# Programming with MicroPython: Wireless Radio

### Import FutureBoard Library

Import the Library to make use of its functions.

```
from future import *
```

### 10: Wireless Radio

### Import Radio Library

```
from radio import *
```

#### 1. Initiate a Radio

```
r=Radio(trigger)
```

Define an event trigger function and call it in the trigger parameter to automatically call the function on receiving message.

#### 2. Set the radio channel

```
r.channel=1
```

#### 3. Read the channel feed

```
r.read()
```

Returns the message.

#### 4. Publish a message to channel

```
r.send(msg)
```

#### Sample Program 1

```
import time
from radio import *

r = Radio()
print('channel', r.channel)
r.channel = 12 

while True:
    time.sleep(1)
    a = r.read()
    if a:
        print('get', a)
```

#### Sample Program 2: Event Triggers

```
from radio import *

def onmsg(msg, mac):
    print('get', msg, 'from', mac)

r = Radio(onmsg)
print('channel', r.channel)
r.channel = 12
r.send("hello world")
```

#### Advanced Program: MESH with ESPNOW

```
# 1. WiFi
import network
w0 = network.WLAN(network.STA_IF)
w0.active(True)

# 2. MAC Address
mac = w0.config('mac')
>>> mac
b'\xc4O3"\xdb\x89'

# 3. import espnow
from esp import espnow
e = espnow.ESPNow()
e.init()

# 4. Add peer MAC Address
# Note: Add the addess of the peer device
e.add_peer(b'\x8c\xaa\xb5\xb9\xf8\xf0')

# 5. Event Trigger
def rxcb(mac, msg):
    print("Recv:", mac, msg)
e.on_recv(rxcb)

# 6. Publish
e.send(b'\x8c\xaa\xb5\xb9\xf8\xf0', 'hello world')

# Seeable on receving end
# Recv: b'\xc4O3"\xdb\x89' b'hello world
```


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