LilyGO-T-SIM7000G
LilyGO-T-SIM7000G copied to clipboard
Published
20 hours ago •
Xinyuan-LilyGO
Xinyuan-LilyGO
Http connection problem after 1 hour
Hi all. I am doing some tests with an ESP32 Lilygo TTGO SIM7000 and I have warned that there is a problem with HTTP after some time sending data.
When I turn on the ESP32 it works correctly and after about an hour of sending data, the connection fails and it does not connect again.
This is the code. Any suggestion?
#define SerialMon Serial
// Set serial for AT commands (to the module)`
// Use Hardware Serial on Mega, Leonardo, Micro
#define SerialAT Serial1
#define TINY_GSM_MODEM_SIM7000
#define TINY_GSM_RX_BUFFER 1024 // Set RX buffer to 1Kb
// See all AT commands, if wanted
// #define DUMP_AT_COMMANDS
// set GSM PIN, if any
#define GSM_PIN "XXXX"
// Your GPRS credentials, if any
const char apn[] = "datos";
const char gprsUser[] = "";
const char gprsPass[] = "";
const char server[] = "xxxxxxxxxxx.xxx";
const char coords[] = "/coords";
const int port = 80;
#include <TinyGsmClient.h>
#include <ArduinoHttpClient.h>
#include <ArduinoJson.h>
#define DUMP_AT_COMMANDS
#ifdef DUMP_AT_COMMANDS
#include <StreamDebugger.h>
StreamDebugger debugger(SerialAT, SerialMon);
TinyGsm modem(debugger);
#else
TinyGsm modem(SerialAT);
#endif
TinyGsmClient client(modem);
HttpClient http(client, server, port);
#define uS_TO_S_FACTOR 1000000ULL // Conversion factor for micro seconds to seconds
#define TIME_TO_SLEEP 60 // Time ESP32 will go to sleep (in seconds)
#define UART_BAUD 115200
#define PIN_DTR 25
#define PIN_TX 27
#define PIN_RX 26
#define PWR_PIN 4
#define SD_MISO 2
#define SD_MOSI 15
#define SD_SCLK 14
#define SD_CS 13
#define LED_PIN 12
void modemPowerOn()
{
pinMode(PWR_PIN, OUTPUT);
digitalWrite(PWR_PIN, LOW);
delay(1000); //Datasheet Ton mintues = 1S
digitalWrite(PWR_PIN, HIGH);
}
void modemPowerOff()
{
pinMode(PWR_PIN, OUTPUT);
digitalWrite(PWR_PIN, LOW);
delay(1500); //Datasheet Ton mintues = 1.2S
digitalWrite(PWR_PIN, HIGH);
}
void modemRestart()
{
modemPowerOff();
delay(1000);
modemPowerOn();
}
void enableGPS(void)
{
// Set SIM7000G GPIO4 LOW ,turn on GPS power
// CMD:AT+SGPIO=0,4,1,1
// Only in version 20200415 is there a function to control GPS power
Serial.println("Start positioning . Make sure to locate outdoors.");
Serial.println("The blue indicator light flashes to indicate positioning.");
modem.sendAT("+SGPIO=0,4,1,1");
if (modem.waitResponse(10000L) != 1)
{
DBG(" SGPIO=0,4,1,1 false ");
}
modem.enableGPS();
}
void disableGPS(void)
{
// Set SIM7000G GPIO4 LOW ,turn off GPS power
// CMD:AT+SGPIO=0,4,1,0
// Only in version 20200415 is there a function to control GPS power
modem.sendAT("+SGPIO=0,4,1,0");
if (modem.waitResponse(10000L) != 1)
{
DBG(" SGPIO=0,4,1,0 false ");
}
modem.disableGPS();
}
void sendCoords(float lat, float lon)
{
// Prepare JSON document
StaticJsonDocument<200> doc;
doc["lat"] = lat;
doc["lon"] = lon;
// Serialize JSON document
String json;
serializeJson(doc, json);
int err = http.post(coords, "application/json", json);
if (err != 0)
{
SerialMon.println(F("failed to connect"));
delay(10000);
return;
}
int status = http.responseStatusCode();
if (!status)
{
delay(10000);
return;
}
String body = http.responseBody();
SerialMon.println(F("Response:"));
SerialMon.println(body);
// Shutdown
http.stop();
SerialMon.println(F("Server disconnected"));
}
void setup()
{
// Set console baud rate
SerialMon.begin(115200);
delay(10);
// Set LED OFF
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, HIGH);
SerialAT.begin(UART_BAUD, SERIAL_8N1, PIN_RX, PIN_TX);
delay(10000);
modemPowerOn();
Serial.println("Initializing modem...");
if (!modem.restart())
{
Serial.println("Failed to restart modem, attempting to continue without restarting");
}
// String modemInfo = modem.getModemInfo();
// SerialMon.print("Modem Info: ");
// SerialMon.println(modemInfo);
// Unlock your SIM card with a PIN if needed
if (GSM_PIN && modem.getSimStatus() != 3)
{
modem.simUnlock(GSM_PIN);
}
}
void loop()
{
// GPRS connection parameters are usually set after network registration
SerialMon.print(F("Connecting to "));
SerialMon.print(apn);
if (!modem.gprsConnect(apn, gprsUser, gprsPass))
{
SerialMon.println(" fail");
delay(10000);
return;
}
SerialMon.println(" success");
if (modem.isGprsConnected())
{
SerialMon.println("GPRS connected");
}
enableGPS();
float lat, lon;
while (1)
{
if (modem.getGPS(&lat, &lon))
{
sendCoords(lat, lon);
}
digitalWrite(LED_PIN, !digitalRead(LED_PIN));
delay(7500);
}
}
Successful http request AT dump commands.
10:23:58.141 -> 0, CONNECT OK
10:23:58.141 -> AT+CIPSEND=0,4
10:23:58.141 ->
10:23:58.141 -> >POST
10:23:58.141 -> DATA ACCEPT:0,4
10:23:58.141 -> AT+CIPSEND=0,1
10:23:58.141 ->
10:23:58.141 -> DATA ACCEPT:0,1
10:23:58.141 -> AT+CIPSEND=0,7
10:23:58.141 ->
10:23:58.141 -> >/coords
10:23:58.174 -> DATA ACCEPT:0,7
10:23:58.174 -> AT+CIPSEND=0,9
10:23:58.174 ->
10:23:58.174 -> > HTTP/1.1
10:23:58.174 -> DATA ACCEPT:0,9
10:23:58.174 -> AT+CIPSEND=0,2
10:23:58.174 ->
10:23:58.174 -> DATA ACCEPT:0,2
10:23:58.174 -> AT+CIPSEND=0,6
10:23:58.174 ->
10:23:58.174 -> >Host:
10:23:58.174 -> DATA ACCEPT:0,6
10:23:58.174 -> AT+CIPSEND=0,24
10:23:58.174 ->
10:23:58.174 -> >xxx.xxxx.com
10:23:58.174 -> DATA ACCEPT:0,24
10:23:58.174 -> AT+CIPSEND=0,2
10:23:58.174 ->
10:23:58.174 -> DATA ACCEPT:0,2
10:23:58.207 -> AT+CIPSEND=0,10
10:23:58.207 ->
10:23:58.207 -> >User-Agent
10:23:58.207 -> DATA ACCEPT:0,10
10:23:58.207 -> AT+CIPSEND=0,2
10:23:58.207 ->
10:23:58.207 -> DATA ACCEPT:0,2
10:23:58.207 -> AT+CIPSEND=0,13
10:23:58.207 ->
10:23:58.207 -> >Arduino/2.2.0
10:23:58.207 -> DATA ACCEPT:0,13
10:23:58.207 -> AT+CIPSEND=0,2
10:23:58.207 ->
10:23:58.207 -> DATA ACCEPT:0,2
10:23:58.207 -> AT+CIPSEND=0,10
10:23:58.207 ->
10:23:58.207 -> >Connection
10:23:58.207 -> DATA ACCEPT:0,10
10:23:58.207 -> AT+CIPSEND=0,2
10:23:58.207 ->
10:23:58.241 -> DATA ACCEPT:0,2
10:23:58.241 -> AT+CIPSEND=0,5
10:23:58.241 ->
10:23:58.241 -> >close
10:23:58.241 -> DATA ACCEPT:0,5
10:23:58.241 -> AT+CIPSEND=0,2
10:23:58.241 ->
10:23:58.241 -> DATA ACCEPT:0,2
10:23:58.241 -> AT+CIPSEND=0,12
10:23:58.241 ->
10:23:58.241 -> >Content-Type
10:23:58.241 -> DATA ACCEPT:0,12
10:23:58.241 -> AT+CIPSEND=0,2
10:23:58.241 ->
10:23:58.241 -> DATA ACCEPT:0,2
10:23:58.241 -> AT+CIPSEND=0,16
10:23:58.241 ->
10:23:58.241 -> >application/json
10:23:58.241 -> DATA ACCEPT:0,16
10:23:58.241 -> AT+CIPSEND=0,2
10:23:58.274 ->
10:23:58.274 -> DATA ACCEPT:0,2
10:23:58.274 -> AT+CIPSEND=0,14
10:23:58.274 ->
10:23:58.274 -> >Content-Length
10:23:58.274 -> DATA ACCEPT:0,14
10:23:58.274 -> AT+CIPSEND=0,2
10:23:58.274 ->
10:23:58.274 -> DATA ACCEPT:0,2
10:23:58.274 -> AT+CIPSEND=0,2
10:23:58.274 ->
10:23:58.274 -> >31
10:23:58.274 -> DATA ACCEPT:0,2
10:23:58.274 -> AT+CIPSEND=0,2
10:23:58.274 ->
10:23:58.274 -> DATA ACCEPT:0,2
10:23:58.274 -> AT+CIPSEND=0,2
10:23:58.274 ->
10:23:58.307 -> DATA ACCEPT:0,2
10:23:58.307 -> AT+CIPSEND=0,31
10:23:58.307 ->
10:23:58.307 -> >{"lat":XX.XXXXX,"lon":X.XXXXXX}
10:23:58.307 -> DATA ACCEPT:0,31
10:23:58.307 -> AT+CIPRXGET=4,0
10:23:58.307 ->
10:23:58.307 -> +CIPRXGET: 4,0,0
10:23:58.307 ->
10:23:58.307 -> OK
10:23:58.307 -> AT+CIPSTATUS=0
10:23:58.307 ->
10:23:58.307 -> +CIPSTATUS: 0,0,"TCP","XX.XXX.XXX.XX","80","CONNECTED"
10:23:58.307 ->
10:23:58.307 -> OK
10:23:59.308 -> AT+CIPRXGET=4,0
10:23:59.308 ->
10:23:59.308 -> +CIPRXGET: 1,0
10:23:59.308 ->
10:23:59.308 -> +CIPRXGET: 4,0,126
10:23:59.308 ->
10:23:59.308 -> OK
10:23:59.308 -> AT+CIPSTATUS=0
10:23:59.308 ->
10:23:59.308 -> +CIPSTATUS: 0,0,"TCP","XX.XXX.XXX.XX","80","REMOTE CLOSING"
10:23:59.341 ->
10:23:59.341 -> OK
10:24:00.341 -> AT+CIPRXGET=4,0
10:24:00.341 ->
10:24:00.341 -> +CIPRXGET: 4,0,126
10:24:00.341 ->
10:24:00.341 -> OK
10:24:00.341 -> AT+CIPRXGET=2,0,126
10:24:00.341 ->
10:24:00.341 -> +CIPRXGET: 2,0,126,0
10:24:00.341 -> HTTP/1.1 200 OK
10:24:00.341 -> Server: Cowboy
10:24:00.341 -> Connection: close
10:24:00.341 -> Content-Length: 0
10:24:00.341 -> Date: Tue, 28 Dec 2021 09:23:58 GMT
10:24:00.341 -> Via: 1.1 vegur
10:24:00.341 ->
10:24:00.341 -> OK
10:24:00.341 -> Response:
10:24:00.374 ->
10:24:00.374 -> AT+CIPCLOSE=0
10:24:00.374 ->
10:24:00.374 -> 0, CLOSE OK
10:24:00.374 -> Server disconnected
Error AT Commands
10:24:53.596 -> AT+CGNSINF
10:24:53.629 ->
10:24:53.629 -> +CGNSINF: xxxxxxxxxxxxx
10:24:53.629 ->
10:24:53.629 -> OK
10:24:53.629 -> AT+CIPCLOSE=0
10:24:53.629 ->
10:24:53.629 -> ERROR
10:24:53.629 -> AT+CIPSTART=0,"TCP","xxxx.xxxxx.com",80
10:24:53.629 ->
10:24:53.629 -> ERROR
10:24:53.629 -> failed to connect
Hi all. I am doing some tests with an ESP32 Lilygo TTGO SIM7000 and I have warned that there is a problem with HTTP after some time sending data.
When I turn on the ESP32 it works correctly and after about an hour of sending data, the connection fails and it does not connect again.
This is the code. Any suggestion?
#define SerialMon Serial // Set serial for AT commands (to the module)` // Use Hardware Serial on Mega, Leonardo, Micro #define SerialAT Serial1 #define TINY_GSM_MODEM_SIM7000 #define TINY_GSM_RX_BUFFER 1024 // Set RX buffer to 1Kb // See all AT commands, if wanted // #define DUMP_AT_COMMANDS // set GSM PIN, if any #define GSM_PIN "XXXX" // Your GPRS credentials, if any const char apn[] = "datos"; const char gprsUser[] = ""; const char gprsPass[] = ""; const char server[] = "xxxxxxxxxxx.xxx"; const char coords[] = "/coords"; const int port = 80; #include <TinyGsmClient.h> #include <ArduinoHttpClient.h> #include <ArduinoJson.h> #define DUMP_AT_COMMANDS #ifdef DUMP_AT_COMMANDS #include <StreamDebugger.h> StreamDebugger debugger(SerialAT, SerialMon); TinyGsm modem(debugger); #else TinyGsm modem(SerialAT); #endif TinyGsmClient client(modem); HttpClient http(client, server, port); #define uS_TO_S_FACTOR 1000000ULL // Conversion factor for micro seconds to seconds #define TIME_TO_SLEEP 60 // Time ESP32 will go to sleep (in seconds) #define UART_BAUD 115200 #define PIN_DTR 25 #define PIN_TX 27 #define PIN_RX 26 #define PWR_PIN 4 #define SD_MISO 2 #define SD_MOSI 15 #define SD_SCLK 14 #define SD_CS 13 #define LED_PIN 12 void modemPowerOn() { pinMode(PWR_PIN, OUTPUT); digitalWrite(PWR_PIN, LOW); delay(1000); //Datasheet Ton mintues = 1S digitalWrite(PWR_PIN, HIGH); } void modemPowerOff() { pinMode(PWR_PIN, OUTPUT); digitalWrite(PWR_PIN, LOW); delay(1500); //Datasheet Ton mintues = 1.2S digitalWrite(PWR_PIN, HIGH); } void modemRestart() { modemPowerOff(); delay(1000); modemPowerOn(); } void enableGPS(void) { // Set SIM7000G GPIO4 LOW ,turn on GPS power // CMD:AT+SGPIO=0,4,1,1 // Only in version 20200415 is there a function to control GPS power Serial.println("Start positioning . Make sure to locate outdoors."); Serial.println("The blue indicator light flashes to indicate positioning."); modem.sendAT("+SGPIO=0,4,1,1"); if (modem.waitResponse(10000L) != 1) { DBG(" SGPIO=0,4,1,1 false "); } modem.enableGPS(); } void disableGPS(void) { // Set SIM7000G GPIO4 LOW ,turn off GPS power // CMD:AT+SGPIO=0,4,1,0 // Only in version 20200415 is there a function to control GPS power modem.sendAT("+SGPIO=0,4,1,0"); if (modem.waitResponse(10000L) != 1) { DBG(" SGPIO=0,4,1,0 false "); } modem.disableGPS(); } void sendCoords(float lat, float lon) { // Prepare JSON document StaticJsonDocument<200> doc; doc["lat"] = lat; doc["lon"] = lon; // Serialize JSON document String json; serializeJson(doc, json); int err = http.post(coords, "application/json", json); if (err != 0) { SerialMon.println(F("failed to connect")); delay(10000); return; } int status = http.responseStatusCode(); if (!status) { delay(10000); return; } String body = http.responseBody(); SerialMon.println(F("Response:")); SerialMon.println(body); // Shutdown http.stop(); SerialMon.println(F("Server disconnected")); } void setup() { // Set console baud rate SerialMon.begin(115200); delay(10); // Set LED OFF pinMode(LED_PIN, OUTPUT); digitalWrite(LED_PIN, HIGH); SerialAT.begin(UART_BAUD, SERIAL_8N1, PIN_RX, PIN_TX); delay(10000); modemPowerOn(); Serial.println("Initializing modem..."); if (!modem.restart()) { Serial.println("Failed to restart modem, attempting to continue without restarting"); } // String modemInfo = modem.getModemInfo(); // SerialMon.print("Modem Info: "); // SerialMon.println(modemInfo); // Unlock your SIM card with a PIN if needed if (GSM_PIN && modem.getSimStatus() != 3) { modem.simUnlock(GSM_PIN); } } void loop() { // GPRS connection parameters are usually set after network registration SerialMon.print(F("Connecting to ")); SerialMon.print(apn); if (!modem.gprsConnect(apn, gprsUser, gprsPass)) { SerialMon.println(" fail"); delay(10000); return; } SerialMon.println(" success"); if (modem.isGprsConnected()) { SerialMon.println("GPRS connected"); } enableGPS(); float lat, lon; while (1) { if (modem.getGPS(&lat, &lon)) { sendCoords(lat, lon); } digitalWrite(LED_PIN, !digitalRead(LED_PIN)); delay(7500); } }Successful http request AT dump commands.
10:23:58.141 -> 0, CONNECT OK 10:23:58.141 -> AT+CIPSEND=0,4 10:23:58.141 -> 10:23:58.141 -> >POST 10:23:58.141 -> DATA ACCEPT:0,4 10:23:58.141 -> AT+CIPSEND=0,1 10:23:58.141 -> 10:23:58.141 -> DATA ACCEPT:0,1 10:23:58.141 -> AT+CIPSEND=0,7 10:23:58.141 -> 10:23:58.141 -> >/coords 10:23:58.174 -> DATA ACCEPT:0,7 10:23:58.174 -> AT+CIPSEND=0,9 10:23:58.174 -> 10:23:58.174 -> > HTTP/1.1 10:23:58.174 -> DATA ACCEPT:0,9 10:23:58.174 -> AT+CIPSEND=0,2 10:23:58.174 -> 10:23:58.174 -> DATA ACCEPT:0,2 10:23:58.174 -> AT+CIPSEND=0,6 10:23:58.174 -> 10:23:58.174 -> >Host: 10:23:58.174 -> DATA ACCEPT:0,6 10:23:58.174 -> AT+CIPSEND=0,24 10:23:58.174 -> 10:23:58.174 -> >xxx.xxxx.com 10:23:58.174 -> DATA ACCEPT:0,24 10:23:58.174 -> AT+CIPSEND=0,2 10:23:58.174 -> 10:23:58.174 -> DATA ACCEPT:0,2 10:23:58.207 -> AT+CIPSEND=0,10 10:23:58.207 -> 10:23:58.207 -> >User-Agent 10:23:58.207 -> DATA ACCEPT:0,10 10:23:58.207 -> AT+CIPSEND=0,2 10:23:58.207 -> 10:23:58.207 -> DATA ACCEPT:0,2 10:23:58.207 -> AT+CIPSEND=0,13 10:23:58.207 -> 10:23:58.207 -> >Arduino/2.2.0 10:23:58.207 -> DATA ACCEPT:0,13 10:23:58.207 -> AT+CIPSEND=0,2 10:23:58.207 -> 10:23:58.207 -> DATA ACCEPT:0,2 10:23:58.207 -> AT+CIPSEND=0,10 10:23:58.207 -> 10:23:58.207 -> >Connection 10:23:58.207 -> DATA ACCEPT:0,10 10:23:58.207 -> AT+CIPSEND=0,2 10:23:58.207 -> 10:23:58.241 -> DATA ACCEPT:0,2 10:23:58.241 -> AT+CIPSEND=0,5 10:23:58.241 -> 10:23:58.241 -> >close 10:23:58.241 -> DATA ACCEPT:0,5 10:23:58.241 -> AT+CIPSEND=0,2 10:23:58.241 -> 10:23:58.241 -> DATA ACCEPT:0,2 10:23:58.241 -> AT+CIPSEND=0,12 10:23:58.241 -> 10:23:58.241 -> >Content-Type 10:23:58.241 -> DATA ACCEPT:0,12 10:23:58.241 -> AT+CIPSEND=0,2 10:23:58.241 -> 10:23:58.241 -> DATA ACCEPT:0,2 10:23:58.241 -> AT+CIPSEND=0,16 10:23:58.241 -> 10:23:58.241 -> >application/json 10:23:58.241 -> DATA ACCEPT:0,16 10:23:58.241 -> AT+CIPSEND=0,2 10:23:58.274 -> 10:23:58.274 -> DATA ACCEPT:0,2 10:23:58.274 -> AT+CIPSEND=0,14 10:23:58.274 -> 10:23:58.274 -> >Content-Length 10:23:58.274 -> DATA ACCEPT:0,14 10:23:58.274 -> AT+CIPSEND=0,2 10:23:58.274 -> 10:23:58.274 -> DATA ACCEPT:0,2 10:23:58.274 -> AT+CIPSEND=0,2 10:23:58.274 -> 10:23:58.274 -> >31 10:23:58.274 -> DATA ACCEPT:0,2 10:23:58.274 -> AT+CIPSEND=0,2 10:23:58.274 -> 10:23:58.274 -> DATA ACCEPT:0,2 10:23:58.274 -> AT+CIPSEND=0,2 10:23:58.274 -> 10:23:58.307 -> DATA ACCEPT:0,2 10:23:58.307 -> AT+CIPSEND=0,31 10:23:58.307 -> 10:23:58.307 -> >{"lat":XX.XXXXX,"lon":X.XXXXXX} 10:23:58.307 -> DATA ACCEPT:0,31 10:23:58.307 -> AT+CIPRXGET=4,0 10:23:58.307 -> 10:23:58.307 -> +CIPRXGET: 4,0,0 10:23:58.307 -> 10:23:58.307 -> OK 10:23:58.307 -> AT+CIPSTATUS=0 10:23:58.307 -> 10:23:58.307 -> +CIPSTATUS: 0,0,"TCP","XX.XXX.XXX.XX","80","CONNECTED" 10:23:58.307 -> 10:23:58.307 -> OK 10:23:59.308 -> AT+CIPRXGET=4,0 10:23:59.308 -> 10:23:59.308 -> +CIPRXGET: 1,0 10:23:59.308 -> 10:23:59.308 -> +CIPRXGET: 4,0,126 10:23:59.308 -> 10:23:59.308 -> OK 10:23:59.308 -> AT+CIPSTATUS=0 10:23:59.308 -> 10:23:59.308 -> +CIPSTATUS: 0,0,"TCP","XX.XXX.XXX.XX","80","REMOTE CLOSING" 10:23:59.341 -> 10:23:59.341 -> OK 10:24:00.341 -> AT+CIPRXGET=4,0 10:24:00.341 -> 10:24:00.341 -> +CIPRXGET: 4,0,126 10:24:00.341 -> 10:24:00.341 -> OK 10:24:00.341 -> AT+CIPRXGET=2,0,126 10:24:00.341 -> 10:24:00.341 -> +CIPRXGET: 2,0,126,0 10:24:00.341 -> HTTP/1.1 200 OK 10:24:00.341 -> Server: Cowboy 10:24:00.341 -> Connection: close 10:24:00.341 -> Content-Length: 0 10:24:00.341 -> Date: Tue, 28 Dec 2021 09:23:58 GMT 10:24:00.341 -> Via: 1.1 vegur 10:24:00.341 -> 10:24:00.341 -> OK 10:24:00.341 -> Response: 10:24:00.374 -> 10:24:00.374 -> AT+CIPCLOSE=0 10:24:00.374 -> 10:24:00.374 -> 0, CLOSE OK 10:24:00.374 -> Server disconnectedError AT Commands
10:24:53.596 -> AT+CGNSINF 10:24:53.629 -> 10:24:53.629 -> +CGNSINF: xxxxxxxxxxxxx 10:24:53.629 -> 10:24:53.629 -> OK 10:24:53.629 -> AT+CIPCLOSE=0 10:24:53.629 -> 10:24:53.629 -> ERROR 10:24:53.629 -> AT+CIPSTART=0,"TCP","xxxx.xxxxx.com",80 10:24:53.629 -> 10:24:53.629 -> ERROR 10:24:53.629 -> failed to connect
Did you figure out what was wrong ? Maybe your webserver kicking you out due to connection limit or device itself getting our of memory
