Bulb doesn't respond to SSDP requests

Yeelight LED Bulb (Color)
#1

Hello,i have some problem with bulb, what is wrong with this code and why it’s not work?

net.multicastJoin(wifi.sta.getip(), “239.255.255.250”)

local ssdp_search = “M-SEARCH * HTTP/1.1\r\n”…
“HOST: 239.255.255.250:1982\r\n”…
“MAN: “ssdp:discover”\r\n”…
“ST: wifi_bulb\r\n”

local function notify()

    UPnP = net.createConnection(net.UDP)
    --UPnP:connect(1982,"239.255.255.250")
    UPnP:send(1982,"239.255.255.250",ssdp_search)
    print("Searching")
    UPnP:close()
    UPnP = nil
    notify = nil
    collectgarbage()

end

tmr.alarm(3, 10000, 1, notify)

Screenshot from wireshark:
192.168.0.172 - my NodeMcu microcontroller, where this code is located

Скриншот (2018.05.29 17-00-42).jpg1104×667 362 KB

And this is your “Windows demo” from here https://www.yeelight.com/en_US/developer
192.168.0.120 - my notebook
192.168.0.189 - Yeelight bulb

Скриншот (2018.05.29 17-37-58).jpg1012×622 300 KB

Thanks for help!

#2

Hi,

Please try removing the trailing “\r\n”.

br,

#3

Hi,nothing change

#4

I have the same problem, Do you have resolved this?

#5

Most of the time my colour Yeelight bulb responds okay to SSDP requests. But every now and then it stops doing so. There doesn’t seem to be any pattern. I’ve tried sending requests every 5 seconds with a 2 second timeout for responses: the bulb will respond many times and then stop responding, starting again between one and 5 minutes later. I’ve been watching with tcpdump:

tcpdump -i wlan0 -s0 -vv udp -A

The code I am using is in Python from the Yeelight package by Stavros Korokithakis

import os
import socket
import struct
import json

try:
    from urllib.parse import urlparse
except ImportError:
    from urlparse import urlparse


def discover_bulbs(timeout=2, interface=False):
    msg = "\r\n".join(["M-SEARCH * HTTP/1.1", "HOST: 239.255.255.250:1982", 'MAN: "ssdp:discover"', "ST: wifi_bulb"])

    # Set up UDP socket
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
    s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 32)
    if interface:
        s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_IF, 
                             socket.inet_aton(get_ip_address(interface)))
    s.settimeout(timeout)
    s.sendto(msg.encode(), ("239.255.255.250", 1982))

    bulbs = []
    bulb_ips = set()
    while True:
        try:
            data, addr = s.recvfrom(65507)
        except socket.timeout:
            print('Timeout')
            break

        capabilities = dict([x.strip("\r").split(": ") for x in data.decode().split("\n") if ":" in x])
        parsed_url = urlparse(capabilities["Location"])

        bulb_ip = (parsed_url.hostname, parsed_url.port)
        if bulb_ip in bulb_ips:
            continue

        capabilities = {key: value for key, value in capabilities.items() if key.islower()}
        bulbs.append({"ip": bulb_ip[0], "port": bulb_ip[1], "capabilities": capabilities})
        bulb_ips.add(bulb_ip)

    return bulbs


bulbs = discover_bulbs(timeout = 10)
print(str(bulbs))