UDP Insane Packet loss ... help?
Posted: Thu Apr 22, 2021 3:31 pmSo disclaimer. I half have no idea what I'm doing... So I'll start by saying that a while back I bought the following off Amazon UK:
Anyway. I want to use this to trigger a relay wirelessly over my WiFi. I want this response to be as near instant as possible, and the first time I used these chips I ran into issues with delays using TCP, so I thought "I'll use UDP". The idea being that we're within network, so packet loss should be extremely low, and I can just handle resending data if I don't get responses within X amount of time as a backup.
Anyway, I wrote this (using Platform.IO in VSCode):
That's the simplest code I can think of to print useful information from a UDP packet.
Anyway I then used the following Python code:
So just sending triple bursts of messages every 4 seconds. I have tested this with my phone. Every single message makes it through the router, every single time. When sending to my phone (on the same WiFi), it literally never fails. But from my ESP8266 I get the following:
The first packet is pretty much guaranteed to fail. And then it's hit and miss wether any given batch will make it through (it does tend to alternate passing and failng). But do note, it NEVER fails just 1 of the packets in a block of 3. It's always an all or nothing type thing.
I would appreciate any help here... A near 50% packet loss is a little to high for me to sustain. Something I have noticed. The longer I leave it between sending packets, the more likely it is to fail. It's basically completely unusable like this though.
Am I doing something horribly wrong? I'd appreciate any and all help!
Regards,
Pluckerpluck
MakerHawk 3pcs ESP8266 NodeMCU LUA CP2102 ESP-12E WiFi Internet Development Board Serial Wireless Module for Arduino IDE/Micropython New Version
Anyway. I want to use this to trigger a relay wirelessly over my WiFi. I want this response to be as near instant as possible, and the first time I used these chips I ran into issues with delays using TCP, so I thought "I'll use UDP". The idea being that we're within network, so packet loss should be extremely low, and I can just handle resending data if I don't get responses within X amount of time as a backup.
Anyway, I wrote this (using Platform.IO in VSCode):
Code: Select all
#include <Arduino.h>
#include <ESP8266WiFi.h> // Include the Wi-Fi library
#include <WiFiUdp.h>
// Save the WIFI settings
const char* ssid = "REDACTED";
const char* password = "REDACTED";
// WIFI Setup
WiFiUDP Udp;
unsigned int localUdpPort = 4210;
char incomingPacket[256];
void setup() {
// Start the Serial communication to send messages to the computer
Serial.begin(9600);
delay(10);
// Connect to the WiFi
WiFi.begin(ssid, password);
// Wait for the WiFi signal
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
}
// Listen
Udp.begin(localUdpPort);
}
void loop() {
// Try reading the next packet
int packetSize = Udp.parsePacket();
if (packetSize)
{
int len = Udp.read(incomingPacket, 255);
if (len > 0) incomingPacket[len] = 0;
Serial.printf(
"Received %d bytes from %s, port %d: %s\n",
packetSize,
Udp.remoteIP().toString().c_str(),
Udp.remotePort(),
incomingPacket
);
}
}
That's the simplest code I can think of to print useful information from a UDP packet.
Anyway I then used the following Python code:
Code: Select all
import socket
import time
UDP_IP = "REDACTED (Even if it's internal...)"
UDP_PORT = 4210
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
i = 1
while True:
print("Sent", i)
sock.sendto(bytes(str(i), "utf-8"), (UDP_IP, UDP_PORT))
sock.sendto(bytes(str(i), "utf-8"), (UDP_IP, UDP_PORT))
sock.sendto(bytes(str(i), "utf-8"), (UDP_IP, UDP_PORT))
i += 1
time.sleep(4)
So just sending triple bursts of messages every 4 seconds. I have tested this with my phone. Every single message makes it through the router, every single time. When sending to my phone (on the same WiFi), it literally never fails. But from my ESP8266 I get the following:
Code: Select all
Received 1 bytes from <REDACTED>, port 63661: 2
Received 1 bytes from <REDACTED>, port 63661: 2
Received 1 bytes from <REDACTED>, port 63661: 2
Received 1 bytes from <REDACTED>, port 63661: 4
Received 1 bytes from <REDACTED>, port 63661: 4
Received 1 bytes from <REDACTED>, port 63661: 4
Received 1 bytes from <REDACTED>, port 63661: 6
Received 1 bytes from <REDACTED>, port 63661: 6
Received 1 bytes from <REDACTED>, port 63661: 6
Received 1 bytes from <REDACTED>, port 63661: 8
Received 1 bytes from <REDACTED>, port 63661: 8
Received 1 bytes from <REDACTED>, port 63661: 8
Received 1 bytes from <REDACTED>, port 63661: 9
Received 1 bytes from <REDACTED>, port 63661: 9
Received 1 bytes from <REDACTED>, port 63661: 9
Received 2 bytes from <REDACTED>, port 63661: 11
Received 2 bytes from <REDACTED>, port 63661: 11
Received 2 bytes from <REDACTED>, port 63661: 11
Received 2 bytes from <REDACTED>, port 63661: 13
Received 2 bytes from <REDACTED>, port 63661: 13
Received 2 bytes from <REDACTED>, port 63661: 13
Received 2 bytes from <REDACTED>, port 63661: 14
Received 2 bytes from <REDACTED>, port 63661: 14
Received 2 bytes from <REDACTED>, port 63661: 14
Received 2 bytes from <REDACTED>, port 63661: 15
Received 2 bytes from <REDACTED>, port 63661: 15
Received 2 bytes from <REDACTED>, port 63661: 15
Received 2 bytes from <REDACTED>, port 63661: 16
Received 2 bytes from <REDACTED>, port 63661: 16
Received 2 bytes from <REDACTED>, port 63661: 16
Received 2 bytes from <REDACTED>, port 63661: 18
Received 2 bytes from <REDACTED>, port 63661: 18
Received 2 bytes from <REDACTED>, port 63661: 18
The first packet is pretty much guaranteed to fail. And then it's hit and miss wether any given batch will make it through (it does tend to alternate passing and failng). But do note, it NEVER fails just 1 of the packets in a block of 3. It's always an all or nothing type thing.
I would appreciate any help here... A near 50% packet loss is a little to high for me to sustain. Something I have noticed. The longer I leave it between sending packets, the more likely it is to fail. It's basically completely unusable like this though.
Am I doing something horribly wrong? I'd appreciate any and all help!
Regards,
Pluckerpluck
