import paho.mqtt.client as mqtt

client = None
host = None

"""
Wrapper module for paho mqtt library, providing a singleton instance of the client to be used. 
"""

# Arguably not needed, just want to make the client static, but here anyway.
def connect():
    global client
    if client is None or host is None:
        print("Error: Client and/or host are not initialised.")
    else:
        client.connect(host, port=1883, keepalive=60, bind_address="")
        client.loop_start()

def disconnect():
    global client
    if client is not None:
        client.loop_stop()
        client.disconnect()
    else:
        print("Error: Client is not initialised.")

def Client():
    global client
    if client is None:
        client =  mqtt.Client()

    return client