ESP8266 crashes receiving UDP Packets
Posted: Wed Feb 10, 2016 5:44 amH, I have the following code to receive UDP packets from my smartphone:
No, when I send packets that are until 3 bytes long, the packets are received OK. When I send packets that are 4 bytes long, I start to receive this weird characters in the end of the packet. And when I receive packets that are 5+ bytes long, the ESP8266 crashes and returns the following error in the serial:
I've heard of issues related to power supply, but I've tested it with several devices and they all return the same behaviour, so I'm assuming this is something related to the code. Any clues?
Code: Select all
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <WiFiClient.h>
WiFiServer server(80);
//UDP
WiFiUDP Udp;
#define SERVER_PORT 80
char packetBuffer[] = ""; //buffer to hold incoming packet
int PACKET_MAX_SIZE = 24;
int packetSize;
void receiveUDP() {
packetSize = Udp.parsePacket();
if (packetSize) {
Serial.print("Packetsize: ");
Serial.println(packetSize);
// read the packet into packetBufffer
Udp.read(packetBuffer, PACKET_MAX_SIZE);
Serial.println(packetBuffer);
for (int i = 0; i < PACKET_MAX_SIZE; i++) {
packetBuffer[i] = 0;
}
}
}
void openAP() {
WiFi.softAP("NodeMCU");
delay(1000);
Serial.print("IP: ");
Serial.println(WiFi.softAPIP());
}
void setup() {
Serial.begin(115200);
WiFi.mode(WIFI_AP);
//Open Access Point
openAP();
Udp.begin(80);
//server.begin();
}
void loop() {
receiveUDP();
}
No, when I send packets that are until 3 bytes long, the packets are received OK. When I send packets that are 4 bytes long, I start to receive this weird characters in the end of the packet. And when I receive packets that are 5+ bytes long, the ESP8266 crashes and returns the following error in the serial:
Code: Select all
Packetsize: 1
1
Packetsize: 2
12
Packetsize: 3
123
Packetsize: 4
1234Єþ?
Packetsize: 5
12345„þ?
Packetsize: 5
Exception (9):
epc1=0x402018ec epc2=0x00000000 epc3=0x00000000 excvaddr=0x3ffe8465 depc=0x00000000
ctx: cont
sp: 3ffef930 end: 3ffefb20 offset: 01a0
>>>stack>>>
3ffefad0: 3ffee950 3ffeeabc 3ffee948 402018e4
3ffefae0: 00000000 00000000 00000016 3ffeeaf0
3ffefaf0: 3fffdc20 00000000 3ffeeae8 40201920
3ffefb00: 00000000 00000000 00000000 40202d9d
3ffefb10: 00000000 00000000 3ffeeb00 40100114
<<<stack<<<
ets Jan 8 2013,rst cause:2, boot mode:(3,6)
load 0x4010f000, len 1264, room 16
tail 0
chksum 0x42
csum 0x42
~ld
IP do Access Point: 192.168.4.1
I've heard of issues related to power supply, but I've tested it with several devices and they all return the same behaviour, so I'm assuming this is something related to the code. Any clues?