esp8266 wifi access point does not accept more than 1 client

Start at the WiFi.softAP setup and the UDP handling in the sketch. Trace how remoteIp and remoteUDPPort are updated when packets arrive, and how outgoing data is sent after serial input. Test with both A01 and B01 clients and consider the behavior complete when information from both clients is received and handled simultaneously.

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 <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <WiFiUdp.h>
#include <TimeLib.h>

//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