LoPy as a lightorgan via OSC

[zappfinger]

I could not find an OSC library for LoPy's version of microPython, so I created a quick and dirty OSC UDP server for my needs. The linked video shows a song of me being filtered by Csound into low. mid and high bands. Then via OSC to the LoPy where the 3 signals are converted to R,G and B colors for the LED... video

[seb]

Very nice, have you shared your code anywhere so others who might need this could get a head start?

[zappfinger]

@seb Sure. I'll share it here. Like I said it is very quick and dirty. It accepts an OSC message with only one variable (integer or float) of the form:
'/adress1, if, value'
integer (i) should also work.
I do not parse the address tag(s). Also, in a normal OSC message multiple type tags can be used in one message, like: '/adress1, if, intval, floatval'
That is not implemented.

import socket
import time
import struct
import pycom

pycom.heartbeat(False)

def readFloat(data):
	if(len(data)<4):
		print("Error: too few bytes for float", data, len(data))
		rest = data
		float = 0
	else:
		float = struct.unpack(">f", data[0:4])[0]
		rest  = data[4:]
	return float

def readInt(data):
    if(len(data)<4):
        print("Error: too few bytes for int", data, len(data))
        rest = data
        integer = 0
    else:
        integer = struct.unpack(">i", data[0:4])[0]
        rest    = data[4:]
    return integer

def getAdrVal(msg):
	if b',f' in msg:
		l = msg.find(b',f')
		vals = msg[l+4:]
		adress = msg[1:l-1]
		val = readFloat(vals)
		#print(adress,':',int(400*readFloat(val)))
	elif b',i' in msg:
		l = msg.find(b',i')
		vals = msg[l+4:]
		adress = msg[1:l-1]
		val = readInt(vals)
	else:
		print('not implemented')
		val = 0
		adress = ''
	return(adress, int(200*val))
#	UDP socket server
serversocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
serversocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
serversocket.setblocking(True)
serversocket.bind(('0.0.0.0', 9000))	# only bind, no accept like in TCP
print('OSC server started')
red, green, blue = 0,255,0
while True:
	data, src = serversocket.recvfrom(1024)
	if data:
		#print(data)
		adrVal = getAdrVal(data)
        if b'Lo' in adrVal[0]:red = min(adrVal[1],255)
        if b'Mid' in adrVal[0]:green = min(adrVal[1],255)
        if b'Hi' in adrVal[0]:blue = min(adrVal[1],255)
        pycom.rgbled(red*256*256 + green*256 + blue)