speech_server.py

import paho.mqtt.client as mqtt
import json
import os

serverIP = os.environ['pi_server_ip']

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))

    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe("speech/talk")



# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print(msg.topic+" "+str(msg.payload))
    phrase = json.loads(msg.payload)
    speakingPhrase = phrase["say"]
    if "parms" in phrase:
        os.system("espeak " + phrase["parms"] + " \"" + speakingPhrase + "\"") 
    elif "file" in phrase:
        os.system("aplay " +  phrase["file"] )
    else:
        os.system("espeak " + "\"" + speakingPhrase + "\"")

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect(serverIP, 1883, 60)
#client.connect("192.168.1.124", 1883, 60)


# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.
client.loop_forever()