Added SSL support and certifi to Dockerfile

Dockerfile

@@ -3,7 +3,7 @@ FROM python:3.6.13-alpine3.12
 RUN apk add --no-cache gammu-dev
 
 RUN apk add --no-cache --virtual .build-deps gcc musl-dev \
-     && pip install python-gammu paho-mqtt \
+     && pip install python-gammu paho-mqtt certifi\
      && apk del .build-deps gcc musl-dev
 
 WORKDIR /app

README.md

@@ -21,13 +21,14 @@ docker run \
     --device=/dev/ttyUSB0:/dev/mobile \
     -e PIN="1234" \
     -e HOST="192.168.1.x" \
-    -e PORT=1883 \
+    -e PORT=8883 \
     -e PREFIX="sms2mqtt" \
     -e CLIENTID="sms2mqttclid" \
     -e USER="usr" \
     -e PASSWORD="pass" \
+    -e USETLS=true \
     domochip/sms2mqtt
-```
+```  
 For Docker-Compose, use the following yaml:
 
 ```yaml
@@ -37,15 +38,16 @@ services:
     container_name: sms2mqtt
     image: domochip/sms2mqtt
     devices:
-    - /dev/serial/by-id/usb-HUAWEI_HUAWEI_Mobile-if00-port0:/dev/mobile
+      - /dev/serial/by-id/usb-HUAWEI_HUAWEI_Mobile-if00-port0:/dev/mobile
     environment:
-    - PIN=1234
-    - HOST=10.0.0.2
-    - PORT=1883
-    - PREFIX=sms2mqtt
-    - CLIENTID=sms2mqttclid
-    - USER=mqtt_username
-    - PASSWORD=mqtt_password
+      - PIN=1234
+      - HOST=10.0.0.2
+      - PORT=8883
+      - PREFIX=sms2mqtt
+      - CLIENTID=sms2mqttclid
+      - USER=mqtt_username
+      - PASSWORD=mqtt_password
+      - USETLS=true
     restart: always
 ```
 
@@ -67,6 +69,8 @@ services:
 * `CLIENTID`: **Optional**, MQTT client id to use
 * `USER`: **Optional**, MQTT username
 * `PASSWORD`: **Optional**, MQTT password
+* `USETLS`: **Optional**, Enable TLS/SSL connection to MQTT broker (use 'true', '1' or 'yes' to enable)
+
 
 ## Send
 

sms2mqtt.py

@@ -6,7 +6,7 @@
 import paho.mqtt.client as mqtt
 import gammu
 import json
-
+import certifi
 
 # callback when the broker responds to our connection request.
 def on_mqtt_connect(client, userdata, flags, rc):
@@ -145,6 +145,8 @@ def get_signal_info():
 
 old_signal_info = ""
 
+
+
 # function used to obtain battery charge
 def get_battery_charge():
     global old_battery_charge
@@ -190,6 +192,16 @@ def shutdown(signum=None, frame=None):
     client.publish(f"{mqttprefix}/connected", "0", 0, True)
     client.disconnect()
 
+def setup_mqtt_ssl(client, use_tls=False):
+    try:
+        if use_tls:
+            client.tls_set(ca_certs=certifi.where())
+            logging.info("SSL/TLS configured successfully")
+        else:
+            logging.info("Connecting without SSL/TLS")
+    except Exception as e:
+        logging.error(f"Error configuring SSL/TLS: {e}")
+        exit(1)
 
 if __name__ == "__main__":
     logging.basicConfig( format="%(asctime)s: %(message)s", level=logging.INFO, datefmt="%H:%M:%S")
@@ -222,6 +234,7 @@ def shutdown(signum=None, frame=None):
     mqttclientid = os.getenv("CLIENTID","sms2mqtt")
     mqttuser = os.getenv("USER")
     mqttpassword = os.getenv("PASSWORD")
+    use_tls = str(os.getenv("USETLS", "")).lower() in ('true', '1', 'yes')
 
     signal.signal(signal.SIGINT, shutdown)
     signal.signal(signal.SIGTERM, shutdown)
@@ -256,6 +269,7 @@ def shutdown(signum=None, frame=None):
 
     client = mqtt.Client(mqttclientid)
     client.username_pw_set(mqttuser, mqttpassword)
+    setup_mqtt_ssl(client,use_tls)
     client.on_connect = on_mqtt_connect
     client.on_disconnect = on_mqtt_disconnect
     client.on_message = on_mqtt_message