If (millis_before + 5000 < millis()) //loop for waiting 5 seconds between messages If (Udp.begin(localPort)=1) Serial.println("port UDP is open") //starting UDP on 51115Įlse while(1) //if UDP not open, infinte bucle Serial.begin(9600) //serial com for debuggingĮthernet.begin(mac, ip) //starting Ethernet Unsigned long millis_before = millis() //variable for delaying 5 seconds the message Unsigned int localPort = 51115 // local port to listen onĬhar message\ = "hello PC!" //message intended to sended from the arduinoĬhar packetBuffer\ // UDP_TX_PACKET_MAX_SIZE = 24
#Arduino ethernet udp packet sender Pc
I tested Arduino with Raspberry with Raspbian to ensure the problem wasn't on the PC side, and the Raspberry received the same erratic UDP behaviour.Īrduino Code: #include // needed for Arduino versions later than 0018īyte mac\ = //IP of the PC.I use the standard Arduino Ethernet libraries, so I don't know what is happening and why it doesn't send anything until first message arrives to Arduino (and no idea why it is increasing each time it is sent).Here is an example of the 9th message received " PC!hello PC!!lhello PC!45hello!llo!helhello PC!hellhello!ohello PC!hello Phello PC!" (95 bytes length). The weird thing is that after this, each 5 seconds the PC receives an UDP packet, each time 9 bytes longer (hello PC! is 9 bytes message), and as in the first message received from Arduino, at the end of the message you can find "hello PC!".The message received is " C!hello hellhello PC!", so there is some kind of buffer trash with "hello PC!" at the end. First message received on PC after the ECHO, has 21 bytes (although the message sended is supposed to have 11 bytes).then, after sending a UDP message from the PC and receive the ECHO, the messages from Arduino each 5 seconds start reaching the PC. Wireshark identify tx UDP packet from PC and the same rx UDP packet from Arduino. This packed is received correctly in the Arduino and sent back to PC.
![arduino ethernet udp packet sender arduino ethernet udp packet sender](https://i.stack.imgur.com/X64FW.jpg)
A UDP package "Hello arduino!" is sent from the PC to Arduino, throught PacketSender.
![arduino ethernet udp packet sender arduino ethernet udp packet sender](https://i1.wp.com/microcontrollerslab.com/wp-content/uploads/2018/10/Arduino-Mega-2560-pinouts.jpg)
Wireshart doesn't detect any incoming packages from Arduino when it has been resetted.in the PC side I have wireshark and PacketSender to check the tx/rx UDP communication.At begining, Arduino starts sending the message "Hello PC!" each 5 seconds, but the UDP.beginPacket doesn't return 1 (as it is supposed to do when it works properly).Second block has been implemented as a ECHO (returns what receives)
![arduino ethernet udp packet sender arduino ethernet udp packet sender](https://i.ytimg.com/vi/w7Ua8lbbN0A/maxresdefault.jpg)