Made amazing progress on backend

Still need to add the source node information to the messages sent
from the local node in the web browser.

.gitignore

@@ -0,0 +1 @@
+.idea/

main.py

@@ -3,25 +3,154 @@ import meshtastic.serial_interface
 import meshtastic.node
 from pubsub import pub
 from pprint import pprint
+from flask import Flask, request, jsonify, render_template
+from flask_cors import CORS
+from datetime import datetime
+
+from json_utilities import json_friendly_packet, jsonify_dict, render_components
+
+HEXADECIMAL_STRING_CHARS = "0123456789abcdef"
+
+app = Flask(__name__)
+cors = CORS(app, resources={r"/*": {"origins": "*"}})
 
 
-from json_utilities import json_friendly_packet
+packets = []
 
 
 def on_receive(packet):
     packet = json_friendly_packet(packet)
-    print(json.dumps(packet, indent=2))
+    packets.append(packet)
 
 
 def on_connection(topic=pub.AUTO_TOPIC):
     pprint(topic)
 
 
+def is_node_id_valid(node_id: str) -> bool:
+    return node_id.startswith("!") and \
+           len(node_id) == 9 and \
+           len([x for x in node_id.lower() if x in HEXADECIMAL_STRING_CHARS]) == 8
+
+
+def send_message(destination: str, message: str) -> str:
+    packet = {"fromId": "", "toId": destination, "decoded": {"text": message, "portnum": "TEXT_MESSAGE_APP"}}
+    packets.append(packet)
+    print(json.dumps(packets, indent=2))
+    return str(interface.sendText(message, destination, True, False, 3))
+
+
+def save_messages():
+    packets_serialized = json.dumps(packets)
+    try:
+        with open("mesh_msgs.json", "w") as f:
+            f.write(packets_serialized)
+    except Exception as e:
+        print(e)
+
+
+def load_messages():
+    try:
+        with open("mesh_msgs.json") as f:
+            packets_serialized = f.read()
+            packets.append(json.loads(packets_serialized))
+    except Exception as e:
+        print(e)
+
+
+@app.route("/")
+def flask_main():
+    return jsonify({})
+
+
+@app.route("/get_nodes")
+def flast_get_nodes():
+    nodes_list = []
+    for node_key in interface.nodes:
+        try:
+            node_value = interface.nodes[node_key]
+            node_details = {}
+
+            if "snr" in node_value:
+                node_details["snr"] = float(node_value["snr"])
+
+            if "deviceMetrics" in node_value:
+                if "batteryLevel" in node_value["deviceMetrics"]:
+                    node_details["battery_level"] = float(node_value["deviceMetrics"]["batteryLevel"])
+                if "voltage" in node_value["deviceMetrics"]:
+                    node_details["voltage"] = float(node_value["deviceMetrics"]["voltage"])
+
+            if "user" in node_value:
+                if "id" in node_value["user"]:
+                    node_details["node_id"] = node_value["user"]["id"]
+                if "longName" in node_value["user"]:
+                    node_details["node_name"] = node_value["user"]["longName"]
+                if "shortName" in node_value["user"]:
+                    node_details["node_short_name"] = node_value["user"]["shortName"]
+
+            try:
+                node_details["last_heard"] = str(datetime.utcfromtimestamp(float(node_value["lastHeard"])))
+            except Exception as e:
+                print(e)
+
+            nodes_list.append(node_details)
+        except Exception as e:
+            print(e)
+
+    return jsonify(nodes_list)
+
+
+@app.route("/get_messages")
+def flask_get_messages():
+    # print(json.dumps(packets, indent=2))
+
+    messages_list = []
+
+    for message in packets:
+        message_details = {}
+        if "fromId" in message:
+            message_details["source"] = message["fromId"]
+        if "toId" in message:
+            message_details["destination"] = message["toId"]
+        if "rxSnr" in message:
+            message_details["snr"] = message["rxSnr"]
+        if "rxRssi" in message:
+            message_details["rssi"] = message["rxRssi"]
+        if "decoded" in message:
+            if "text" in message["decoded"]:
+                message_details["message"] = message["decoded"]["text"]
+            if "portnum" in message["decoded"]:
+                message_details["portnum"] = message["decoded"]["portnum"]
+        messages_list.append(message_details)
+    return jsonify(messages_list)
+
+
+@app.route("/send_message", methods=['POST'])
+def flask_send_message():
+    if request.method == 'POST':
+        if "destination" in request.json and "message" in request.json:
+            destination, message = request.json["destination"], request.json["message"]
+            if type(destination) != str or type(message) != str:
+                return jsonify({"error": "destination or message invalid"})
+            if not is_node_id_valid(destination):
+                return jsonify({"error": "destination {} not valid".format(destination)})
+            result = send_message(destination, message)
+            return jsonify({"result": result})
+        return jsonify({"error": "destination or message not in request"})
+    return jsonify({"error": "use POST requests"})
+
+
 pub.subscribe(on_receive, "meshtastic.receive")
 pub.subscribe(on_connection, "meshtastic.connection.established")
 
 interface = meshtastic.serial_interface.SerialInterface()
 
 if __name__ == '__main__':
-    node: meshtastic.Node = interface.localNode
-    node.showInfo()
+    try:
+        load_messages()
+        node: meshtastic.Node = interface.localNode
+        app.run(port=5643)
+    except Exception as e:
+        print(e)
+        print("Got keyboard interrupt, exiting application")
+        save_messages()