001-b5a3-f393-e0a9-e50e24dcca9e, RX 6e400002-b5a3-f393-e0a9-e50e24dcca9e, TX 6e400003-b5a3-f393-e0a9-e50e24dcca9e.
  • Discovery: scans for device names matching known prefixes and filters by platformName/advertisementData.advName.
  • Frames are capped at maxFrameSize = 172 bytes; byte 0 is the command/response/push code. I/O is MeshCoreConnector.sendFrame and MeshCoreConnector.receivedFrames.
  • Command codes (to device): cmdAppStart=1, cmdSendTxtMsg=2, cmdSendChannelTxtMsg=3, cmdGetContacts=4, cmdGetDeviceTime=5, cmdSetDeviceTime=6, cmdSendSelfAdvert=7, cmdSetAdvertName=8, cmdAddUpdateContact=9, cmdSyncNextMessage=10, cmdSetRadioParams=11, cmdSetRadioTxPower=12, cmdResetPath=13, cmdSetAdvertLatLon=14, cmdRemoveContact=15, cmdShareContact=16, cmdExportContact=17, cmdImportContact=18, cmdReboot=19, cmdSendLogin=26, cmdGetChannel=31, cmdSetChannel=32, cmdGetRadioSettings=57.
  • Response codes (from device): respCodeOk=0, respCodeErr=1, respCodeContactsStart=2, respCodeContact=3, respCodeEndOfContacts=4, respCodeSelfInfo=5, respCodeSent=6, respCodeContactMsgRecv=7, respCodeChannelMsgRecv=8, respCodeCurrTime=9, respCodeNoMoreMessages=10, respCodeContactMsgRecvV3=16, respCodeChannelMsgRecvV3=17, respCodeChannelInfo=18, respCodeRadioSettings=25.
  • Push codes (async): pushCodeAdvert=0x80, pushCodePathUpdated=0x81, pushCodeSendConfirmed=0x82, pushCodeMsgWaiting=0x83, pushCodeLoginSuccess=0x85, pushCodeLoginFail=0x86, pushCodeLogRxData=0x88, pushCodeNewAdvert=0x8A.
  • Device info: cmdAppStart triggers respCodeSelfInfo with tx power, pubkey, lat/lon, telemetry flags, radio params, and node name (see offsets in lib/connector/meshcore_connector.dart).
  • Radio/time helpers: cmdGetRadioSettings → respCodeRadioSettings; cmdGetDeviceTime → respCodeCurrTime; cmdSetDeviceTime updates device time.
  • Reboot: the UI sends sendCliCommand('reboot') (the raw cmdReboot code exists but no frame builder is wired in yet).
  • Companion radio format: cmdSendTxtMsg expects [cmd][txt_type][attempt][timestamp x4][pub_key_prefix x6][text...] (no flags/full pubkey). CLI commands use txtTypeCliData in the same format, and the app maps forceFlood to attempt 3 when sending.
  • Group text packets (PAYLOAD_TYPE_GRP_TXT): payload is [channel_hash (1)][MAC (2)][encrypted data...]. Decrypted data layout is [timestamp x4][txt_type][text...] where text is "sender: message" (see MeshCore BaseChatMesh::sendGroupMessage). Sender identity is not in the payload; use PUSH_CODE_LOG_RX_DATA raw packet path bytes for origin hash when available.
  • Identity hash: PATH_HASH_SIZE is 1 byte; it is the prefix of the public key (see Identity::copyHashTo). Flooded packets append this hash to the path as they traverse hops. Self-identification via log data should compare sender name and presence of self pubkey prefix within the path bytes.

Build, Test, and Development Commands

  • ~/flutter/bin/flutter pub get installs dependencies (or flutter pub get if Flutter is on PATH).
  • ~/flutter/bin/flutter run launches the app; ~/flutter/bin/flutter build apk|ios produces release builds.
  • ~/flutter/bin/flutter analyze and ~/flutter/bin/flutter test run linting and tests.

Coding Style & Naming Conventions

  • Follow flutter_lints, use lowerCamelCase/UpperCamelCase/snake_case, prefer StatelessWidget + Consumer, and use const constructors.
  • Material widgets only; keep screens simple, handle disconnects by returning to the scanner, and avoid premature abstractions.

Testing Guidelines

  • Tests use flutter_test; add *_test.dart under test/ and run flutter test before UI/protocol changes.

Commit & Pull Request Guidelines

  • Keep commit subjects short and action-focused; PRs should describe behavior changes, link issues, include screenshots for UI changes, and call out BLE protocol changes explicitly.