add cli flag to limit position precision to x decimal places for v2.4 firmware and older

src/utils/position_util.js

@@ -0,0 +1,44 @@
+class PositionUtil {
+
+    /**
+     * Truncates the provided latitude or longitude to a maximum of x decimal places
+     * e.g: 12.3456789 with 2 decimal places would be 12.34
+     * @param latitudeOrLongitudeString e.g: 12.3456789
+     * @param numberOfDecimalPlaces how many decimal places to allow in the result
+     * @returns {*|string|null}
+     */
+    static truncateDecimalPlaces(latitudeOrLongitudeString, numberOfDecimalPlaces) {
+
+        // ensure value not null
+        if(latitudeOrLongitudeString == null){
+            return null;
+        }
+
+        // split into left and right side of decimal point
+        // e.g: -12.3456789 -> [-12, 3456789]
+        var [ leftOfDecimalPoint, rightOfDecimalPoint ] = latitudeOrLongitudeString.split(".");
+
+        // check if decimal places available
+        if(rightOfDecimalPoint != null){
+
+            // truncate decimal places to desired length
+            rightOfDecimalPoint = rightOfDecimalPoint.substring(0, numberOfDecimalPlaces);
+
+            // return modified position with decimal places, if available
+            if(rightOfDecimalPoint.length > 0){
+                return [ leftOfDecimalPoint, rightOfDecimalPoint ].join(".");
+            }
+
+            // no decimal places available anymore, return left side without dot
+            return leftOfDecimalPoint;
+
+        }
+
+        // decimal places not available, return position as is
+        return latitudeOrLongitudeString;
+
+    }
+
+}
+
+module.exports = PositionUtil;

src/utils/position_util.test.js

@@ -0,0 +1,18 @@
+const PositionUtil = require("./position_util");
+
+test('can truncate string position to provided decimal places', () => {
+    expect(PositionUtil.truncateDecimalPlaces("12.3456789", 0)).toBe("12");
+    expect(PositionUtil.truncateDecimalPlaces("12.3456789", 1)).toBe("12.3");
+    expect(PositionUtil.truncateDecimalPlaces("12.3456789", 2)).toBe("12.34");
+    expect(PositionUtil.truncateDecimalPlaces("12.3456789", 3)).toBe("12.345");
+    expect(PositionUtil.truncateDecimalPlaces("12.3456789", 4)).toBe("12.3456");
+    expect(PositionUtil.truncateDecimalPlaces("12.3456789", 5)).toBe("12.34567");
+    expect(PositionUtil.truncateDecimalPlaces("12.3456789", 6)).toBe("12.345678");
+    expect(PositionUtil.truncateDecimalPlaces("12.3456789", 7)).toBe("12.3456789");
+    expect(PositionUtil.truncateDecimalPlaces("12.3", 7)).toBe("12.3");
+    expect(PositionUtil.truncateDecimalPlaces(null, 2)).toBe(null);
+    expect(PositionUtil.truncateDecimalPlaces("", 2)).toBe("");
+    expect(PositionUtil.truncateDecimalPlaces("12", 2)).toBe("12");
+    expect(PositionUtil.truncateDecimalPlaces("123", 2)).toBe("123");
+    expect(PositionUtil.truncateDecimalPlaces("1234.", 2)).toBe("1234");
+});