AT commands for reading udp packages from the esp8266?
Posted: Wed Jun 29, 2016 9:50 amHi!
I have the managed to connect to the WiFi and started to listen for UDP packages on port 5000 with the following code:
I receive the following on the serial monitor when executing the code above:
My problem now is that I am unable to receive any packages that I am sending. I think that the problem is that I have to use some AT commands to check if any packages has been received as well as the number of bytes that has been received before sending a final command that fetches the data.
I have been trying to find the relevant information about this procedure without success so I wonder if anyone here can provide some suggestions on how to achieve this?
Best regards
PQRX9000
I have the managed to connect to the WiFi and started to listen for UDP packages on port 5000 with the following code:
Code: Select all
#include <SoftwareSerial.h>
SoftwareSerial esp8266(50,51); // Rx = pin 50, Tx = pin 51
/*
* Baudrate 9600, (Set a new default baudrate with:
* AT+UART_DEF=<baudrate>,<databits>,<stopbits>,<parity>,<flow control>)
* Ex: AT+UART_DEF=9600,8,1,0,0
*
* Arduino Mega Tx (51) --> ESP8266 Rx
* Arduino Mega Rx (50) --> ESP8266 Tx
* VCC(3,3V) --> CH_PD
* VCC(3,3V) --> RESET
* VCC(3,3V) --> VCC (3,3V)
* GND --> GND
*/
const String mySSID = "\"?????\""; // Rauter name
const String myPSK = "\"?????\""; // Rauter Password
void esp8266_cmd(String cmd, int delayTime = 500)
{
Serial.println(cmd);
Serial.flush();
esp8266.println(cmd);
delay(delayTime);
while( esp8266.available() )
Serial.print((char)esp8266.read());
}
int connect_to_WiFi(int UDPport = 5000)
{
esp8266_cmd("AT+RST", 1000); // Reset device
esp8266_cmd("ATE0", 500); // ATE0 = Disable echo, ATE1 = Enable echo
esp8266_cmd("AT", 500); // Test
esp8266_cmd("AT+CWMODE=3", 1000); // Station and Access point
// Get an IP address
esp8266_cmd("AT+CWJAP=" + mySSID + "," + myPSK, 4500);
esp8266_cmd("AT+CIFSR", 500); // Print the given ip address
// UDP packet listener on UDPport (See p.44 in the datasheat)
// AT+CIPSTART=<type>,<remote IP>,<remote port>[,<UDP localport>,<UDP mode>][,<TCP keep alive>]
/*
* Examples (Single connection):
* AT+CIPSTART="TCP","192.168.101.110",1000
* AT+CIPSTART="UDP","0",0,10000,2 //http://bbs.espressif.com/viewtopic.php?t=74
*/
String cmd = "AT+CIPSTART=";
String type = "\"UDP\""; // type
String rIP = "\"0\""; // 0 : Only used for TCP
String rPort = "0"; // 0 : Only used for TCP
String udpPort = String(UDPport); // Listen for packages on this port
String udpMode = "2"; // Destination is allowed to change
String udp_setup_cmd = cmd + type + "," + rIP + "," + rPort + "," + udpPort + "," + udpMode;
Serial.print("udp_setup_cmd= "); Serial.println(udp_setup_cmd);
Serial.flush();
esp8266_cmd(udp_setup_cmd);
}
void setup() {
Serial.begin(38400);
esp8266.begin(9600);
while( !Serial ) {} // Wait for peripherals to be ready
while( !esp8266 ) {} // Wait for peripherals to be ready
int port = 5000; // Recieve packages on this port
connect_to_WiFi( port ); // Connect to WiFi and listen for UDP packages on the given port
Serial.println("Setup Complete"); // Indicate Setup Complete
}
/* Print received UDP packages from the esp8266 module */
// Not working...
void loop() {
if( esp8266.available() ){
while( esp8266.available() )
Serial.write((char)esp8266.read());
}
}
}
I receive the following on the serial monitor when executing the code above:
Code: Select all
.
.
.
WIFI CONNECTED
AT+CWJAP="?????","?????"
AT+CWJAP="?????","?????"
WIFI DISCONNECT
WIFI CONNECTAT+CIFSR
AT+CIFSR
+CIFSR:APIP,"192.168.4.1"
+CIFSR:APMAC,"1a:fe:34:fdudp_setup_cmd= AT+CIPSTART="UDP","0",0,5000,2
AT+CIPSTART="UDP","0",0,5000,2
AT+CIPSTART="UDP","0",0,5000,2
0,CONNECT
OK
Setup Complete
My problem now is that I am unable to receive any packages that I am sending. I think that the problem is that I have to use some AT commands to check if any packages has been received as well as the number of bytes that has been received before sending a final command that fetches the data.
I have been trying to find the relevant information about this procedure without success so I wonder if anyone here can provide some suggestions on how to achieve this?
Best regards
PQRX9000