mirror of
https://github.com/zjs81/meshcore-open.git
synced 2026-07-20 15:51:01 +10:00
Initial commit: MeshCore Open Flutter client
Open-source Flutter client for MeshCore LoRa mesh networking devices. Features: - BLE device scanning and connection - Nordic UART Service (NUS) integration - Material 3 design with system theme support - Provider-based state management - Placeholder screens for chat, contacts, and settings 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
zach
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import 'dart:convert';
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import 'dart:typed_data';
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// Command codes (to device)
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const int cmdAppStart = 1;
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const int cmdSendTxtMsg = 2;
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const int cmdSendChannelTxtMsg = 3;
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const int cmdGetContacts = 4;
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const int cmdGetDeviceTime = 5;
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const int cmdSetDeviceTime = 6;
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const int cmdSendSelfAdvert = 7;
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const int cmdSetAdvertName = 8;
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const int cmdAddUpdateContact = 9;
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const int cmdSyncNextMessage = 10;
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const int cmdSetRadioParams = 11;
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const int cmdSetRadioTxPower = 12;
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const int cmdResetPath = 13;
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const int cmdSetAdvertLatLon = 14;
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const int cmdRemoveContact = 15;
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const int cmdShareContact = 16;
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const int cmdExportContact = 17;
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const int cmdImportContact = 18;
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const int cmdReboot = 19;
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const int cmdGetBattAndStorage = 20;
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const int cmdDeviceQuery = 22;
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const int cmdSendLogin = 26;
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const int cmdSendStatusReq = 27;
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const int cmdGetChannel = 31;
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const int cmdSetChannel = 32;
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const int cmdGetRadioSettings = 57;
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// Text message types
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const int txtTypePlain = 0;
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const int txtTypeCliData = 1;
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// Repeater request types (for server requests)
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const int reqTypeGetStatus = 0x01;
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const int reqTypeKeepAlive = 0x02;
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const int reqTypeGetTelemetry = 0x03;
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const int reqTypeGetAccessList = 0x05;
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const int reqTypeGetNeighbours = 0x06;
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// Repeater response codes
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const int respServerLoginOk = 0;
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// Response codes (from device)
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const int respCodeOk = 0;
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const int respCodeErr = 1;
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const int respCodeContactsStart = 2;
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const int respCodeContact = 3;
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const int respCodeEndOfContacts = 4;
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const int respCodeSelfInfo = 5;
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const int respCodeSent = 6;
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const int respCodeContactMsgRecv = 7;
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const int respCodeChannelMsgRecv = 8;
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const int respCodeCurrTime = 9;
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const int respCodeNoMoreMessages = 10;
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const int respCodeBattAndStorage = 12;
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const int respCodeDeviceInfo = 13;
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const int respCodeContactMsgRecvV3 = 16;
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const int respCodeChannelMsgRecvV3 = 17;
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const int respCodeChannelInfo = 18;
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const int respCodeRadioSettings = 25;
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// Push codes (async from device)
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const int pushCodeAdvert = 0x80;
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const int pushCodePathUpdated = 0x81;
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const int pushCodeSendConfirmed = 0x82;
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const int pushCodeMsgWaiting = 0x83;
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const int pushCodeLoginSuccess = 0x85;
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const int pushCodeLoginFail = 0x86;
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const int pushCodeStatusResponse = 0x87;
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const int pushCodeLogRxData = 0x88;
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const int pushCodeNewAdvert = 0x8A;
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// Contact/advertisement types
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const int advTypeChat = 1;
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const int advTypeRepeater = 2;
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const int advTypeRoom = 3;
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const int advTypeSensor = 4;
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// Sizes
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const int pubKeySize = 32;
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const int maxPathSize = 64;
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const int pathHashSize = 1;
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const int maxNameSize = 32;
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const int maxFrameSize = 172;
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const int appProtocolVersion = 3;
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// Contact frame offsets
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const int contactPubKeyOffset = 1;
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const int contactTypeOffset = 33;
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const int contactFlagsOffset = 34;
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const int contactPathLenOffset = 35;
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const int contactPathOffset = 36;
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const int contactNameOffset = 100;
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const int contactTimestampOffset = 132;
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const int contactLatOffset = 136;
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const int contactLonOffset = 140;
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const int contactLastmodOffset = 144;
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const int contactFrameSize = 148;
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// Message frame offsets
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const int msgPubKeyOffset = 1;
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const int msgTimestampOffset = 33;
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const int msgFlagsOffset = 37;
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const int msgTextOffset = 38;
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class ParsedContactText {
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final Uint8List senderPrefix;
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final String text;
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const ParsedContactText({
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required this.senderPrefix,
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required this.text,
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});
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}
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ParsedContactText? parseContactMessageText(Uint8List frame) {
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if (frame.isEmpty) return null;
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final code = frame[0];
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if (code != respCodeContactMsgRecv && code != respCodeContactMsgRecvV3) {
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return null;
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}
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// Companion radio layout:
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// [code][snr?][res?][res?][prefix x6][path_len][txt_type][timestamp x4][extra?][text...]
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final isV3 = code == respCodeContactMsgRecvV3;
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final prefixOffset = isV3 ? 4 : 1;
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const prefixLen = 6;
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final txtTypeOffset = prefixOffset + prefixLen + 1;
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final timestampOffset = txtTypeOffset + 1;
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final baseTextOffset = timestampOffset + 4;
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if (frame.length <= baseTextOffset) return null;
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final flags = frame[txtTypeOffset];
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final shiftedType = flags >> 2;
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final rawType = flags;
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final isPlain = shiftedType == txtTypePlain || rawType == txtTypePlain;
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final isCli = shiftedType == txtTypeCliData || rawType == txtTypeCliData;
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if (!isPlain && !isCli) {
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return null;
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}
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var text = readCString(frame, baseTextOffset, frame.length - baseTextOffset).trim();
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if (text.isEmpty && frame.length > baseTextOffset + 4) {
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text =
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readCString(frame, baseTextOffset + 4, frame.length - (baseTextOffset + 4)).trim();
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}
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if (text.isEmpty) return null;
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final senderPrefix = frame.sublist(prefixOffset, prefixOffset + prefixLen);
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return ParsedContactText(senderPrefix: senderPrefix, text: text);
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}
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// Helper to read uint32 little-endian
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int readUint32LE(Uint8List data, int offset) {
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return data[offset] |
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(data[offset + 1] << 8) |
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(data[offset + 2] << 16) |
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(data[offset + 3] << 24);
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}
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// Helper to read uint16 little-endian
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int readUint16LE(Uint8List data, int offset) {
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return data[offset] | (data[offset + 1] << 8);
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}
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// Helper to read int32 little-endian
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int readInt32LE(Uint8List data, int offset) {
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int val = readUint32LE(data, offset);
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if (val >= 0x80000000) val -= 0x100000000;
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return val;
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}
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// Helper to write uint32 little-endian
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void writeUint32LE(Uint8List data, int offset, int value) {
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data[offset] = value & 0xFF;
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data[offset + 1] = (value >> 8) & 0xFF;
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data[offset + 2] = (value >> 16) & 0xFF;
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data[offset + 3] = (value >> 24) & 0xFF;
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}
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// Helper to read null-terminated UTF-8 string
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String readCString(Uint8List data, int offset, int maxLen) {
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int end = offset;
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while (end < offset + maxLen && end < data.length && data[end] != 0) {
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end++;
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}
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try {
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return utf8.decode(data.sublist(offset, end), allowMalformed: true);
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} catch (e) {
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// Fallback to Latin-1 if UTF-8 decoding fails
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return String.fromCharCodes(data.sublist(offset, end));
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}
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}
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// Helper to convert public key to hex string
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String pubKeyToHex(Uint8List pubKey) {
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return pubKey.map((b) => b.toRadixString(16).padLeft(2, '0')).join();
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}
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// Helper to convert hex string to public key
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Uint8List hexToPubKey(String hex) {
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final result = Uint8List(pubKeySize);
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for (int i = 0; i < pubKeySize && i * 2 + 1 < hex.length; i++) {
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result[i] = int.parse(hex.substring(i * 2, i * 2 + 2), radix: 16);
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}
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return result;
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}
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// Build CMD_GET_CONTACTS frame
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Uint8List buildGetContactsFrame({int? since}) {
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if (since != null) {
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final frame = Uint8List(5);
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frame[0] = cmdGetContacts;
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writeUint32LE(frame, 1, since);
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return frame;
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}
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return Uint8List.fromList([cmdGetContacts]);
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}
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// Build CMD_SEND_LOGIN frame
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// Format: [cmd][pub_key x32][password...]\0
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Uint8List buildSendLoginFrame(Uint8List recipientPubKey, String password) {
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final passwordBytes = utf8.encode(password);
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final frame = Uint8List(1 + pubKeySize + passwordBytes.length + 1);
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frame[0] = cmdSendLogin;
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frame.setRange(1, 1 + pubKeySize, recipientPubKey);
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frame.setRange(1 + pubKeySize, 1 + pubKeySize + passwordBytes.length, passwordBytes);
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frame[frame.length - 1] = 0;
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return frame;
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}
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// Build CMD_SEND_STATUS_REQ frame
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// Format: [cmd][pub_key x32]
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Uint8List buildSendStatusRequestFrame(Uint8List recipientPubKey) {
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final frame = Uint8List(1 + pubKeySize);
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frame[0] = cmdSendStatusReq;
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frame.setRange(1, 1 + pubKeySize, recipientPubKey);
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return frame;
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}
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// Build CMD_SEND_TXT_MSG frame (companion_radio format)
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// Format: [cmd][txt_type][attempt][timestamp x4][pub_key_prefix x6][text...]\0
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Uint8List buildSendTextMsgFrame(
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Uint8List recipientPubKey,
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String text, {
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bool forceFlood = false,
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int attempt = 0,
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int? timestampSeconds,
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}) {
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final textBytes = utf8.encode(text);
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final timestamp = timestampSeconds ?? (DateTime.now().millisecondsSinceEpoch ~/ 1000);
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const prefixSize = 6;
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final safeAttempt = forceFlood ? 3 : (attempt & 0xFF);
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final frame = Uint8List(1 + 1 + 1 + 4 + prefixSize + textBytes.length + 1);
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int offset = 0;
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frame[offset++] = cmdSendTxtMsg;
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frame[offset++] = txtTypePlain;
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frame[offset++] = safeAttempt;
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writeUint32LE(frame, offset, timestamp);
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offset += 4;
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frame.setRange(offset, offset + prefixSize, recipientPubKey.sublist(0, prefixSize));
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offset += prefixSize;
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frame.setRange(offset, offset + textBytes.length, textBytes);
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frame[frame.length - 1] = 0; // null terminator
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return frame;
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}
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// Build CMD_SEND_CHANNEL_TXT_MSG frame
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// Format: [cmd][txt_type][channel_idx][timestamp x4][text...]
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Uint8List buildSendChannelTextMsgFrame(int channelIndex, String text) {
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final textBytes = utf8.encode(text);
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final timestamp = DateTime.now().millisecondsSinceEpoch ~/ 1000;
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final frame = Uint8List(1 + 1 + 1 + 4 + textBytes.length + 1);
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frame[0] = cmdSendChannelTxtMsg;
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frame[1] = 0; // TXT_TYPE_PLAIN
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frame[2] = channelIndex;
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writeUint32LE(frame, 3, timestamp);
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frame.setRange(7, 7 + textBytes.length, textBytes);
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frame[frame.length - 1] = 0; // null terminator
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return frame;
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}
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// Build CMD_REMOVE_CONTACT frame
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Uint8List buildRemoveContactFrame(Uint8List pubKey) {
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final frame = Uint8List(1 + pubKeySize);
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frame[0] = cmdRemoveContact;
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frame.setRange(1, 1 + pubKeySize, pubKey);
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return frame;
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}
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// Build CMD_APP_START frame
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// Format: [cmd][reserved x7][app_name...]
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Uint8List buildAppStartFrame({String appName = 'MeshCoreOpen'}) {
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final nameBytes = utf8.encode(appName);
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final frame = Uint8List(8 + nameBytes.length + 1);
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frame[0] = cmdAppStart;
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// bytes 1-7 are reserved (zeros)
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frame.setRange(8, 8 + nameBytes.length, nameBytes);
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frame[frame.length - 1] = 0; // null terminator
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return frame;
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}
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// Build CMD_DEVICE_QUERY frame
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Uint8List buildDeviceQueryFrame({int appVersion = appProtocolVersion}) {
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return Uint8List.fromList([cmdDeviceQuery, appVersion]);
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}
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// Build CMD_GET_DEVICE_TIME frame
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Uint8List buildGetDeviceTimeFrame() {
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return Uint8List.fromList([cmdGetDeviceTime]);
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}
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// Build CMD_GET_BATT_AND_STORAGE frame
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Uint8List buildGetBattAndStorageFrame() {
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return Uint8List.fromList([cmdGetBattAndStorage]);
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}
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// Build CMD_SET_DEVICE_TIME frame
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Uint8List buildSetDeviceTimeFrame(int timestamp) {
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final frame = Uint8List(5);
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frame[0] = cmdSetDeviceTime;
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writeUint32LE(frame, 1, timestamp);
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return frame;
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}
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// Build CMD_SYNC_NEXT_MESSAGE frame
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Uint8List buildSyncNextMessageFrame() {
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return Uint8List.fromList([cmdSyncNextMessage]);
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}
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// Build CMD_GET_CHANNEL frame
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Uint8List buildGetChannelFrame(int channelIndex) {
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return Uint8List.fromList([cmdGetChannel, channelIndex]);
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}
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// Build CMD_SET_CHANNEL frame
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// Format: [cmd][idx][name x32][psk x16]
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Uint8List buildSetChannelFrame(int channelIndex, String name, Uint8List psk) {
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final frame = Uint8List(2 + 32 + 16);
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frame[0] = cmdSetChannel;
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frame[1] = channelIndex;
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// Write name (max 32 bytes UTF-8, null-padded)
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final nameBytes = utf8.encode(name);
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final nameLen = nameBytes.length < 32 ? nameBytes.length : 31; // Reserve 1 byte for null
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for (int i = 0; i < nameLen; i++) {
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frame[2 + i] = nameBytes[i];
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}
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// frame[2 + nameLen] is already 0 (null terminator)
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// Write PSK (16 bytes)
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for (int i = 0; i < 16 && i < psk.length; i++) {
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frame[34 + i] = psk[i];
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}
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return frame;
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}
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// Build CMD_SET_RADIO_PARAMS frame
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// Format: [cmd][freq x4][bw x4][sf][cr]
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// freq: frequency in Hz (300000-2500000)
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// bw: bandwidth in Hz (7000-500000)
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// sf: spreading factor (5-12)
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// cr: coding rate (5-8)
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Uint8List buildSetRadioParamsFrame(int freqHz, int bwHz, int sf, int cr) {
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final frame = Uint8List(11);
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frame[0] = cmdSetRadioParams;
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writeUint32LE(frame, 1, freqHz);
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writeUint32LE(frame, 5, bwHz);
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frame[9] = sf;
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frame[10] = cr;
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return frame;
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}
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// Build CMD_SET_RADIO_TX_POWER frame
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// Format: [cmd][power_dbm]
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Uint8List buildSetRadioTxPowerFrame(int powerDbm) {
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return Uint8List.fromList([cmdSetRadioTxPower, powerDbm]);
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}
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// Build CMD_RESET_PATH frame
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// Format: [cmd][pub_key x32]
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Uint8List buildResetPathFrame(Uint8List pubKey) {
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final frame = Uint8List(1 + pubKeySize);
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frame[0] = cmdResetPath;
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frame.setRange(1, 1 + pubKeySize, pubKey);
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return frame;
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}
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// Build CMD_ADD_UPDATE_CONTACT frame to set custom path
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// Format: [cmd][pub_key x32][type][flags][path_len][path x64][name x32][timestamp x4]
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Uint8List buildUpdateContactPathFrame(
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Uint8List pubKey,
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Uint8List customPath,
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int pathLen, {
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int type = 1, // ADV_TYPE_CHAT
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int flags = 0,
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String name = '',
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}) {
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// Frame size: 1 + 32 + 1 + 1 + 1 + 64 + 32 + 4 = 136 bytes minimum
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final frame = Uint8List(1 + pubKeySize + 1 + 1 + 1 + maxPathSize + maxNameSize + 4);
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int offset = 0;
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frame[offset++] = cmdAddUpdateContact;
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// Public key (32 bytes)
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frame.setRange(offset, offset + pubKeySize, pubKey);
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offset += pubKeySize;
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// Type and flags
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frame[offset++] = type;
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frame[offset++] = flags;
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||||
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||||
// Path length and path data
|
||||
frame[offset++] = pathLen;
|
||||
if (customPath.isNotEmpty && pathLen > 0) {
|
||||
final copyLen = customPath.length < maxPathSize ? customPath.length : maxPathSize;
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frame.setRange(offset, offset + copyLen, customPath.sublist(0, copyLen));
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||||
}
|
||||
offset += maxPathSize;
|
||||
|
||||
// Name (32 bytes, null-padded)
|
||||
if (name.isNotEmpty) {
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||||
final nameBytes = utf8.encode(name);
|
||||
final nameLen = nameBytes.length < maxNameSize ? nameBytes.length : maxNameSize - 1;
|
||||
frame.setRange(offset, offset + nameLen, nameBytes.sublist(0, nameLen));
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||||
}
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||||
offset += maxNameSize;
|
||||
|
||||
// Timestamp (current time)
|
||||
final timestamp = DateTime.now().millisecondsSinceEpoch ~/ 1000;
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||||
writeUint32LE(frame, offset, timestamp);
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||||
|
||||
return frame;
|
||||
}
|
||||
|
||||
// Build CMD_GET_RADIO_SETTINGS frame
|
||||
Uint8List buildGetRadioSettingsFrame() {
|
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return Uint8List.fromList([cmdGetRadioSettings]);
|
||||
}
|
||||
|
||||
// Calculate LoRa airtime for a packet
|
||||
// Based on Semtech SX127x datasheet formula
|
||||
// Returns airtime in milliseconds
|
||||
int calculateLoRaAirtime({
|
||||
required int payloadBytes,
|
||||
required int spreadingFactor,
|
||||
required int bandwidthHz,
|
||||
required int codingRate,
|
||||
int preambleSymbols = 8,
|
||||
bool lowDataRateOptimize = false,
|
||||
bool explicitHeader = true,
|
||||
}) {
|
||||
// Symbol duration (Ts) in milliseconds
|
||||
final symbolDuration = (1 << spreadingFactor) / (bandwidthHz / 1000.0);
|
||||
|
||||
// Preamble time
|
||||
final preambleTime = (preambleSymbols + 4.25) * symbolDuration;
|
||||
|
||||
// Payload symbol count
|
||||
final headerBytes = explicitHeader ? 0 : 20;
|
||||
final crc = 1; // CRC enabled
|
||||
final de = lowDataRateOptimize ? 1 : 0;
|
||||
|
||||
final numerator = 8 * payloadBytes - 4 * spreadingFactor + 28 + 16 * crc - headerBytes;
|
||||
final denominator = 4 * (spreadingFactor - 2 * de);
|
||||
var payloadSymbols = 8 + ((numerator / denominator).ceil()) * (codingRate + 4);
|
||||
|
||||
if (payloadSymbols < 0) {
|
||||
payloadSymbols = 8;
|
||||
}
|
||||
|
||||
final payloadTime = payloadSymbols * symbolDuration;
|
||||
|
||||
return (preambleTime + payloadTime).ceil();
|
||||
}
|
||||
|
||||
// Calculate timeout for a message based on radio settings
|
||||
// Returns timeout in milliseconds
|
||||
int calculateMessageTimeout({
|
||||
required int freqHz,
|
||||
required int bwHz,
|
||||
required int sf,
|
||||
required int cr,
|
||||
required int pathLength,
|
||||
int messageBytes = 100, // Average message size
|
||||
}) {
|
||||
// Calculate airtime for one packet
|
||||
final airtime = calculateLoRaAirtime(
|
||||
payloadBytes: messageBytes,
|
||||
spreadingFactor: sf,
|
||||
bandwidthHz: bwHz,
|
||||
codingRate: cr,
|
||||
lowDataRateOptimize: sf >= 11,
|
||||
);
|
||||
|
||||
if (pathLength < 0) {
|
||||
// Flood mode: Base delay + 16× airtime
|
||||
return 500 + (16 * airtime);
|
||||
} else {
|
||||
// Direct path: Base delay + ((airtime×6 + 250ms)×(hops+1))
|
||||
return 500 + ((airtime * 6 + 250) * (pathLength + 1));
|
||||
}
|
||||
}
|
||||
|
||||
// Build CLI command text message frame (companion_radio format)
|
||||
// Format: [cmd][txt_type][attempt][timestamp x4][pub_key_prefix x6][text...]\0
|
||||
Uint8List buildSendCliCommandFrame(
|
||||
Uint8List repeaterPubKey,
|
||||
String command, {
|
||||
int attempt = 0,
|
||||
}) {
|
||||
final textBytes = utf8.encode(command);
|
||||
final timestamp = DateTime.now().millisecondsSinceEpoch ~/ 1000;
|
||||
const prefixSize = 6;
|
||||
final frame = Uint8List(1 + 1 + 1 + 4 + prefixSize + textBytes.length + 1);
|
||||
int offset = 0;
|
||||
|
||||
frame[offset++] = cmdSendTxtMsg;
|
||||
frame[offset++] = txtTypeCliData;
|
||||
frame[offset++] = attempt & 0xFF;
|
||||
writeUint32LE(frame, offset, timestamp);
|
||||
offset += 4;
|
||||
|
||||
frame.setRange(offset, offset + prefixSize, repeaterPubKey.sublist(0, prefixSize));
|
||||
offset += prefixSize;
|
||||
|
||||
frame.setRange(offset, offset + textBytes.length, textBytes);
|
||||
frame[frame.length - 1] = 0; // null terminator
|
||||
return frame;
|
||||
}
|
||||
Reference in New Issue
Block a user