Hi, I am using ESP8266 as my Access point and want to receive information from 2 remote arduino devices simultaneously. I am just able to get the information from one of those remote arduinos. My code at the access point is given as under:
`#include
include
include
include
//These are the avariables you can change for your project. For example, change the SSID (network ID), change the ports on both machines.
//The most useful one is the LOOP_DELAY which changes how quicly it refreshes. set to 100ms be default.
char ssid[] = "ESPAP"; // your network SSID (name)
char password[] = "mPass@54321"; //Set the AP's password
unsigned int localPort = 2390; // local port to listen on
define LOOP_DELAY 10 //how fast we check for new data
define ARRAYSIZE 255 //size of message array (255bytes)
//global variables
IPAddress remoteIp;
int remoteUDPPort;
char packetBuffer[ARRAYSIZE]; //buffer to hold incoming packet
int arraySize = ARRAYSIZE;
char inData[ARRAYSIZE]; // Allocate some space for the string
char inChar; // Where to store the character read
byte aindex = 0; // Index into array; where to store the character
boolean dataToSend = false;
WiFiUDP Udp;
void setup()
{
Serial.begin(BAUD_RATE);
/ You can remove the password parameter if you want the AP to be open. /
WiFi.softAP(ssid, password); //Start AP
// IPAddress myIP = WiFi.softAPIP(); if ever in doubt on this devices IP address you can get it here. Should be 192.168.4.1
Udp.begin(localPort);
WiFi.setSleepMode(WIFI_NONE_SLEEP);
}
void loop() {
while(Serial.available() > 0) //check for something to read from serial port
{
if(aindex < (arraySize-1)) // One less than the size of the array
{
inChar = Serial.read(); // Read a character
inData[aindex] = inChar; // Store it
aindex++; // Increment where to write next
inData[aindex] = '\0'; // Null terminate the string
}
dataToSend = true;
}
//check for incoming data via UDP
int packetSize = Udp.parsePacket();
if (packetSize)
{
remoteIp = Udp.remoteIP();
remoteUDPPort = Udp.remotePort();
int len = Udp.read(packetBuffer, 255); //read in the packet
if (len > 0)
{
packetBuffer[len] = 0;
}
Serial.println(packetBuffer);
}
// send UDP Data - this sends data to the last device it receives data from. For a one to one link this is fine. If there are multiple clients then this may need to be adjusted to store and send to all clients.
if(dataToSend)
{
if(Udp.beginPacket(remoteIp, remoteUDPPort))
{
Udp.write(inData);
Udp.endPacket();
//Serial.println(inData); //Uncomment this line for a local echo of the data sent
}
else
{
Serial.println("No connection");
}
dataToSend = false; //set the flag to false, ie only send when you need to.
for (aindex=0; aindex < arraySize; aindex++) //wipe the array
{
inData[aindex] = '\0'; // Null terminate the string
}
aindex = 0; //reset the index
}
}`
The information sent by remote devices are preceded by an identifier A01, B01. The information received from one remote device is :
Hi, I am using ESP8266 as my Access point and want to receive information from 2 remote arduino devices simultaneously. I am just able to get the information from one of those remote arduinos. My code at the access point is given as under: `#include
include
include
include
//These are the avariables you can change for your project. For example, change the SSID (network ID), change the ports on both machines. //The most useful one is the LOOP_DELAY which changes how quicly it refreshes. set to 100ms be default. char ssid[] = "ESPAP"; // your network SSID (name) char password[] = "mPass@54321"; //Set the AP's password unsigned int localPort = 2390; // local port to listen on
define LOOP_DELAY 10 //how fast we check for new data
define ARRAYSIZE 255 //size of message array (255bytes)
define BAUD_RATE 115200 //serial comunication speed
//global variables IPAddress remoteIp; int remoteUDPPort; char packetBuffer[ARRAYSIZE]; //buffer to hold incoming packet int arraySize = ARRAYSIZE; char inData[ARRAYSIZE]; // Allocate some space for the string char inChar; // Where to store the character read byte aindex = 0; // Index into array; where to store the character boolean dataToSend = false; WiFiUDP Udp; void setup() { Serial.begin(BAUD_RATE); / You can remove the password parameter if you want the AP to be open. / WiFi.softAP(ssid, password); //Start AP // IPAddress myIP = WiFi.softAPIP(); if ever in doubt on this devices IP address you can get it here. Should be 192.168.4.1 Udp.begin(localPort); WiFi.setSleepMode(WIFI_NONE_SLEEP); } void loop() { while(Serial.available() > 0) //check for something to read from serial port { if(aindex < (arraySize-1)) // One less than the size of the array { inChar = Serial.read(); // Read a character inData[aindex] = inChar; // Store it aindex++; // Increment where to write next inData[aindex] = '\0'; // Null terminate the string } dataToSend = true; } //check for incoming data via UDP int packetSize = Udp.parsePacket(); if (packetSize) { remoteIp = Udp.remoteIP(); remoteUDPPort = Udp.remotePort(); int len = Udp.read(packetBuffer, 255); //read in the packet if (len > 0) { packetBuffer[len] = 0; } Serial.println(packetBuffer); } // send UDP Data - this sends data to the last device it receives data from. For a one to one link this is fine. If there are multiple clients then this may need to be adjusted to store and send to all clients. if(dataToSend) { if(Udp.beginPacket(remoteIp, remoteUDPPort)) { Udp.write(inData); Udp.endPacket(); //Serial.println(inData); //Uncomment this line for a local echo of the data sent } else { Serial.println("No connection"); } dataToSend = false; //set the flag to false, ie only send when you need to. for (aindex=0; aindex < arraySize; aindex++) //wipe the array { inData[aindex] = '\0'; // Null terminate the string } aindex = 0; //reset the index }
}` The information sent by remote devices are preceded by an identifier A01, B01. The information received from one remote device is :
B01 23.00 2384 916.35 5.14 0.000 5.00 -23.00 B01 23.00 2412 916.35 5.14 0.000 5.00 -23.00 B01 23.00 2466 916.35 5.15 0.000 5.00 -23.00
whereas i do not receive from A01. Kindly suggest. Many thanks