add port gaurd

Author: tomvictor

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "iotcore"
-version = "0.2.0"
+version = "0.2.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

README.md

@@ -100,10 +100,25 @@ def pub():
 
 Then add iotcore to the django apps as below in the settings.py file of your project
 ```python
-INSTALLED_APPS = [
-    "Other Apps here",
-    "iotcore.djangoiot"
-]
+from django.http import JsonResponse
+from iotcore import IotCore
+
+iot = IotCore()
+iot.background_loop_forever()
+
+
+def mqtt_callback(data):
+    print(f"Django >: {data}")
+
+
+def subscribe(request):
+    iot.subscribe("iot", mqtt_callback)
+    return JsonResponse({"response": "subscribed"})
+
+
+def publish(request):
+    iot.publish("iot", "demo")
+    return JsonResponse({"response": "published"})
 ```
 
 Now Connect to mqtt broker on localhost  

docs/index.md

@@ -100,10 +100,25 @@ def pub():
 
 Then add iotcore to the django apps as below in the settings.py file of your project
 ```python
-INSTALLED_APPS = [
-    "Other Apps here",
-    "iotcore.djangoiot"
-]
+from django.http import JsonResponse
+from iotcore import IotCore
+
+iot = IotCore()
+iot.background_loop_forever()
+
+
+def mqtt_callback(data):
+    print(f"Django >: {data}")
+
+
+def subscribe(request):
+    iot.subscribe("iot", mqtt_callback)
+    return JsonResponse({"response": "subscribed"})
+
+
+def publish(request):
+    iot.publish("iot", "demo")
+    return JsonResponse({"response": "published"})
 ```
 
 Now Connect to mqtt broker on localhost  

examples/django/develop/settings.py

@@ -37,7 +37,6 @@
     "django.contrib.sessions",
     "django.contrib.messages",
     "django.contrib.staticfiles",
-    # "iotcore.djangoiot", # Broker only
     "iot"
 ]
 

iotcore/djangoiot/apps.py

@@ -6,14 +6,13 @@
 class IotConfig(AppConfig):
     default_auto_field = "django.db.models.BigAutoField"
     name = "iotcore.djangoiot"
-    iotcore_instance = None
 
-    def ready(self):
-        server_status = os.environ.get("MQTT_SERVER_RUNNING", None)
-        if server_status is None:
-            print("Starting MQTT server!")
-            os.environ["MQTT_SERVER_RUNNING"] = "true"
-            self.iotcore_instance = IotCore()
-            self.iotcore_instance.background_loop_forever()
-        else:
-            print("Server already running!")
+    # def ready(self):
+    #     server_status = os.environ.get("MQTT_SERVER_RUNNING", None)
+    #     if server_status is None:
+    #         print("Starting MQTT server!")
+    #         os.environ["MQTT_SERVER_RUNNING"] = "true"
+    #         iot = IotCore()
+    #         iot.background_loop_forever()
+    #     else:
+    #         print("Server already running!")

src/core.rs

@@ -24,13 +24,24 @@ pub struct IotCoreRs {
 }
 
 
+fn port_available(port: u16) -> bool {
+    match TcpListener::bind(("127.0.0.1", port)) {
+        Ok(_) => { true }
+        Err(_) => {
+            println!("Port not available");
+            false
+        }
+    }
+}
+
 #[pymethods]
 impl IotCoreRs {
     #[new]
     fn new(host: &str, port: u16, callback: PyObject) -> Self {
         let (host, port) = {
             if host == "localhost" {
-                start_mqtt_broker();
+                let port_status = port_available(1883);
+                if port_status { start_mqtt_broker() };
                 ("localhost", 1883)
             } else {
                 (host, port)
@@ -73,13 +84,6 @@ impl IotCoreRs {
         Self { client, callback, tx, rx: rx_arc }
     }
 
-    fn is_port_available(&mut self, port: u16) -> bool {
-        match TcpListener::bind(("127.0.0.1", port)) {
-            Ok(_) => { true }
-            Err(_) => { false }
-        }
-    }
-
     fn publish(&mut self, topic: &str, data: &str) -> PyResult<()> {
         let topic_to_be_subscribed = topic.to_owned();
         self.client