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use same logic as meshtastic firmware to obfuscate position

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liamcottle
2024-10-03 09:52:41 +13:00
parent 14c7339ed0
commit ebf4c75bfa
1 changed files with 4 additions and 19 deletions
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23
src/mqtt.js
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@ -791,27 +791,12 @@ client.on("message", async (topic, message) => {
if(position.latitudeI != null && position.longitudeI){
// if bitfield is not available, we are on firmware v2.4 or below
// if configured, truncate position packets to the provided number of decimal places
// if configured, position packets should have their precision reduced
if(bitfield == null && oldFirmwarePositionPrecision != null){
// convert lat/long to decimal as string
// e.g: -123456789 -> -12.3456789
const latitudeString = (position.latitudeI / 10000000).toString();
const longitudeString = (position.longitudeI / 10000000).toString();
// truncate to desired length
const truncatedLatitudeString = PositionUtil.truncateDecimalPlaces(latitudeString, oldFirmwarePositionPrecision);
const truncatedLongitudeString = PositionUtil.truncateDecimalPlaces(longitudeString, oldFirmwarePositionPrecision);
// convert lat/long string back to integer from decimal
// e.g: -12.3456789 -> -123456789
// fixme: sometimes we may get xx.xx99999 recurring, but don't worry about that for now, since we are mangling the precision anyway...
const truncatedLatitudeI = parseInt(parseFloat(truncatedLatitudeString) * 10000000);
const truncatedLongitudeI = parseInt(parseFloat(truncatedLongitudeString) * 10000000);
// update position packet with truncated lat/long
position.latitudeI = truncatedLatitudeI;
position.longitudeI = truncatedLongitudeI;
// adjust precision of latitude and longitude
position.latitudeI = PositionUtil.setPositionPrecision(position.latitudeI, oldFirmwarePositionPrecision);
position.longitudeI = PositionUtil.setPositionPrecision(position.longitudeI, oldFirmwarePositionPrecision);
// todo update position precision on packet to show that it is no longer full precision