# Development

## Development Setup

Custom Plugins are shipped as standard Python packages. Just create a python virtual env and add `cbpi`as dependency

{% hint style="info" %}
How to create virtual env in Python  
[https://docs.python.org/3/tutorial/venv.html](https://docs.python.org/3/tutorial/venv.html)
{% endhint %}

### 1. Create a virtual env with CBPi

```bash
python3 -m venv venv
source venv/bin/activate
python3 -m pip insatll cbpi
```

### 2. Create Folder structure



### 3. Add Custom Code



### 4. Test the Code



### 3. Build plugin



### 4. Upload the plugin

### Full Example

[https://github.com/Manuel83/cbpi4-ui-plugin](https://github.com/Manuel83/cbpi4-ui-plugin)

##   Sensor

```python
# -*- coding: utf-8 -*-
import asyncio
import random
import re
import random
from aiohttp import web
from cbpi.api import *

'''
Make sure to extend CBPiSensor
'''

@parameters([Property.Number(label="Param1", configurable=True), 
             Property.Text(label="Param2", configurable=True, default_value="HALLO"), 
             Property.Select(label="Param3", options=[1,2,4]), 
             Property.Sensor(label="Param4"), 
             Property.Actor(label="Param5")])
class CustomSensor(CBPiSensor):
    
    def __init__(self, cbpi, id, props):
    
        super(CustomSensor, self).__init__(cbpi, id, props)
        self.value = 0

    
    @action(key="Test", parameters=[])
    async def action1(self, **kwargs):
        '''
        A custom action. Which can be called from the user interface
        '''
        print("ACTION!", kwargs)

    async def run(self):
        '''
        This method is executed asynchronousely 
        In this example the code is executed every second
        '''
        while self.running is True:
            self.value = random.randint(0,50)
            self.push_update(self.value)
            await asyncio.sleep(1)
    
    def get_state(self):
        # return the current state of the sensor
        return dict(value=self.value)


def setup(cbpi):

    '''
    This method is called by the server during startup 
    Here you need to register your plugins at the server
    
    :param cbpi: the cbpi core 
    :return: 
    '''
    cbpi.plugin.register("CustomSensor", CustomSensor)
```

## Actor

```python

import logging
from unittest.mock import MagicMock, patch

from cbpi.api import *


logger = logging.getLogger(__name__)

try:
    import RPi.GPIO as GPIO
except Exception:
    logger.error("Failed to load RPi.GPIO. Using Mock")
    MockRPi = MagicMock()
    modules = {
        "RPi": MockRPi,
        "RPi.GPIO": MockRPi.GPIO
    }
    patcher = patch.dict("sys.modules", modules)
    patcher.start()
    import RPi.GPIO as GPIO


@parameters([Property.Number(label="Param1", configurable=True), 
             Property.Text(label="Param2", configurable=True, default_value="HALLO"), 
             Property.Select(label="Param3", options=[1,2,4]), 
             Property.Sensor(label="Param4"), 
             Property.Actor(label="Param5")])
class CustomActor(CBPiActor):
    my_name = ""

    # Custom property which can be configured by the user
    @action("test", parameters={})
    async def action1(self, **kwargs):
        print("ACTION !", kwargs)
        self.my_name = kwargs.get("name")
        pass
    
    def init(self):
        print("INIT")
        
        self.state = False
        pass

    async def on(self, power=0):
        logger.info("ACTOR 1111 %s ON" % self.id)
        self.state = True

    async def off(self):
        logger.info("ACTOR %s OFF " % self.id)
        self.state = False

    def get_state(self):
        
        return self.state
    
    async def run(self):
        pass

def setup(cbpi):

    '''
    This method is called by the server during startup 
    Here you need to register your plugins at the server
    
    :param cbpi: the cbpi core 
    :return: 
    '''

    cbpi.plugin.register("CustomActor", CustomActor)
```