Python API for talking to a MySensors gateway
Python API for talking to a MySensors gateway. Currently supports serial protocol v1.4, v1.5, v2.0 - v2.2. Not all features of v2.x are implemented yet.
- Supports smartsleep with serial API v2.x.
- Supports the MQTT client gateway with serial API v2.x.
- Supports OTA updates, for both DualOptiboot and MYSBootloader bootloaders.
- All gateway instances, serial, tcp (ethernet) or mqtt will run in separate threads.
- As an alternative to running the gateway in its own thread, there are experimental implementations of all gateways using asyncio.
pymysensors requires Python 3.5.3+.
You can easily install it from PyPI:
pip3 install pymysensors
Currently the API is best used by implementing a callback handler
import mysensors.mysensors as mysensors def event(message): """Callback for mysensors updates.""" print('sensor_update ' + str(message.node_id)) GATEWAY = mysensors.SerialGateway('/dev/ttyACM0', event) GATEWAY.start()
In the above example pymysensors will call "event" whenever a node in the Mysensors network has been updated. The message passed to the callback handler has the following data:
Message gateway - the gateway instance node_id - the sensor node identifier child_id - the child sensor id type - the message type, for example "set" or "presentation" (int) ack - True is message was an ACK, false otherwise (0 or 1) sub_type - the message sub_type (int) payload - the payload of the message (string)
Note: The content of the sub_type differs according to the context. In presentation messages, the sub_type denotes S_TYPE data (such as S_INFO). In 'set' and 'req' messages the sub_type denotes V_TYPE data (such as V_TEXT).
Symbolic names for the Message types and sub_types are defined in the protocol version-specific const_X.py files.
The data structure of a gateway and it's network is described below.
SerialGateway/TCPGateway/MQTTGateway sensors - a dict containing all nodes for the gateway; node is of type Sensor Sensor - a sensor node children - a dict containing all child sensors for the node sensor_id - node id on the MySensors network type - 17 for node or 18 for repeater sketch_name sketch_version battery_level protocol_version - the mysensors protocol version used by the node ChildSensor - a child sensor id - child id on the parent node type - data type, S_HUM, S_TEMP etc. description - the child description sent when presenting the child values - a dictionary of values (V_HUM, V_TEMP, etc.)
Getting the type and values of node 23, child sensor 4 would be performed as follows:
s_type = GATEWAY.sensors.children.type values = GATEWAY.sensors.children.values
Similarly, printing all the sketch names of the found nodes could look like this:
for node in GATEWAY.sensors.values(): print(node.sketch_name)
Getting a child object inside the event function could be:
if GATEWAY.is_sensor(message.node_id, message.child_id): child = GATEWAY.sensors[message.node_id].children[message.child_id] else: print("Child not available yet.")
To update a node child sensor value and send it to the node, use the set_child_value method in the Gateway class:
# To set sensor 1 (int), child 1 (int), sub-type V_LIGHT (= 2) (int), with value 1. GATEWAY.set_child_value(1, 1, 2, 1)
With persistence mode on, you can restart the gateway without
having to restart each individual node in your sensor network. To enable persistence mode, the keyword argument
in the constructor should be True. A path to the config file
can be specified as the keyword argument
persistence_file. The file type (.pickle or .json) will set which persistence protocol to use, pickle or json. JSON files can be read using a normal text editor. Saving to the persistence file will be done on a schedule every 10 seconds if an update has been done since the last save. Make sure you start the persistence saving before starting the gateway.
Set the keyword argument
protocol_version to set which version of the MySensors serial API to use. The default value is
'1.4'. Set the
protocol_version to the version you're using.
The serial gateway also supports setting the baudrate, read timeout and reconnect timeout.
import mysensors.mysensors as mysensors def event(message): """Callback for mysensors updates.""" print("sensor_update " + str(message.node_id)) GATEWAY = mysensors.SerialGateway( '/dev/ttyACM0', baud=115200, timeout=1.0, reconnect_timeout=10.0, event_callback=event, persistence=True, persistence_file='somefolder/mysensors.pickle', protocol_version='2.2') GATEWAY.start_persistence() # optional, remove this line if you don't need persistence. GATEWAY.start()
There are two other gateway types supported besides the serial gateway: the tcp-ethernet gateway and the MQTT gateway.
TCP ethernet gateway
The ethernet gateway is initialized similar to the serial gateway. The ethernet gateway supports setting the tcp host port, receive timeout and reconnect timeout, besides the common settings and the host ip address.
GATEWAY = mysensors.TCPGateway( '127.0.0.1', port=5003, timeout=1.0, reconnect_timeout=10.0, event_callback=event, persistence=True, persistence_file='somefolder/mysensors.pickle', protocol_version='1.4')
The MQTT gateway requires MySensors serial API v2.0 or greater and the MQTT client gateway example sketch loaded in the gateway device. The gateway also requires an MQTT broker and a python MQTT client interface to the broker. See mqtt.py for an example of how to implement this and initialize the MQTT gateway.
Over the air (OTA) firmware updates
update_fw to set one or more nodes for OTA
firmware update. The method takes three positional arguments and one
keyword arguement. The first argument should be the node id of the node to
update. This can also be a list of many node ids. The next two arguments should
be integers representing the firwmare type and version. The keyword argument is
optional and should be a path to a hex file with the new firmware.
GATEWAY.update_fw([1, 2], 1, 2, fw_path='/path/to/firmware.hex')
update_fw method has been called the node(s) will be requested
to restart when pymysensors Gateway receives the next set message. After
restart and during the MySensors
begin method, the node will send a firmware
config request. The pymysensors library will respond to the config request. If
the node receives a proper firmware config response it will send a firmware
request for a block of firmware. The pymysensors library will handle this and
send a firmware response message. The latter request-response conversation will
continue until all blocks of firmware are sent. If the CRC of the transmitted
firmware match the CRC of the firmware config response, the node will restart
and load the new firmware.
The gateway method
get_gateway_id will try to return a unique id for the
gateway. This will be the serial number of the usb device for serial gateways,
the mac address of the connected gateway for tcp gateways or the publish topic
prefix (in_prefix) for mqtt gateways.
It's possible to register two optional callbacks on the gateway that are called
when the connection is made and when the connection is lost to the gateway
device. Both callbacks should accept a gateway parameter, which is the gateway
instance. The connection lost callback should also accept a second parameter
for possible connection error exception argument. If connection was lost
without error, eg when disconnecting, the error argument will be
NOTE: The MQTT gateway doesn't support these callbacks since the connection to the MQTT broker is handled outside of pymysensors.
def conn_made(gateway): """React when the connection is made to the gateway device.""" pass GATEWAY.on_conn_made = conn_made def conn_lost(gateway, error): """React when the connection is lost to the gateway device.""" pass GATEWAY.on_conn_lost = conn_lost
The serial, TCP and MQTT gateways now also have versions that support asyncio. Use the
AsyncTCPGateway class or
AsyncMQTTGateway class to make a gateway that
uses asyncio. The following public methods are coroutines in the async gateway:
See async_main.py for an example of how to use this gateway.
Install the packages needed for development.
pip install -r requirements_dev.txt
Use the Makefile to run common development tasks.
We use black code formatter to automatically format the code. This requires Python 3.6 for development.
See the release instructions.
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