fix reading and writing lat lon

src/buffer_reader.js

@@ -48,6 +48,12 @@ class BufferReader {
         return view.getUint32(0, true);
     }
 
+    readInt32LE() {
+        const bytes = this.readBytes(4);
+        const view = new DataView(bytes.buffer);
+        return view.getInt32(0, true);
+    }
+
 }
 
 export default BufferReader;

src/buffer_writer.js

@@ -35,6 +35,13 @@ class BufferWriter {
         this.writeBytes(bytes);
     }
 
+    writeInt32LE(num) {
+        const bytes = new Uint8Array(4);
+        const view = new DataView(bytes.buffer);
+        view.setInt32(0, num, true);
+        this.writeBytes(bytes);
+    }
+
     writeString(string) {
         this.writeBytes(new TextEncoder().encode(string));
     }

src/connection/connection.js

@@ -117,8 +117,8 @@ class Connection extends EventEmitter {
     async sendCommandSetAdvertLatLon(lat, lon) {
         const data = new BufferWriter();
         data.writeByte(Constants.CommandCodes.SetAdvertLatLon);
-        data.writeUInt32LE(lat);
-        data.writeUInt32LE(lon);
+        data.writeInt32LE(lat);
+        data.writeInt32LE(lon);
         await this.sendToRadioFrame(data.toBytes());
     }
 
@@ -223,8 +223,8 @@ class Connection extends EventEmitter {
             txPower: bufferReader.readByte(),
             maxTxPower: bufferReader.readByte(),
             publicKey: bufferReader.readBytes(32),
-            advLat: bufferReader.readUInt32LE(),
-            advLon: bufferReader.readUInt32LE(),
+            advLat: bufferReader.readInt32LE(),
+            advLon: bufferReader.readInt32LE(),
             reserved: bufferReader.readBytes(4),
             radioFreq: bufferReader.readUInt32LE(),
             radioBw: bufferReader.readUInt32LE(),