Code: Select all
# Borrowed from Andrew http://forum.micropython.org/viewtopic.php?t=1101#p6545
import network
import lwip
from time import sleep
def mtStr(s):
return bytes([len(s) >> 8, len(s) & 255]) + s.encode('utf-8')
def mtPacket(cmd, variable, payload):
return bytes([cmd, len(variable) + len(payload)]) + variable + payload
def mtpConnect(name):
return mtPacket(
0b00010000,
mtStr("MQTT") + # protocol name
b'\x04' + # protocol level
b'\x00' + # connect flag
b'\xFF\xFF', # keepalive
mtStr(name)
)
def mtpDisconnect():
return bytes([0b11100000, 0b00000000])
def mtpPub(topic, data):
return mtPacket(0b00110001, mtStr(topic), data)
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect('essid', 'password')
print('Connected =',wlan.isconnected())
s = lwip.socket()
s.connect('xx.xx...', 1883)
s.send(mtpConnect("somename"))
time.sleep(2)
s.send(mtpPub("topic...", b'message'))
s.send(mtpDisconnect())
s.close()