diff --git a/agent/agent.py b/agent/agent.py
new file mode 100644
index 0000000..e69de29
diff --git a/agent/config/gsm.json b/agent/config/gsm.json
index bc0f418..8590d79 100644
--- a/agent/config/gsm.json
+++ b/agent/config/gsm.json
@@ -6,7 +6,8 @@
    },
    {
       "dev":"/dev/ttyUSB1",
-      "msisdn":"+443312123452"
+      "msisdn":"+443312123452",
+      "pin": "12345"
    },
    {
       "dev":"/dev/ttyUSB2",
diff --git a/agent/gsm/__init__.py b/agent/gsm/__init__.py
new file mode 100644
index 0000000..aa49d02
--- /dev/null
+++ b/agent/gsm/__init__.py
@@ -0,0 +1,66 @@
+import logging
+import serial
+
+class Gsm:
+    def __init__(self, port, msisdn, imei=None, pin=None):
+        self.port = port
+        logging.info('Initializing G clsm cass for port ' + port)
+        try:
+            self.console = serial.Serial(self.port, 112500, timeout=3)
+        except:
+            logging.error('Error connecting to ' + self.port)
+        self.msisdn = msisdn
+        self.cmd("AT+CMGF=1")
+        self.status = self.check_status()
+        self.unlock_sim(pin)
+        loggin.info("Current status: " + self.status)
+        if imei is not None:
+            r = self.set_imei(imei)
+            if r:
+                self.imei = imei
+                loggin.info("IMEI Changed")
+
+    def cmd(self, cmd):
+        self.console.write(cmd.encode("ascii"))
+        return list(map(lambda elem: elem.decode("ascii", errors="replace"), port.readlines()))
+
+    def check_status(self):
+        r = self.cmd("ATI")
+        if "OK" in r:
+            return True
+        else
+            return False
+
+    def unlock_sim(self, pin):
+        status = self.cmd("AT+CPIN?")
+
+        if status == "+CPIN:READY":
+            return True
+        elif "+CPIN:SIM PIN" in status:
+            auth = self.cmd('AT+CPIN="' + pin + '"')
+            if "OK" in auth:
+                loggin.info("Pin correct")
+                return True
+            else:
+                logging.error("Wrong PIN")
+                return False
+        else:
+            logging.error("Unknown PIN error")
+            return False
+
+    def set_imei(self, imei):
+        r = self.cmd('AT+EMGR=1,7,"' + imei + '"')
+        if "OK" in r:
+            return True
+        else
+            return False
+
+    def check_messages(self):
+        r = self.cmd("AT+CMGL=REC UNREAD")
+        print(r)
+
+    def delete_messages(self):
+        r = self.cmd("")
+
+    def parse_message(self, message):
+        return True
\ No newline at end of file