Problem with sending data to the Thingspeak | ThingSpeak API | Forum

Hi I have a problem with my ThingSpeak, the data does not show in the Thingspeak channel. Below i will show you my codes and the results am getting in arduino. i hope to get a response from you soon am stuck with the data not showing on ThingSpeak.

#include "ESP8266WiFi.h"
#include "Wire.h"
#include Adafruit_Sensor.h
#include Adafruit_BME280.h
#include "MQ135.h"
#include Arduino.h
#define LENG 31 //0x42 + 31 bytes equal to 32 bytes
unsigned char buf[LENG];

int PM01Value=0; //define PM1.0 value of the air detector module
int PM2_5Value=0; //define PM2.5 value of the air detector module
int PM10Value=0; //define PM10 value of the air detector module
float h, t, p, pin, dp;
char temperatureFString[6];
char dpString[6];
char humidityString[6];
char pressureString[7];
char pressureInchString[6];

Adafruit_BME280 bme; // I2C
String apiKey = "UANLIHWLOU9I26I9";
// replace with your routers SSID
const char* ssid = "Bo";
// replace with your routers password
const char* password = "......";

const char* server = "api.thingspeak.com";
WiFiClient client;

void setup()
{
Serial.begin(9600);
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");

// Printing the ESP IP address
Serial.println(WiFi.localIP());

if (!bme.begin(0x76)) // set I2C 0x76 , 0x77
{
Serial.println("Could not find a valid BME280 sensor, check wiring!");
while (1);
}
}

void loop()
{
if(Serial.find(0x42)){ //start to read when detect 0x42
Serial.readBytes(buf,LENG);

if(buf[0] == 0x4d){
if(checkValue(buf,LENG)){
PM01Value=transmitPM01(buf); //count PM1.0 value of the air detector module
PM2_5Value=transmitPM2_5(buf);//count PM2.5 value of the air detector module
PM10Value=transmitPM10(buf); //count PM10 value of the air detector module
}
}
}

static unsigned long OledTimer=millis();
if (millis() - OledTimer >=1000)
{
OledTimer=millis();

Serial.print("PM1.0: ");
Serial.print(PM01Value);
Serial.println(" ug/m3");

Serial.print("PM2.5: ");
Serial.print(PM2_5Value);
Serial.println(" ug/m3");

Serial.print("PM10 : ");
Serial.print(PM10Value);
Serial.println(" ug/m3");
Serial.println();

MQ135 gasSensor = MQ135(A0);
float air_quality = gasSensor.getPPM();
Serial.print("Air Quality: ");
Serial.print(air_quality);
Serial.println(" PPM");
Serial.println();

h = bme.readHumidity();
t = bme.readTemperature();
t = t;
dp = t-0.36*(100.0-h);

p = bme.readPressure()/100.0F;
pin = 0.02953*p;
dtostrf(t, 5, 1, temperatureFString);
dtostrf(h, 5, 1, humidityString);
dtostrf(p, 6, 1, pressureString);
dtostrf(pin, 5, 2, pressureInchString);
dtostrf(dp, 5, 1, dpString);

Serial.print("Temperature = ");
Serial.println(temperatureFString);
Serial.print("Humidity = ");
Serial.println(humidityString);
Serial.print("Pressure = ");
Serial.println(pressureString);
Serial.print("Pressure Inch = ");
Serial.println(pressureInchString);
Serial.print("Dew Point = ");
Serial.println(dpString);

Serial.println("...............................................");

if (client.connect(server,80)) // "184.106.153.149" or api.thingspeak.com
{
String postStr = apiKey;
postStr +="&field1=";
postStr += String(PM01Value);
postStr +="&field2=";
postStr += String(PM2_5Value);
postStr +="&field3=";
postStr += String(PM10Value);
postStr +="&field4=";
postStr += String(air_quality);
postStr +="&field5=";
postStr += String(temperatureFString);
postStr +="&field6=";
postStr += String(humidityString);
postStr +="&field7=";
postStr += String(pressureInchString);
postStr += "

";

client.print("POST /update HTTP/1.1
");
client.print("Host: api.thingspeak.com
");
client.print("Connection: close
");
client.print("X-THINGSPEAKAPIKEY: "+apiKey+"
");
client.print("Content-Type: application/x-www-form-urlencoded
");
client.print("Content-Length: ");
client.print(postStr.length());
client.print("
");
client.print(postStr);
}
client.stop();

}

}
char checkValue(unsigned char *thebuf, char leng)
{
char receiveflag=0;
int receiveSum=0;

for(int i=0; i<(leng-2); i++){
receiveSum=receiveSum+thebuf[i];
}
receiveSum=receiveSum + 0x42;

if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1])) //check the serial data
{
receiveSum = 0;
receiveflag = 1;
}
return receiveflag;
}
int transmitPM01(unsigned char *thebuf)
{
int PM01Val;
PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module
return PM01Val;
}
//transmit PM Value to PC
int transmitPM2_5(unsigned char *thebuf)
{
int PM2_5Val;
PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module
return PM2_5Val;
}
//transmit PM Value to PC
int transmitPM10(unsigned char *thebuf)
{
int PM10Val;
PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module
return PM10Val;
}