How to send data from Arduino Nano 33 IoT to Matlab using UDP over WIFI

Question

Ibrahim alami merroui 2023-2-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1909855-how-to-send-data-from-arduino-nano-33-iot-to-matlab-using-udp-over-wifi

评论： Ibrahim alami merroui 2023-2-11

Hey,

I'm trying to send data from Arduino Nano 33 IoT (has WIFI chip) to Matlab using UDP. The gateway is the router. I wrote two codes for Arduino and Matlab but i'm geetting not data (ReplyBuffer).

IP-Adress from Arduino:

SSID: MagentaWLAN-6XU4
signal strength (RSSI):-62 dBm
Local IP: 192.168.2.50
Subnet Mask: 255.255.255.0
Gateway IP: 192.168.2.1

Matlab Code

remPort=8888;      
host='192.168.2.50';  
locPort=50001;
u = udp(host,'RemotePort',remPort,'LocalPort',locPort); 
fopen(u)
A = fread(u);
fclose(u)

Arduino Code:

#include <WiFi.h>
#include <WiFiUdp.h>
int status = WL_IDLE_STATUS;
char ssid[] = "MagentaWLAN-6XU4"; //  your network SSID (name)
char pass[] = "11980331210951165236";    // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;            // your network key Index number (needed only for WEP)
unsigned int localPort = 8888;
char  ReplyBuffer[] = { 2, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; 
WiFiUDP Udp;
void setup() {
  Serial.begin(115200);
// einmaliger Gebrauch
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
 
  String fv = WiFi.firmwareVersion();
  if (fv != "1.1.0") {
    Serial.println("Please upgrade the firmware");
  }
  // attempt to connect to Wifi network:
  while (status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, keyIndex, pass);   // Das habe ich eingefügt
    // wait 10 seconds for connection:
    delay(10000);
  }
  Serial.println("Connected to wifi");
  printWifiStatus();
  Serial.println("\nStarting connection to server...");
  // if you get a connection, report back via serial:
  Udp.begin(localPort);
}
void loop() {
  
  int packetSize = Udp.parsePacket();
    // send a reply, to the IP address and port that sent us the packet we received
    Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
// da werden dann unsere Daten an Matlab geschikt
    Udp.write(ReplyBuffer);
    Udp.endPacket();
  
  }

The error I'm getting in Matlab:

  Warning: udp will be removed in a future release. Use udpport instead. 
Warning: Unsuccessful read:  The specified amount of data was not returned within the Timeout period.
'udp' unable to read any data. For more information on possible reasons, see UDP Read Warnings. 

and the Data (A) is empty.

Does someone see where is the Problem in the code?

7 个评论
显示 5更早的评论隐藏 5更早的评论

Ibrahim alami merroui 2023-2-11

在 MATLAB Online 中打开

Thanks for the reply.

The message i'm getting is:

Please upgrade the firmware
Attempting to connect to SSID: MagentaWLAN-6XU4
Connected to wifi
SSID: MagentaWLAN-6XU4
IP Address: 192.168.2.50
signal strength (RSSI):-65 dBm
Local IP: 192.168.2.50
Subnet Mask: 255.255.255.0
Gateway IP: 192.168.2.1
Starting connection to server...
the connection was established

I did upgrade the Firmware and turn the fireware off in case this is the problem, but it didn't work.

The second thing I changed is this command :

Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());

to

Udp.beginPacket(remoteIP,Udp.remotePort());

and I gave in remoteIP the IP adress of the Gateway in matloab and Arduino IDE, but also didn't work.

I saw the code you sent, it says first of all Matlab will send a message then Arduino is just going to reply when a message has been recieved.

My code i wrote above sends a message and dosen't recieve anything.

I have maybe in this case some questions:

Wich port and IP adress schould i use for the transfer ?

Why i can't give the IP-Adress and the Port in UDPPORT() ?

I tried to write a code to use it with Arduino Code you suggested but it doesn't work :::(((

Walter Roberson 2023-2-11

I would not worry about the firmware thing at the moment; the code is written in such a way that it would also complain if you had a newer firmware.

Have you tried using the packet generation program mentioned in https://arduino-esp8266.readthedocs.io/en/latest/esp8266wifi/udp-examples.html to see whether it can see a response? We need to distinguish between "no reply packet is really being generated" and "reply packet is generated but is sent to wrong place" and "reply packet is being correctly generated but MATLAB specifically is having problems with it"

Ibrahim alami merroui 2023-2-11

在 MATLAB Online 中打开

thanks for the reply.

I couldn't upload the code you shared, but i have used this code Send and Receive UDP String | Arduino Documentation | Arduino Documentation. I think it does the same work. I downloaded the Packet Sender App for Windows. After I uploaded the sketch on Arduino IDE I sent directly a messag from the App and I got the reply.

Serial Monitor:

Starting connection to server...
Received packet of size 13
From 192.168.2.41, port 53988
Contents:
hello ibrahim

The problem i see that i can't make any communication beetween matlab and packet sender app. I used this code:

remPort=18;      
 host='192.168.2.50';  
 locPort=19;
 u = udp(host,'RemotePort',remPort,'LocalPort',locPort) 
 fopen(u)
 A = fread(u);
 write('hey');
 fclose(u)

I think i should use udpport() instead of udp. With this code i'm getting not packets or receiving it from the app.

If I use the port 53988 as remPort to send data, matlab says:

 Error using icinterface/fopen
Unsuccessful open: Address already in use: Cannot bind

In this case the reply packet is generated but is sent to wrong place and matlab can't receive anything.

请先登录，再进行评论。

请先登录，再回答此问题。

How to send data from Arduino Nano 33 IoT to Matlab using UDP over WIFI

7 个评论
显示 5更早的评论隐藏 5更早的评论

回答（0 个）

另请参阅

类别

标签

Community Treasure Hunt

How to send data from Arduino Nano 33 IoT to Matlab using UDP over WIFI

7 个评论 显示 5更早的评论隐藏 5更早的评论

回答（0 个）

另请参阅

类别

标签

Community Treasure Hunt

7 个评论
显示 5更早的评论隐藏 5更早的评论