Update README.md with JSON example

README.md

@@ -8,6 +8,38 @@ Another localisation packet protocol to send/receive localisation data over netw
 
 ### Arduino
 
+### Node-RED
+
+### JSON messages
+
+LocaPack messages are also available in JSON. Example of a Universal GNSS localisation packet:
+
+```json
+{
+  "header": {
+    "protocol_version": 1,
+    "device_id_size": 2,
+    "packet_type": 1,
+    "movement_id_presence_flag": false,
+    "timestamp_presence_flag": true
+  },
+  "sequence_number": 2746,
+  "timestamp": 27850001,
+  "device_id": 237,
+  "payload": [192,49,131,47,66,150,8,165,63,154,153,18,67,164,112,157,63],
+  "universalGnssPacket": {
+    "header": {
+      "altitude_presence_flag": true,
+      "dop_presence_flag": true
+    },
+    "latitude": 43.878116607666016,
+    "longitude": 1.2893245220184326,
+    "altitude": 146.60000610351562,
+    "dop": 1.2300000190734863
+  }
+}
+```
+
 ## License
 
 Locapack is distributed under the GPLv3 license. Please refer to the `LICENSE` file.