Node-RED flows to send Home Assistant device tracker data to Owntracks via MQTT or HTTP - https://blog.tiga.tech/posts/selfhost-location-history

flow-http.json

[
    {
        "id": "978f06ed.f5189",
        "type": "trigger-state",
        "z": "90f1f83a.381b38",
        "name": "Example Device Tracker",
        "server": "4bc0b8a8.1c9238",
        "version": 4,
        "inputs": 1,
        "outputs": 2,
        "exposeAsEntityConfig": "",
        "entityId": "device_tracker.DEVICE_HERE",
        "entityIdType": "exact",
        "debugEnabled": false,
        "constraints": [],
        "customOutputs": [],
        "outputInitially": true,
        "stateType": "str",
        "enableInput": true,
        "exposeToHomeAssistant": false,
        "haConfig": [
            {
                "property": "name",
                "value": ""
            },
            {
                "property": "icon",
                "value": ""
            }
        ],
        "x": 130,
        "y": 520,
        "wires": [
            [
                "9b4e4feb99a9b7d4"
            ],
            []
        ]
    },
    {
        "id": "9b4e4feb99a9b7d4",
        "type": "change",
        "z": "90f1f83a.381b38",
        "name": "set vars",
        "rules": [
            {
                "t": "set",
                "p": "device_battery",
                "pt": "msg",
                "to": "sensor.DEVICE_HERE_battery_level",
                "tot": "str"
            },
            {
                "t": "set",
                "p": "tracker_id",
                "pt": "msg",
                "to": "TRACKER_ID_HERE",
                "tot": "str"
            },
            {
                "t": "set",
                "p": "user_id",
                "pt": "msg",
                "to": "USER_HERE",
                "tot": "str"
            },
            {
                "t": "set",
                "p": "device_id",
                "pt": "msg",
                "to": "DEVICE_SHORT_ID_HERE",
                "tot": "str"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 320,
        "y": 520,
        "wires": [
            [
                "5b3dc93c.892c5"
            ]
        ]
    },
    {
        "id": "5b3dc93c.892c5",
        "type": "delay",
        "z": "90f1f83a.381b38",
        "name": "rate limit 1 per 10s",
        "pauseType": "timed",
        "timeout": "5",
        "timeoutUnits": "seconds",
        "rate": "1",
        "nbRateUnits": "10",
        "rateUnits": "second",
        "randomFirst": "1",
        "randomLast": "5",
        "randomUnits": "seconds",
        "drop": true,
        "allowrate": false,
        "outputs": 1,
        "x": 510,
        "y": 540,
        "wires": [
            [
                "301f763b.98140a"
            ]
        ]
    },
    {
        "id": "301f763b.98140a",
        "type": "function",
        "z": "90f1f83a.381b38",
        "name": "device data to owntracks json",
        "func": "const globalHomeAssistant = global.get('homeassistant');\n\n// Get timestamp as epoch format\nconst timestamp = Math.floor(Date.now() / 1000);\n\n// Entity ID of battery level sensor from the mobile app\nconst battery_level = globalHomeAssistant.homeAssistant.states[msg.device_battery].state;\n\n// Get tracker ID (2 chars)\nconst tracker_id = msg.tracker_id;\n\n// Set the connection type. Hardcoded to wireless since it's an unimportant metric.\nconst connection_type = 'w';\n\n// Get device GPS accuracy\nconst gps_accuracy = msg.data.event.new_state.attributes.gps_accuracy;\n\n// Get device vertical accuracy\nconst vertical_accuracy = msg.data.event.new_state.attributes.vertical_accuracy;\n\n// Get device altitude\nconst altitude = msg.data.event.new_state.attributes.altitude;\n\n// Get device latitude\nconst latitude = msg.data.event.new_state.attributes.latitude;\n\n// Get device longitude\nconst longitude = msg.data.event.new_state.attributes.longitude;\n\n// Get device speed\n// The device_tracker entity from the HASS mobile app uses m/s as the unit\n// for the speed attribute, so we multiply by 3.6 to convert to the expected km/h\nconst velocity = msg.data.event.new_state.attributes.speed * 3.6;\n\n// Get device course\nconst course = msg.data.event.new_state.attributes.course;\n\n// Construct msg.payload as a JavaScript object\nmsg.payload = {\n    _type: 'location',\n    acc: gps_accuracy,\n    alt: altitude,\n    batt: battery_level,\n    conn: connection_type,\n    lat: latitude,\n    lon: longitude,\n    tid: tracker_id,\n    tst: timestamp,\n    vac: vertical_accuracy,\n    vel: velocity,\n    cog: course,\n};\n\n// Convert msg.payload to minified JSON\nmsg.payload = JSON.stringify(msg.payload);\n\nreturn msg;\n",
        "outputs": 1,
        "timeout": "",
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 770,
        "y": 540,
        "wires": [
            [
                "8c852383ada7d61a"
            ]
        ]
    },
    {
        "id": "8c852383ada7d61a",
        "type": "http request",
        "z": "90f1f83a.381b38",
        "name": "POST to Owntracks",
        "method": "POST",
        "ret": "txt",
        "paytoqs": "ignore",
        "url": "http://OWNTRACKS_URL_HERE/pub",
        "tls": "",
        "persist": false,
        "proxy": "",
        "insecureHTTPParser": false,
        "authType": "",
        "senderr": false,
        "headers": [
            {
                "keyType": "other",
                "keyValue": "X-Limit-U",
                "valueType": "msg",
                "valueValue": "user_id"
            },
            {
                "keyType": "other",
                "keyValue": "X-Limit-D",
                "valueType": "msg",
                "valueValue": "device_id"
            }
        ],
        "x": 1040,
        "y": 540,
        "wires": [
            []
        ]
    },
    {
        "id": "4bc0b8a8.1c9238",
        "type": "server",
        "name": "Home Assistant",
        "version": 5,
        "addon": true,
        "rejectUnauthorizedCerts": true,
        "ha_boolean": "y|yes|true|on|home|open",
        "connectionDelay": true,
        "cacheJson": true,
        "heartbeat": false,
        "heartbeatInterval": 30,
        "areaSelector": "friendlyName",
        "deviceSelector": "friendlyName",
        "entitySelector": "friendlyName",
        "statusSeparator": "at: ",
        "statusYear": "hidden",
        "statusMonth": "short",
        "statusDay": "numeric",
        "statusHourCycle": "h23",
        "statusTimeFormat": "h:m",
        "enableGlobalContextStore": true
    }
]

flow-mqtt.json

[
    {
        "id": "9308b54f7f75ffdd",
        "type": "trigger-state",
        "z": "90f1f83a.381b38",
        "name": "Example Device Tracker",
        "server": "4bc0b8a8.1c9238",
        "version": 4,
        "inputs": 1,
        "outputs": 2,
        "exposeAsEntityConfig": "",
        "entityId": "device_tracker.DEVICE_HERE",
        "entityIdType": "exact",
        "debugEnabled": false,
        "constraints": [],
        "customOutputs": [],
        "outputInitially": true,
        "stateType": "str",
        "enableInput": true,
        "exposeToHomeAssistant": false,
        "haConfig": [
            {
                "property": "name",
                "value": ""
            },
            {
                "property": "icon",
                "value": ""
            }
        ],
        "x": 130,
        "y": 740,
        "wires": [
            [
                "3595ec02e60879f2"
            ],
            []
        ]
    },
    {
        "id": "3595ec02e60879f2",
        "type": "change",
        "z": "90f1f83a.381b38",
        "name": "set vars",
        "rules": [
            {
                "t": "set",
                "p": "device_topic",
                "pt": "msg",
                "to": "owntracks/USER_HERE/DEVICE_SHORT_ID_HERE",
                "tot": "str"
            },
            {
                "t": "set",
                "p": "device_battery",
                "pt": "msg",
                "to": "sensor.DEVICE_HERE_battery_level",
                "tot": "str"
            },
            {
                "t": "set",
                "p": "tracker_id",
                "pt": "msg",
                "to": "TRACKER_ID_HERE",
                "tot": "str"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 320,
        "y": 740,
        "wires": [
            [
                "5379fbde12ca52cd"
            ]
        ]
    },
    {
        "id": "5379fbde12ca52cd",
        "type": "delay",
        "z": "90f1f83a.381b38",
        "name": "rate limit 1 per 10s",
        "pauseType": "timed",
        "timeout": "5",
        "timeoutUnits": "seconds",
        "rate": "1",
        "nbRateUnits": "10",
        "rateUnits": "second",
        "randomFirst": "1",
        "randomLast": "5",
        "randomUnits": "seconds",
        "drop": true,
        "allowrate": false,
        "outputs": 1,
        "x": 510,
        "y": 760,
        "wires": [
            [
                "7d7e5526a1b19941"
            ]
        ]
    },
    {
        "id": "7d7e5526a1b19941",
        "type": "function",
        "z": "90f1f83a.381b38",
        "name": "device data to owntracks json",
        "func": "const globalHomeAssistant = global.get('homeassistant');\n\n// Get timestamp as epoch format\nconst timestamp = Math.floor(Date.now() / 1000);\n\n// Entity ID of battery level sensor from the mobile app\nconst battery_level = globalHomeAssistant.homeAssistant.states[msg.device_battery].state;\n\n// Get tracker ID (2 chars)\nconst tracker_id = msg.tracker_id;\n\n// Set the connection type. Hardcoded to wireless since it's an unimportant metric.\nconst connection_type = 'w';\n\n// Get device GPS accuracy\nconst gps_accuracy = msg.data.event.new_state.attributes.gps_accuracy;\n\n// Get device vertical accuracy\nconst vertical_accuracy = msg.data.event.new_state.attributes.vertical_accuracy;\n\n// Get device altitude\nconst altitude = msg.data.event.new_state.attributes.altitude;\n\n// Get device latitude\nconst latitude = msg.data.event.new_state.attributes.latitude;\n\n// Get device longitude\nconst longitude = msg.data.event.new_state.attributes.longitude;\n\n// Get device speed\n// The device_tracker entity from the HASS mobile app uses m/s as the unit\n// for the speed attribute, so we multiply by 3.6 to convert to the expected km/h\nconst velocity = msg.data.event.new_state.attributes.speed * 3.6;\n\n// Get device course\nconst course = msg.data.event.new_state.attributes.course;\n\n// Construct msg.payload as a JavaScript object\nmsg.payload = {\n    _type: 'location',\n    acc: gps_accuracy,\n    alt: altitude,\n    batt: battery_level,\n    conn: connection_type,\n    lat: latitude,\n    lon: longitude,\n    tid: tracker_id,\n    tst: timestamp,\n    vac: vertical_accuracy,\n    vel: velocity,\n    cog: course,\n};\n\n// Convert msg.payload to minified JSON\nmsg.payload = JSON.stringify(msg.payload);\n\nreturn msg;\n",
        "outputs": 1,
        "timeout": "",
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 770,
        "y": 760,
        "wires": [
            [
                "7173b8da1b8076fb"
            ]
        ]
    },
    {
        "id": "7173b8da1b8076fb",
        "type": "change",
        "z": "90f1f83a.381b38",
        "name": "set topic",
        "rules": [
            {
                "t": "set",
                "p": "topic",
                "pt": "msg",
                "to": "device_topic",
                "tot": "msg"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 1000,
        "y": 760,
        "wires": [
            [
                "34a06109bd9fea34"
            ]
        ]
    },
    {
        "id": "34a06109bd9fea34",
        "type": "mqtt out",
        "z": "90f1f83a.381b38",
        "name": "mqtt owntracks",
        "topic": "",
        "qos": "0",
        "retain": "",
        "respTopic": "",
        "contentType": "",
        "userProps": "",
        "correl": "",
        "expiry": "",
        "broker": "16253ac6.f8ef75",
        "x": 1180,
        "y": 760,
        "wires": []
    },
    {
        "id": "4bc0b8a8.1c9238",
        "type": "server",
        "name": "Home Assistant",
        "version": 5,
        "addon": true,
        "rejectUnauthorizedCerts": true,
        "ha_boolean": "y|yes|true|on|home|open",
        "connectionDelay": true,
        "cacheJson": true,
        "heartbeat": false,
        "heartbeatInterval": 30,
        "areaSelector": "friendlyName",
        "deviceSelector": "friendlyName",
        "entitySelector": "friendlyName",
        "statusSeparator": "at: ",
        "statusYear": "hidden",
        "statusMonth": "short",
        "statusDay": "numeric",
        "statusHourCycle": "h23",
        "statusTimeFormat": "h:m",
        "enableGlobalContextStore": true
    },
    {
        "id": "16253ac6.f8ef75",
        "type": "mqtt-broker",
        "name": "MQTT hass",
        "broker": "core-mosquitto",
        "port": "1883",
        "clientid": "nodered",
        "autoConnect": true,
        "usetls": false,
        "compatmode": false,
        "protocolVersion": "4",
        "keepalive": "60",
        "cleansession": true,
        "autoUnsubscribe": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "birthMsg": {},
        "closeTopic": "",
        "closeQos": "0",
        "closePayload": "",
        "closeMsg": {},
        "willTopic": "",
        "willQos": "0",
        "willPayload": "",
        "willMsg": {},
        "userProps": "",
        "sessionExpiry": ""
    }
]

transform.js

// NOTICE: You don't need this file, it's just here for reference as it's a core part of the logic in these flows.
const globalHomeAssistant = global.get('homeassistant');

// Get timestamp as epoch format
const timestamp = Math.floor(Date.now() / 1000);

// Entity ID of battery level sensor from the mobile app
const battery_level = globalHomeAssistant.homeAssistant.states[msg.device_battery].state;

// Get tracker ID (2 chars)
const tracker_id = msg.tracker_id;

// Set the connection type. Hardcoded to wireless since it's an unimportant metric.
const connection_type = 'w';

// Get device GPS accuracy
const gps_accuracy = msg.data.event.new_state.attributes.gps_accuracy;

// Get device vertical accuracy
const vertical_accuracy = msg.data.event.new_state.attributes.vertical_accuracy;

// Get device altitude
const altitude = msg.data.event.new_state.attributes.altitude;

// Get device latitude
const latitude = msg.data.event.new_state.attributes.latitude;

// Get device longitude
const longitude = msg.data.event.new_state.attributes.longitude;

// Get device speed
// The device_tracker entity from the HASS mobile app uses m/s as the unit
// for the speed attribute, so we multiply by 3.6 to convert to the expected km/h
const velocity = msg.data.event.new_state.attributes.speed * 3.6;

// Get device course
const course = msg.data.event.new_state.attributes.course;

// Construct msg.payload as a JavaScript object
msg.payload = {
    _type: 'location',
    acc: gps_accuracy,
    alt: altitude,
    batt: battery_level,
    conn: connection_type,
    lat: latitude,
    lon: longitude,
    tid: tracker_id,
    tst: timestamp,
    vac: vertical_accuracy,
    vel: velocity,
    cog: course,
};

// Convert msg.payload to minified JSON
msg.payload = JSON.stringify(msg.payload);

return msg;