sim808 POST request not sending data - post

Question

I am trying to send data to a web app using the TCP connection of a SIM808 that is connected to my NodeMcu. Everything appears to work fine, connection is perfect but at the send part, the post request does not execute fully.
below is my code and output
please help check the http_cmd line. In my output, after the content is shown in the output I am suppose to see something like Recv: ### bytes but instead I get ☐fetch over
#include <ESP8266WiFi.h>
#include <DFRobot_sim808.h>
#include <sim808.h>
#include <SoftwareSerial.h>
DFRobot_SIM808 sim808(&Serial);
char http_cmd[] = "POST /tracker/ HTTP/1.1\r\nContent-Type: application/json\r\nContent-Length: 34\r\nHost: haul1.herokuapp.com\r\n\r\n{ \"trackerId\": \"2222\",\"height\": \"42\" }";
char buffer[512];
void setup(){
//mySerial.begin(9600);
Serial.begin(9600);
//******** Initialize sim808 module *************
while(!sim808.init()) {
delay(1000);
Serial.print("Sim808 init error\r\n");
}
delay(3000);
//*********** Attempt DHCP *******************
while(!sim808.join()) {
Serial.println("Sim808 join network error");
delay(2000);
}
//************ Successful DHCP ****************
Serial.print("IP Address is ");
Serial.println(sim808.getIPAddress());
//*********** Establish a TCP connection ************
if(!sim808.connect(TCP,"haul.herokuapp.com", 80)) {
Serial.println("Connect error");
}else{
Serial.println("Connect haul.herokuapp.com success");
}
//*********** Send a GET request *****************
Serial.println("waiting to fetch...");
sim808.send(http_cmd, sizeof(http_cmd)-1);
while (true) {
int ret = sim808.recv(buffer, sizeof(buffer)-1);
if (ret <= 0){
Serial.println("fetch over...");
break;
}
buffer[ret] = '\0';
Serial.print("Recv: ");
Serial.print(ret);
Serial.print(" bytes: ");
Serial.println(buffer);
break;
}
//************* Close TCP or UDP connections **********
sim808.close();
//*** Disconnect wireless connection, Close Moving Scene *******
sim808.disconnect();
}
void loop(){
}
OUTPUT:
OUTPUT from Serial Monitor
Sim808 init error
AT
Sim808 init error
AT
AT+CFUN=1
AT+CPIN?
AT+CSTT="","",""
AT+CIICR
AT+CIFSR
IP Address is 10.10.124.205
AT+CIPSTART="TCP", “haul.herokuapp.com”, 80
Connect haul.herokuapp.com success
waiting to fetch...
AT+CIPSEND=145
POST /tracker/ HTTP/1.1
Content—Type: application/json
Content—Length: 34
Host: haul.herokuapp.com
{"trackerId": "2222","height": "42"}☐fetch over...
AT+CIPSTATUS
AT+CIPSHUT