[ { "id": "aprs_tab", "type": "tab", "label": "LoRa-APRS", "disabled": false, "info": "Receives iGate syslog over UDP, parses it, writes to InfluxDB." }, { "id": "udp_in", "type": "udp in", "z": "aprs_tab", "name": "iGate syslog UDP 1234", "iface": "", "port": "1234", "ipv": "udp4", "multicast": "false", "group": "", "datatype": "utf8", "x": 160, "y": 140, "wires": [ [ "parser" ] ] }, { "id": "parser", "type": "function", "z": "aprs_tab", "name": "SYSLOG PARSER", "func": "// ============================================================================\n// LoRa-APRS syslog parser \u2014 Node-RED \"function\" node\n// ----------------------------------------------------------------------------\n// IN : msg.payload = ONE raw RFC5424 syslog line from your iGate\n// (delivered by the \"udp in\" node listening on your chosen port)\n// OUT : msg.payload = InfluxDB line protocol (one row per packet)\n// msg.headers = the InfluxDB auth + content-type for the write\n// -> wire this to an \"http request\" node that POSTs to /api/v2/write\n//\n// Lines whose syslog HOSTNAME is not a valid CALLSIGN-SSID are dropped\n// (return null) so junk / spoofed traffic never reaches the database.\n//\n// >>> EDIT THE THREE CONFIG VALUES BELOW <<<\n// ============================================================================\n\nconst INFLUX_TOKEN = \"YOUR_INFLUX_TOKEN\"; // InfluxDB API token (read/write on the bucket)\nconst ORG = \"aprs\"; // your InfluxDB organisation name\nconst BUCKET = \"N0CALL-10\"; // your gateway callsign = your bucket name\n\n// --- the raw syslog line -----------------------------------------------------\nconst msgRaw = msg.payload.toString();\n\nlet data = { callsign:\"unknown\", category:\"SYSTEM\", rssi:0, snr:0, freq_offset:0,\n battery:0, altitude:0, lat:0.0, lon:0.0, message:\"\", raw:msgRaw };\n\n// --- 1. category + HEARD-station callsign (from the line prefix) -------------\n// RX = heard over RF, TX = transmitted by us, TCPIP = came via the internet.\nif (msgRaw.includes(\",TCPIP,\")) {\n data.category = \"TCPIP\";\n const m = msgRaw.match(/([A-Z0-9]+-[0-9]{1,2})>/); if (m) data.callsign = m[1];\n} else if (msgRaw.includes(\" - RX / \")) {\n data.category = \"RX\";\n const m = msgRaw.match(/RX \\/ (?:GPS \\/ )?([A-Z0-9]+-[0-9]{1,2})/); if (m) data.callsign = m[1];\n} else if (msgRaw.includes(\" - TX / \")) {\n data.category = \"TX\";\n const m = msgRaw.match(/TX \\/ ([A-Z0-9]+-[0-9]{1,2})/); if (m) data.callsign = m[1];\n}\n\n// --- 2. telemetry parsed from the suffix patterns ---------------------------\nlet t;\nif (t = msgRaw.match(/\\/ (-?\\d+)dBm/)) data.rssi = parseFloat(t[1]); // signal strength\nif (t = msgRaw.match(/\\/ (-?\\d+\\.\\d+)dB/)) data.snr = parseFloat(t[1]); // signal-to-noise\nif (t = msgRaw.match(/\\/ (-?\\d+)Hz/)) data.freq_offset = parseFloat(t[1]); // frequency error\nif (t = msgRaw.match(/Batt=(\\d+\\.\\d+)V/)) data.battery = parseFloat(t[1]); // battery (heard stns)\nif (t = msgRaw.match(/\\/A=(\\d+)/)) data.altitude = parseInt(t[1]); // altitude\n\n// --- 3. coordinates \u2014 ANCHORED to the decoded \" LATN / LONE \" structure -----\n// The \" / \" separator is the key: relayed/third-party positions lack it,\n// so they are skipped and can never mis-pin your fixed gateway on the map.\nconst coord = msgRaw.match(/(\\d+\\.\\d+)([NS]) \\/ ([+-]?\\d+\\.\\d+)([EW])/);\nif (coord) {\n let la = parseFloat(coord[1]); if (coord[2] === \"S\") la = -la;\n let lo = parseFloat(coord[3]); if (coord[4] === \"W\") lo = -lo;\n data.lat = la; data.lon = lo;\n}\n// legacy APRS DDMM.mm safety net: |lat| > 90 can't be degrees -> convert.\nfunction ddmm(v){ const s=v<0?-1:1, a=Math.abs(v), d=Math.floor(a/100); return s*(d+(a-d*100)/60); }\nif (Math.abs(data.lat) > 90) { data.lat = ddmm(data.lat); data.lon = ddmm(data.lon); }\n\n// --- 4. enrichment: tocall / path / digipeated / distance_km ----------------\nlet tocall=\"\", path=\"\", digipeated=0, distance_km=0;\nif (data.category === \"TX\") {\n const fr = msgRaw.match(/TX \\/ [A-Z0-9-]+>([A-Z0-9-]+),([^:]*):/);\n if (fr) { tocall = fr[1]; path = fr[2]; }\n} else if (data.category === \"RX\") {\n const hdr = msgRaw.match(/RX \\/ (?:GPS \\/ )?[A-Z0-9-]+ \\/ (.*?) \\/ -?\\d+dBm/);\n if (hdr) {\n const to = hdr[1].match(/\\b(AP[A-Z0-9]+)\\b/); if (to) tocall = to[1];\n path = hdr[1].replace(/^AP[A-Z0-9]+[,\\s]*/, \"\")\n .replace(/\\s*\\/\\s*/g, \" \").replace(/^-\\s*|\\s*-\\s*$/g, \"\").trim();\n }\n const dm = msgRaw.match(/[EW] \\/ (\\d+(?:\\.\\d+)?)km/); if (dm) distance_km = parseFloat(dm[1]);\n}\nif (path.includes(\"*\")) digipeated = 1; // a \"*\" in the path = the packet was digipeated\n\n// --- 5. message content (free text after the last \"/\") ----------------------\nconst parts = msgRaw.split(\"/\"); data.message = parts[parts.length - 1].trim();\n\n// --- 6. GATEWAY = RFC5424 syslog HOSTNAME (3rd token) = YOUR iGate -----------\n// This is the receiving station. We sanity-check its shape and drop junk.\nlet gateway = \"unknown\";\nconst gw = msgRaw.match(/^<\\d+>\\d+ - ([A-Z0-9]+-[0-9]{1,2}) /);\nif (gw) gateway = gw[1];\nif (!/^[A-Z0-9]{3,7}-\\d{1,2}$/.test(gateway)) return null;\n\n// --- 7. build InfluxDB line protocol ----------------------------------------\n// ALL numerics are written WITHOUT an \"i\" suffix, i.e. as FLOATS. This is\n// deliberate: the Grafana queries do float() maths, and InfluxDB refuses to\n// mix int + float in the same field. Keep everything float and you never\n// hit a \"field type conflict\".\nfunction et(s){ return String(s).replace(/[ ,=]/g, \"\\\\$&\"); } // escape tag value\nfunction ef(s){ return '\"' + String(s).replace(/\\\\/g,\"\\\\\\\\\").replace(/\"/g,'\\\\\"') + '\"'; } // escape string field\n\nconst tags = `callsign=${et(data.callsign)},category=${et(data.category)},gateway=${et(gateway)}`;\nconst fields = [\n `rssi=${data.rssi}`, `snr=${data.snr}`, `freq_offset=${data.freq_offset}`,\n `battery=${data.battery}`, `altitude=${data.altitude}`, `lat=${data.lat}`, `lon=${data.lon}`,\n `digipeated=${digipeated}`, `distance_km=${distance_km}`,\n `message=${ef(data.message)}`, `raw=${ef(data.raw)}`, `tocall=${ef(tocall)}`, `path=${ef(path)}`\n].join(\",\");\n\nmsg.payload = `aprs_syslog,${tags} ${fields} ${Date.now()}`;\nmsg.headers = {\n \"Authorization\": \"Token \" + INFLUX_TOKEN,\n \"Content-Type\": \"text/plain; charset=utf-8\"\n};\n// the http request node URL uses {{ORG}}/{{BUCKET}} via these (see the flow / guide):\nmsg.org = ORG;\nmsg.bucket = BUCKET;\nreturn msg;\n", "outputs": 1, "timeout": 0, "noerr": 0, "initialize": "", "finalize": "", "libs": [], "x": 410, "y": 140, "wires": [ [ "influx_write", "dbg" ] ] }, { "id": "influx_write", "type": "http request", "z": "aprs_tab", "name": "InfluxDB write", "method": "POST", "ret": "txt", "paytoqs": "ignore", "url": "http://INFLUX_HOST:8086/api/v2/write?org={{org}}&bucket={{bucket}}&precision=ms", "tls": "", "persist": false, "proxy": "", "insecureHTTPParser": false, "authType": "", "senderr": false, "headers": [], "x": 660, "y": 120, "wires": [ [ "dbg_write" ] ] }, { "id": "dbg", "type": "debug", "z": "aprs_tab", "name": "line protocol", "active": false, "tosidebar": true, "console": false, "tostatus": false, "complete": "payload", "targetType": "msg", "statusVal": "", "statusType": "auto", "x": 660, "y": 180, "wires": [] }, { "id": "dbg_write", "type": "debug", "z": "aprs_tab", "name": "write result", "active": true, "tosidebar": true, "console": false, "tostatus": false, "complete": "payload", "targetType": "msg", "statusVal": "", "statusType": "auto", "x": 890, "y": 120, "wires": [] } ]