diff --git a/esphomeyaml/__main__.py b/esphomeyaml/__main__.py
index 9a60ebe130..5d4ddaf185 100644
--- a/esphomeyaml/__main__.py
+++ b/esphomeyaml/__main__.py
@@ -16,6 +16,7 @@ from esphomeyaml.core import ESPHomeYAMLError
 from esphomeyaml.helpers import AssignmentExpression, Expression, RawStatement, \
     _EXPRESSIONS, add, \
     add_job, color, flush_tasks, indent, quote, statement, relative_path
+from esphomeyaml.util import safe_print
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -39,11 +40,11 @@ def choose_serial_port(config):
 
     if not result:
         return 'OTA'
-    print(u"Found multiple serial port options, please choose one:")
+    safe_print(u"Found multiple serial port options, please choose one:")
     for i, (res, desc) in enumerate(result):
-        print(u"  [{}] {} ({})".format(i, res, desc))
-    print(u"  [{}] Over The Air ({})".format(len(result), get_upload_host(config)))
-    print()
+        safe_print(u"  [{}] {} ({})".format(i, res, desc))
+    safe_print(u"  [{}] Over The Air ({})".format(len(result), get_upload_host(config)))
+    safe_print()
     while True:
         opt = raw_input('(number): ')
         if opt in result:
@@ -55,7 +56,7 @@ def choose_serial_port(config):
                 raise ValueError
             break
         except ValueError:
-            print(color('red', u"Invalid option: '{}'".format(opt)))
+            safe_print(color('red', u"Invalid option: '{}'".format(opt)))
     if opt == len(result):
         return 'OTA'
     return result[opt][0]
@@ -111,10 +112,7 @@ def run_miniterm(config, port, escape=False):
             message = time + line
             if escape:
                 message = message.replace('\033', '\\033')
-            try:
-                print(message)
-            except UnicodeEncodeError:
-                print(message.encode('ascii', 'backslashreplace'))
+            safe_print(message)
 
 
 def write_cpp(config):
@@ -295,7 +293,7 @@ def strip_default_ids(config):
 def command_config(args, config):
     if not args.verbose:
         config = strip_default_ids(config)
-    print(yaml_util.dump(config))
+    safe_print(yaml_util.dump(config))
     return 0
 
 
@@ -354,7 +352,7 @@ def command_mqtt_fingerprint(args, config):
 
 
 def command_version(args):
-    print(u"Version: {}".format(const.__version__))
+    safe_print(u"Version: {}".format(const.__version__))
     return 0
 
 
@@ -496,7 +494,7 @@ def run_esphomeyaml(argv):
         except ESPHomeYAMLError as e:
             _LOGGER.error(e)
             return 1
-    print(u"Unknown command {}".format(args.command))
+    safe_print(u"Unknown command {}".format(args.command))
     return 1
 
 
diff --git a/esphomeyaml/components/mqtt.py b/esphomeyaml/components/mqtt.py
index 0aa24d84c0..98d43f6137 100644
--- a/esphomeyaml/components/mqtt.py
+++ b/esphomeyaml/components/mqtt.py
@@ -10,10 +10,10 @@ from esphomeyaml.const import CONF_BIRTH_MESSAGE, CONF_BROKER, CONF_CLIENT_ID, C
     CONF_DISCOVERY_PREFIX, CONF_DISCOVERY_RETAIN, CONF_ID, CONF_KEEPALIVE, CONF_LEVEL, \
     CONF_LOG_TOPIC, CONF_ON_MESSAGE, CONF_PASSWORD, CONF_PAYLOAD, CONF_PORT, CONF_QOS, \
     CONF_REBOOT_TIMEOUT, CONF_RETAIN, CONF_SHUTDOWN_MESSAGE, CONF_SSL_FINGERPRINTS, CONF_TOPIC, \
-    CONF_TOPIC_PREFIX, CONF_TRIGGER_ID, CONF_USERNAME, CONF_WILL_MESSAGE
+    CONF_TOPIC_PREFIX, CONF_TRIGGER_ID, CONF_USERNAME, CONF_WILL_MESSAGE, CONF_ON_JSON_MESSAGE
 from esphomeyaml.helpers import App, ArrayInitializer, Pvariable, RawExpression, \
     StructInitializer, TemplateArguments, add, esphomelib_ns, optional, std_string, templatable, \
-    uint8, bool_
+    uint8, bool_, JsonObjectRef, process_lambda, JsonObjectConstRef
 
 
 def validate_message_just_topic(value):
@@ -37,7 +37,9 @@ mqtt_ns = esphomelib_ns.namespace('mqtt')
 MQTTMessage = mqtt_ns.MQTTMessage
 MQTTClientComponent = mqtt_ns.MQTTClientComponent
 MQTTPublishAction = mqtt_ns.MQTTPublishAction
+MQTTPublishJsonAction = mqtt_ns.MQTTPublishJsonAction
 MQTTMessageTrigger = mqtt_ns.MQTTMessageTrigger
+MQTTJsonMessageTrigger = mqtt_ns.MQTTJsonMessageTrigger
 
 
 def validate_broker(value):
@@ -79,9 +81,14 @@ CONFIG_SCHEMA = vol.Schema({
     vol.Optional(CONF_REBOOT_TIMEOUT): cv.positive_time_period_milliseconds,
     vol.Optional(CONF_ON_MESSAGE): vol.All(cv.ensure_list, [automation.validate_automation({
         cv.GenerateID(CONF_TRIGGER_ID): cv.declare_variable_id(MQTTMessageTrigger),
-        vol.Required(CONF_TOPIC): cv.publish_topic,
+        vol.Required(CONF_TOPIC): cv.subscribe_topic,
         vol.Optional(CONF_QOS, default=0): cv.mqtt_qos,
-    })])
+    })]),
+    vol.Optional(CONF_ON_JSON_MESSAGE): vol.All(cv.ensure_list, [automation.validate_automation({
+        cv.GenerateID(CONF_TRIGGER_ID): cv.declare_variable_id(MQTTJsonMessageTrigger),
+        vol.Required(CONF_TOPIC): cv.subscribe_topic,
+        vol.Optional(CONF_QOS, default=0): cv.mqtt_qos,
+    })]),
 })
 
 
@@ -160,6 +167,11 @@ def to_code(config):
         trigger = Pvariable(conf[CONF_TRIGGER_ID], rhs)
         automation.build_automation(trigger, std_string, conf)
 
+    for conf in config.get(CONF_ON_JSON_MESSAGE, []):
+        rhs = mqtt.make_json_message_trigger(conf[CONF_TOPIC], conf[CONF_QOS])
+        trigger = Pvariable(conf[CONF_TRIGGER_ID], rhs)
+        automation.build_automation(trigger, JsonObjectConstRef, conf)
+
 
 CONF_MQTT_PUBLISH = 'mqtt.publish'
 MQTT_PUBLISH_ACTION_SCHEMA = vol.Schema({
@@ -194,6 +206,35 @@ def mqtt_publish_action_to_code(config, action_id, arg_type):
     yield action
 
 
+CONF_MQTT_PUBLISH_JSON = 'mqtt.publish_json'
+MQTT_PUBLISH_JSON_ACTION_SCHEMA = vol.Schema({
+    vol.Required(CONF_TOPIC): cv.templatable(cv.publish_topic),
+    vol.Required(CONF_PAYLOAD): cv.lambda_,
+    vol.Optional(CONF_QOS): cv.mqtt_qos,
+    vol.Optional(CONF_RETAIN): cv.boolean,
+})
+
+
+@ACTION_REGISTRY.register(CONF_MQTT_PUBLISH_JSON, MQTT_PUBLISH_JSON_ACTION_SCHEMA)
+def mqtt_publish_json_action_to_code(config, action_id, arg_type):
+    template_arg = TemplateArguments(arg_type)
+    rhs = App.Pget_mqtt_client().Pmake_publish_json_action(template_arg)
+    type = MQTTPublishJsonAction.template(template_arg)
+    action = Pvariable(action_id, rhs, type=type)
+    for template_ in templatable(config[CONF_TOPIC], arg_type, std_string):
+        yield None
+    add(action.set_topic(template_))
+
+    for lambda_ in process_lambda(config[CONF_PAYLOAD], [(arg_type, 'x'), (JsonObjectRef, 'root')]):
+        yield None
+    add(action.set_payload(lambda_))
+    if CONF_QOS in config:
+        add(action.set_qos(config[CONF_QOS]))
+    if CONF_RETAIN in config:
+        add(action.set_retain(config[CONF_RETAIN]))
+    yield action
+
+
 def required_build_flags(config):
     if CONF_SSL_FINGERPRINTS in config:
         return '-DASYNC_TCP_SSL_ENABLED=1'
diff --git a/esphomeyaml/config.py b/esphomeyaml/config.py
index 2771fc42a6..814df4905b 100644
--- a/esphomeyaml/config.py
+++ b/esphomeyaml/config.py
@@ -11,6 +11,7 @@ from esphomeyaml import core, yaml_util, core_config
 from esphomeyaml.const import CONF_ESPHOMEYAML, CONF_PLATFORM, CONF_WIFI, ESP_PLATFORMS
 from esphomeyaml.core import ESPHomeYAMLError
 from esphomeyaml.helpers import color
+from esphomeyaml.util import safe_print
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -306,17 +307,17 @@ def dump_dict(layer, indent_count=3, listi=False, **kwargs):
     if isinstance(layer, dict):
         for key, value in sorted(layer.items(), key=sort_dict_key):
             if isinstance(value, (dict, list)):
-                print(indent_str, key + ':', line_info(value, **kwargs))
+                safe_print(u"{} {}: {}".format(indent_str, key, line_info(value, **kwargs)))
                 dump_dict(value, indent_count + 2)
             else:
-                print(indent_str, key + ':', value)
+                safe_print(u"{} {}: {}".format(indent_str, key, value))
             indent_str = indent_count * ' '
     if isinstance(layer, (list, tuple)):
         for i in layer:
             if isinstance(i, dict):
                 dump_dict(i, indent_count + 2, True)
             else:
-                print(' ', indent_str, i)
+                safe_print(u" {} {}".format(indent_str, i))
 
 
 def read_config(path):
@@ -334,10 +335,11 @@ def read_config(path):
             excepts[domain].append(config)
 
     if excepts:
-        print(color('bold_white', u"Failed config"))
+        safe_print(color('bold_white', u"Failed config"))
         for domain, config in excepts.iteritems():
-            print(' ', color('bold_red', domain + ':'), color('red', '', reset='red'))
+            safe_print(u' {} {}'.format(color('bold_red', domain + u':'),
+                                        color('red', '', reset='red')))
             dump_dict(config, reset='red')
-            print(color('reset'))
+            safe_print(color('reset'))
         return None
     return OrderedDict(res)
diff --git a/esphomeyaml/const.py b/esphomeyaml/const.py
index 7ae8ffe243..bad9a04c65 100644
--- a/esphomeyaml/const.py
+++ b/esphomeyaml/const.py
@@ -342,6 +342,7 @@ CONF_CRON = 'cron'
 CONF_POWER_SAVE_MODE = 'power_save_mode'
 CONF_POWER_ON_VALUE = 'power_on_value'
 CONF_ON_TAG = 'on_tag'
+CONF_ON_JSON_MESSAGE = 'on_json_message'
 
 ALLOWED_NAME_CHARS = u'abcdefghijklmnopqrstuvwxyz0123456789_'
 ARDUINO_VERSION_ESP32_DEV = 'https://github.com/platformio/platform-espressif32.git#feature/stage'
diff --git a/esphomeyaml/helpers.py b/esphomeyaml/helpers.py
index 601205aa87..b28eca3115 100644
--- a/esphomeyaml/helpers.py
+++ b/esphomeyaml/helpers.py
@@ -536,6 +536,10 @@ class MockObj(Expression):
             obj = MockObj(u'{} &'.format(self.base), u'')
             obj.requires.append(self)
             return obj
+        if name == "const":
+            obj = MockObj(u'const {}'.format(self.base), u'')
+            obj.requires.append(self)
+            return obj
         raise NotImplementedError()
 
     def has_side_effects(self):
@@ -568,6 +572,10 @@ NoArg = esphomelib_ns.NoArg
 App = esphomelib_ns.App
 Application = esphomelib_ns.namespace('Application')
 optional = esphomelib_ns.optional
+arduino_json_ns = global_ns.namespace('ArduinoJson')
+JsonObject = arduino_json_ns.JsonObject
+JsonObjectRef = JsonObject.operator('ref')
+JsonObjectConstRef = JsonObjectRef.operator('const')
 
 GPIOPin = esphomelib_ns.GPIOPin
 GPIOOutputPin = esphomelib_ns.GPIOOutputPin
diff --git a/esphomeyaml/mqtt.py b/esphomeyaml/mqtt.py
index 0160d51197..9ed0e1d7d5 100644
--- a/esphomeyaml/mqtt.py
+++ b/esphomeyaml/mqtt.py
@@ -14,6 +14,7 @@ from esphomeyaml.const import CONF_BROKER, CONF_DISCOVERY_PREFIX, CONF_ESPHOMEYA
     CONF_MQTT, CONF_NAME, CONF_PASSWORD, CONF_PORT, CONF_TOPIC_PREFIX, \
     CONF_USERNAME, CONF_TOPIC, CONF_SSL_FINGERPRINTS
 from esphomeyaml.helpers import color
+from esphomeyaml.util import safe_print
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -70,10 +71,7 @@ def show_logs(config, topic=None, username=None, password=None, client_id=None,
         message = time + msg.payload
         if escape:
             message = message.replace('\033', '\\033')
-        try:
-            print(message)
-        except UnicodeEncodeError:
-            print(message.encode('ascii', 'backslashreplace'))
+        safe_print(message)
 
     return initialize(config, [topic], on_message, username, password, client_id)
 
@@ -113,6 +111,7 @@ def get_fingerprint(config):
 
     sha1 = hashlib.sha1(cert_der).hexdigest()
 
-    print(u"SHA1 Fingerprint: " + color('cyan', sha1))
-    print(u"Copy above string into mqtt.ssl_fingerprints section of {}".format(core.CONFIG_PATH))
+    safe_print(u"SHA1 Fingerprint: " + color('cyan', sha1))
+    safe_print(u"Copy the string above into mqtt.ssl_fingerprints section of {}"
+               u"".format(core.CONFIG_PATH))
     return 0
diff --git a/esphomeyaml/util.py b/esphomeyaml/util.py
index e54e3758c1..c52b54284f 100644
--- a/esphomeyaml/util.py
+++ b/esphomeyaml/util.py
@@ -1,3 +1,6 @@
+from __future__ import print_function
+
+
 class Registry(dict):
     def register(self, name):
         def decorator(fun):
@@ -14,3 +17,16 @@ class ServiceRegistry(dict):
             return fun
 
         return decorator
+
+
+def safe_print(message=""):
+    try:
+        print(message)
+        return
+    except UnicodeEncodeError:
+        pass
+
+    try:
+        print(message.encode('ascii', 'backslashreplace'))
+    except UnicodeEncodeError:
+        print("Cannot print line because of invalid locale!")
diff --git a/esphomeyaml/wizard.py b/esphomeyaml/wizard.py
index 6b5c43471c..b250bc151c 100644
--- a/esphomeyaml/wizard.py
+++ b/esphomeyaml/wizard.py
@@ -6,14 +6,13 @@ import unicodedata
 
 import voluptuous as vol
 
-import esphomeyaml.config_validation as cv
 from esphomeyaml.components import mqtt
+import esphomeyaml.config_validation as cv
 from esphomeyaml.const import ESP_PLATFORMS, ESP_PLATFORM_ESP32, ESP_PLATFORM_ESP8266
 from esphomeyaml.helpers import color
-
-
 # pylint: disable=anomalous-backslash-in-string
 from esphomeyaml.pins import ESP32_BOARD_PINS, ESP8266_BOARD_PINS
+from esphomeyaml.util import safe_print
 
 CORE_BIG = """    _____ ____  _____  ______
    / ____/ __ \|  __ \|  ____|
@@ -52,7 +51,7 @@ OTA_BIG = """       ____ _______
 """
 
 # TODO handle escaping
-BASE_CONFIG = """esphomeyaml:
+BASE_CONFIG = u"""esphomeyaml:
   name: {name}
   platform: {platform}
   board: {board}
@@ -76,9 +75,9 @@ def wizard_file(**kwargs):
     config = BASE_CONFIG.format(**kwargs)
 
     if kwargs['ota_password']:
-        config += "ota:\n  password: '{}'\n".format(kwargs['ota_password'])
+        config += u"ota:\n  password: '{}'\n".format(kwargs['ota_password'])
     else:
-        config += "ota:\n"
+        config += u"ota:\n"
 
     return config
 
@@ -90,18 +89,18 @@ else:
     from time import sleep
 
 
-def print_step(step, big):
-    print()
-    print()
-    print("============= STEP {} =============".format(step))
-    print(big)
-    print("===================================")
+def safe_print_step(step, big):
+    safe_print()
+    safe_print()
+    safe_print("============= STEP {} =============".format(step))
+    safe_print(big)
+    safe_print("===================================")
     sleep(0.25)
 
 
 def default_input(text, default):
-    print()
-    print("Press ENTER for default ({})".format(default))
+    safe_print()
+    safe_print(u"Press ENTER for default ({})".format(default))
     return raw_input(text.format(default)) or default
 
 
@@ -113,30 +112,30 @@ def strip_accents(string):
 
 def wizard(path):
     if not path.endswith('.yaml') and not path.endswith('.yml'):
-        print("Please make your configuration file {} have the extension .yaml or .yml".format(
-            color('cyan', path)))
+        safe_print(u"Please make your configuration file {} have the extension .yaml or .yml"
+                   u"".format(color('cyan', path)))
         return 1
     if os.path.exists(path):
-        print("Uh oh, it seems like {} already exists, please delete that file first "
-              "or chose another configuration file.".format(color('cyan', path)))
+        safe_print(u"Uh oh, it seems like {} already exists, please delete that file first "
+                   u"or chose another configuration file.".format(color('cyan', path)))
         return 1
-    print("Hi there!")
+    safe_print("Hi there!")
     sleep(1.5)
-    print("I'm the wizard of esphomeyaml :)")
+    safe_print("I'm the wizard of esphomeyaml :)")
     sleep(1.25)
-    print("And I'm here to help you get started with esphomeyaml.")
+    safe_print("And I'm here to help you get started with esphomeyaml.")
     sleep(2.0)
-    print("In 5 steps I'm going to guide you through creating a basic "
-          "configuration file for your custom ESP8266/ESP32 firmware. Yay!")
+    safe_print("In 5 steps I'm going to guide you through creating a basic "
+               "configuration file for your custom ESP8266/ESP32 firmware. Yay!")
     sleep(3.0)
-    print()
-    print_step(1, CORE_BIG)
-    print("First up, please choose a " + color('green', 'name') + " for your node.")
-    print("It should be a unique name that can be used to identify the device later.")
+    safe_print()
+    safe_print_step(1, CORE_BIG)
+    safe_print("First up, please choose a " + color('green', 'name') + " for your node.")
+    safe_print("It should be a unique name that can be used to identify the device later.")
     sleep(1)
-    print("For example, I like calling the node in my living room {}.".format(
+    safe_print("For example, I like calling the node in my living room {}.".format(
         color('bold_white', "livingroom")))
-    print()
+    safe_print()
     sleep(1)
     name = raw_input(color("bold_white", "(name): "))
     while True:
@@ -144,34 +143,34 @@ def wizard(path):
             name = cv.valid_name(name)
             break
         except vol.Invalid:
-            print(color("red", "Oh noes, \"{}\" isn't a valid name. Names can only include "
-                               "numbers, letters and underscores.".format(name)))
+            safe_print(color("red", u"Oh noes, \"{}\" isn't a valid name. Names can only include "
+                                    u"numbers, letters and underscores.".format(name)))
             name = strip_accents(name).replace(' ', '_')
             name = u''.join(c for c in name if c in cv.ALLOWED_NAME_CHARS)
-            print("Shall I use \"{}\" as the name instead?".format(color('cyan', name)))
+            safe_print(u"Shall I use \"{}\" as the name instead?".format(color('cyan', name)))
             sleep(0.5)
-            name = default_input("(name [{}]): ", name)
+            name = default_input(u"(name [{}]): ", name)
 
-    print("Great! Your node is now called \"{}\".".format(color('cyan', name)))
+    safe_print(u"Great! Your node is now called \"{}\".".format(color('cyan', name)))
     sleep(1)
-    print_step(2, ESP_BIG)
-    print("Now I'd like to know what microcontroller you're using so that I can compile "
-          "firmwares for it.")
-    print("Are you using an " + color('green', 'ESP32') + " or " +
-          color('green', 'ESP8266') + " platform? (Choose ESP8266 for Sonoff devices)")
+    safe_print_step(2, ESP_BIG)
+    safe_print("Now I'd like to know what microcontroller you're using so that I can compile "
+               "firmwares for it.")
+    safe_print("Are you using an " + color('green', 'ESP32') + " or " +
+               color('green', 'ESP8266') + " platform? (Choose ESP8266 for Sonoff devices)")
     while True:
         sleep(0.5)
-        print()
-        print("Please enter either ESP32 or ESP8266.")
+        safe_print()
+        safe_print("Please enter either ESP32 or ESP8266.")
         platform = raw_input(color("bold_white", "(ESP32/ESP8266): "))
         try:
             platform = vol.All(vol.Upper, vol.Any(*ESP_PLATFORMS))(platform)
             break
         except vol.Invalid:
-            print("Unfortunately, I can't find an espressif microcontroller called "
-                  "\"{}\". Please try again.".format(platform))
-    print("Thanks! You've chosen {} as your platform.".format(color('cyan', platform)))
-    print()
+            safe_print(u"Unfortunately, I can't find an espressif microcontroller called "
+                       u"\"{}\". Please try again.".format(platform))
+    safe_print(u"Thanks! You've chosen {} as your platform.".format(color('cyan', platform)))
+    safe_print()
     sleep(1)
 
     if platform == ESP_PLATFORM_ESP32:
@@ -179,18 +178,18 @@ def wizard(path):
     else:
         board_link = 'http://docs.platformio.org/en/latest/platforms/espressif8266.html#boards'
 
-    print("Next, I need to know what " + color('green', 'board') + " you're using.")
+    safe_print("Next, I need to know what " + color('green', 'board') + " you're using.")
     sleep(0.5)
-    print("Please go to {} and choose a board.".format(color('green', board_link)))
+    safe_print("Please go to {} and choose a board.".format(color('green', board_link)))
     if platform == ESP_PLATFORM_ESP8266:
-        print("(Type " + color('green', 'esp01_1m') + " for Sonoff devices)")
-    print()
+        safe_print("(Type " + color('green', 'esp01_1m') + " for Sonoff devices)")
+    safe_print()
     # Don't sleep because user needs to copy link
     if platform == ESP_PLATFORM_ESP32:
-        print("For example \"{}\".".format(color("bold_white", 'nodemcu-32s')))
+        safe_print("For example \"{}\".".format(color("bold_white", 'nodemcu-32s')))
         boards = list(ESP32_BOARD_PINS.keys())
     else:
-        print("For example \"{}\".".format(color("bold_white", 'nodemcuv2')))
+        safe_print("For example \"{}\".".format(color("bold_white", 'nodemcuv2')))
         boards = list(ESP8266_BOARD_PINS.keys())
     while True:
         board = raw_input(color("bold_white", "(board): "))
@@ -198,71 +197,73 @@ def wizard(path):
             board = vol.All(vol.Lower, vol.Any(*boards))(board)
             break
         except vol.Invalid:
-            print(color('red', "Sorry, I don't think the board \"{}\" exists."))
-            print()
+            safe_print(color('red', "Sorry, I don't think the board \"{}\" exists."))
+            safe_print()
             sleep(0.25)
-            print("Possible options are {}".format(', '.join(boards)))
-            print()
+            safe_print("Possible options are {}".format(', '.join(boards)))
+            safe_print()
 
-    print("Way to go! You've chosen {} as your board.".format(color('cyan', board)))
-    print()
+    safe_print(u"Way to go! You've chosen {} as your board.".format(color('cyan', board)))
+    safe_print()
     sleep(1)
 
-    print_step(3, WIFI_BIG)
-    print("In this step, I'm going to create the configuration for "
-          "WiFi.")
-    print()
+    safe_print_step(3, WIFI_BIG)
+    safe_print("In this step, I'm going to create the configuration for "
+               "WiFi.")
+    safe_print()
     sleep(1)
-    print("First, what's the " + color('green', 'SSID') + " (the name) of the WiFi network {} "
-                                                          "I should connect to?".format(name))
+    safe_print("First, what's the " + color('green', 'SSID') +
+               u" (the name) of the WiFi network {} I should connect to?".format(name))
     sleep(1.5)
-    print("For example \"{}\".".format(color('bold_white', "Abraham Linksys")))
+    safe_print("For example \"{}\".".format(color('bold_white', "Abraham Linksys")))
     while True:
         ssid = raw_input(color('bold_white', "(ssid): "))
         try:
             ssid = cv.ssid(ssid)
             break
         except vol.Invalid:
-            print(color('red', "Unfortunately, \"{}\" doesn't seem to be a valid SSID. "
-                               "Please try again.".format(ssid)))
-            print()
+            safe_print(color('red', u"Unfortunately, \"{}\" doesn't seem to be a valid SSID. "
+                                    u"Please try again.".format(ssid)))
+            safe_print()
             sleep(1)
 
-    print("Thank you very much! You've just chosen \"{}\" as your SSID.".format(
-        color('cyan', ssid)))
-    print()
+    safe_print(u"Thank you very much! You've just chosen \"{}\" as your SSID."
+               u"".format(color('cyan', ssid)))
+    safe_print()
     sleep(0.75)
 
-    print("Now please state the " + color('green', 'password') +
-          " of the WiFi network so that I can connect to it (Leave empty for no password)")
-    print()
-    print("For example \"{}\"".format(color('bold_white', 'PASSWORD42')))
+    safe_print("Now please state the " + color('green', 'password') +
+               " of the WiFi network so that I can connect to it (Leave empty for no password)")
+    safe_print()
+    safe_print("For example \"{}\"".format(color('bold_white', 'PASSWORD42')))
     sleep(0.5)
     psk = raw_input(color('bold_white', '(PSK): '))
-    print("Perfect! WiFi is now set up (you can create static IPs and so on later).")
+    safe_print("Perfect! WiFi is now set up (you can create static IPs and so on later).")
     sleep(1.5)
 
-    print_step(4, MQTT_BIG)
-    print("Almost there! Now let's setup MQTT so that your node can connect to the outside world.")
-    print()
+    safe_print_step(4, MQTT_BIG)
+    safe_print("Almost there! Now let's setup MQTT so that your node can connect to the "
+               "outside world.")
+    safe_print()
     sleep(1)
-    print("Please enter the " + color('green', 'address') + " of your MQTT broker.")
-    print()
-    print("For example \"{}\".".format(color('bold_white', '192.168.178.84')))
+    safe_print("Please enter the " + color('green', 'address') + " of your MQTT broker.")
+    safe_print()
+    safe_print("For example \"{}\".".format(color('bold_white', '192.168.178.84')))
     while True:
         broker = raw_input(color('bold_white', "(broker): "))
         try:
             broker = mqtt.validate_broker(broker)
             break
         except vol.Invalid as err:
-            print(color('red', "The broker address \"{}\" seems to be invalid: {} :(".format(
-                broker, err)))
-            print("Please try again.")
-            print()
+            safe_print(color('red', u"The broker address \"{}\" seems to be invalid: {} :("
+                                    u"".format(broker, err)))
+            safe_print("Please try again.")
+            safe_print()
             sleep(1)
 
-    print("Thanks! Now enter the " + color('green', 'username') + " and " +
-          color('green', 'password') + " for the MQTT broker. Leave empty for no authentication.")
+    safe_print("Thanks! Now enter the " + color('green', 'username') + " and " +
+               color('green', 'password') +
+               " for the MQTT broker. Leave empty for no authentication.")
     mqtt_username = raw_input(color('bold_white', '(username): '))
     mqtt_password = ''
     if mqtt_username:
@@ -271,19 +272,19 @@ def wizard(path):
         show = '*' * len(mqtt_password)
         if len(mqtt_password) >= 2:
             show = mqtt_password[:2] + '*' * len(mqtt_password)
-        print("MQTT Username: \"{}\"; Password: \"{}\"".format(
-            color('cyan', mqtt_username), color('cyan', show)))
+        safe_print(u"MQTT Username: \"{}\"; Password: \"{}\""
+                   u"".format(color('cyan', mqtt_username), color('cyan', show)))
     else:
-        print("No authentication for MQTT")
+        safe_print("No authentication for MQTT")
 
-    print_step(5, OTA_BIG)
-    print("Last step! esphomeyaml can automatically upload custom firmwares over WiFi "
-          "(over the air).")
-    print("This can be insecure if you do not trust the WiFi network. Do you want to set "
-          "an " + color('green', 'OTA password') + " for remote updates?")
-    print()
+    safe_print_step(5, OTA_BIG)
+    safe_print("Last step! esphomeyaml can automatically upload custom firmwares over WiFi "
+               "(over the air).")
+    safe_print("This can be insecure if you do not trust the WiFi network. Do you want to set "
+               "an " + color('green', 'OTA password') + " for remote updates?")
+    safe_print()
     sleep(0.25)
-    print("Press ENTER for no password")
+    safe_print("Press ENTER for no password")
     ota_password = raw_input(color('bold_white', '(password): '))
 
     config = wizard_file(name=name, platform=platform, board=board,
@@ -294,19 +295,19 @@ def wizard(path):
     with codecs.open(path, 'w') as f_handle:
         f_handle.write(config)
 
-    print()
-    print(color('cyan', "DONE! I've now written a new configuration file to ") +
-          color('bold_cyan', path))
-    print()
-    print("Next steps:")
-    print("  > If you haven't already, enable MQTT discovery in Home Assistant:")
-    print()
-    print(color('bold_white', "# In your configuration.yaml"))
-    print(color('bold_white', "mqtt:"))
-    print(color('bold_white', "  broker: {}".format(broker)))
-    print(color('bold_white', "  # ..."))
-    print(color('bold_white', "  discovery: True"))
-    print()
-    print("  > Then follow the rest of the getting started guide:")
-    print("  > https://esphomelib.com/esphomeyaml/guides/getting_started_command_line.html")
+    safe_print()
+    safe_print(color('cyan', "DONE! I've now written a new configuration file to ") +
+               color('bold_cyan', path))
+    safe_print()
+    safe_print("Next steps:")
+    safe_print("  > If you haven't already, enable MQTT discovery in Home Assistant:")
+    safe_print()
+    safe_print(color('bold_white', "# In your configuration.yaml"))
+    safe_print(color('bold_white', "mqtt:"))
+    safe_print(color('bold_white', u"  broker: {}".format(broker)))
+    safe_print(color('bold_white', "  # ..."))
+    safe_print(color('bold_white', "  discovery: True"))
+    safe_print()
+    safe_print("  > Then follow the rest of the getting started guide:")
+    safe_print("  > https://esphomelib.com/esphomeyaml/guides/getting_started_command_line.html")
     return 0
diff --git a/esphomeyaml/writer.py b/esphomeyaml/writer.py
index c83078cbaf..c045fade11 100644
--- a/esphomeyaml/writer.py
+++ b/esphomeyaml/writer.py
@@ -102,6 +102,7 @@ def get_ini_content(config, path):
         build_flags |= get_build_flags(config, 'build_flags')
         build_flags |= get_build_flags(config, 'BUILD_FLAGS')
         build_flags.add(u"-DESPHOMEYAML_USE")
+        build_flags.add("-Wno-unused-variable")
     build_flags |= get_build_flags(config, 'required_build_flags')
     build_flags |= get_build_flags(config, 'REQUIRED_BUILD_FLAGS')
 
diff --git a/tests/test1.yaml b/tests/test1.yaml
index 6bf1a6cdfa..fc44caa29b 100644
--- a/tests/test1.yaml
+++ b/tests/test1.yaml
@@ -73,6 +73,24 @@ mqtt:
       then:
       - deep_sleep.enter:
           id: deep_sleep_1
+  on_json_message:
+    topic: the/topic
+    then:
+      - lambda: |-
+          int data = x["my_data"];
+          ESP_LOGD("main", "The data is: %d", data);
+      - light.turn_on:
+          id: living_room_lights
+          transition_length: !lambda |-
+            int length = 1000;
+            if (x.containsKey("length"))
+              length = x["length"];
+            return length;
+          effect: !lambda |-
+            const char *effect = "None";
+            if (x.containsKey("effect"))
+              effect = x["effect"];
+            return effect;
 
 i2c:
   sda: 21
@@ -599,6 +617,7 @@ light:
               state = 0;
   - platform: rgb
     name: "Living Room Lights"
+    id: living_room_lights
     red: pca_0
     green: pca_1
     blue: pca_2
diff --git a/tests/test2.yaml b/tests/test2.yaml
index 4bfeb73c9f..3e091f9b3e 100644
--- a/tests/test2.yaml
+++ b/tests/test2.yaml
@@ -76,7 +76,14 @@ sensor:
   - platform: mqtt_subscribe
     name: "MQTT Subscribe Sensor 1"
     topic: "mqtt/topic"
+    id: the_sensor
     qos: 2
+    on_value:
+    - mqtt.publish_json:
+        topic: the/topic
+        payload: |-
+          root["key"] = id(the_sensor).value;
+          root["greeting"] = "Hello World";
   - platform: cse7766
     voltage:
       name: "CSE7766 Voltage"