blemasle / arduino-sim808

Straightforward Arduino library for the SIM808

SIM808

This library allows to access some of the features of the SIM808 GPS & GPRS module. It requires only the RESET pin to work and a TTL Serial. STATUS pin can be wired to enhance the module power status detection, while wiring the PWRKEY adds the ability to turn the module on & off.

The library tries to reduces memory consumption as much as possible, but nonetheless use a 64 bytes buffer to communicate with the SIM808 module. When available, SIM808 responses are parsed to ensure that commands are correctly executed by the module. Commands timeouts are also set according to SIMCOM documentation.

No default instance is created when the library is included

Arduino-Log is used to output formatted commands in a printf style. This make implementation of new commands really easy, and avoid successive prints or string concatenation on complex commands.

Features

• Fine control over the module power management
• Sending SMS
• Sending GET and POST HTTP(s) requests
• Acquiring GPS positions, with access to individual fields
• Reading of the device states (battery, gps, network)

Why another library ?

There is a number of libraries out there which support this modem (Adafruit's FONA, TinyGSM for instance), so why build another one ? None fit the needs I had for a project. FONA is more a giant example for testing commands individually and I was getting unreliable results with it. TinyGSM seems great but what it gains in chips support it lacks in fine grained control over each modules, which I needed.

This library is then greatly inspired by FONA, which served as the reference implementation, but mostly only support the features I needed for my project and has been tested thoroughly and successfully in that configuration. It also tries to reduce the final HEX size as this was a real problem for the project it was built for.

It does not have the pretention to become the new SIM808 standard library, but can be useful to others as a source of inspiration or documentation to understand how AT commands works.

Debugging

If you need to debug the communication with the SIM808 module, you can either define _DEBUG to 1, or directly change _SIM808_DEBUG to 1 in SIMComAT.h.

Be aware that it will increase the final hex size as debug strings are stored in flash.

Usage

No default instance is created when the library is included. It's up to you to create one with the appropriate parameters.

#include <SIM808.h>
#include <SoftwareSerial.h>

#define SIM_RST		5	///< SIM808 RESET
#define SIM_RX		6	///< SIM808 RXD
#define SIM_TX		7	///< SIM808 TXD
#define SIM_PWR		9	///< SIM808 PWRKEY
#define SIM_STATUS	8	///< SIM808 STATUS

#define SIM808_BAUDRATE 4800    ///< Control the baudrate use to communicate with the SIM808 module

SoftwareSerial simSerial = SoftwareSerial(SIM_TX, SIM_RX);
SIM808 sim808 = SIM808(SIM_RST, SIM_PWR, SIM_STATUS);
// SIM808 sim808 = SIM808(SIM_RST); // if you only have the RESET pin wired
// SIM808 sim808 = SIM808(SIM_RST, SIM_PWR); // if you only have the RESET and PWRKEY pins wired

void setup() {
   simSerial.begin(SIM808_BAUDRATE);
   sim808.begin(simSerial);

   sim808.powerOnOff(true);    //power on the SIM808. Unavailable without the PWRKEY pin wired
   sim808.init();
}

void loop() {
   // whatever you need to do
}

See examples for further usage.

A note about HTTPS

While technically, SIM808 module support HTTPS requests through the HTTP service, it is particularly unreliable and sketchy. 7 times out of 10, the request won't succeed.
In the future, I hope to find the time to make HTTPS work with the TCP service. In the meantime I strongly (and sadly) recommend to stick with HTTP requests if you need reliability.

arduino-sim808's Issues

ArduinoLog.h is not available for arduino uno while compiling

while compiling arduino giving the following error in console of Arduino..

In file included from C:\Users\USER1\Documents\Arduino\libraries\arduino-sim808-master\src/SIM808.h:3:0,

             from E:\SIM808\SIM808_P1\SIM808_P1.ino:1:

C:\Users\USER1\Documents\Arduino\libraries\arduino-sim808-master\src/SIMComAT.h:4:24: fatal error: ArduinoLog.h: No such file or directory

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

Arduino Uno with SIM808 from DFRobot

Hi Bertrand
I am using your SIM808 library on an an Arduino Uno and a SIM808 GSM GPRS GPS shield from DFRobot.com. I have wired it to fit the way uou use the control ports 5 to 8 and it seems to work. I use the "Test" procedure and the SIM808 is powered up and it seems to find the GSM net (the blue NET LED is blinking every third second), but the program never returns from the Init procedure, as seen in the attached screendump.

I have enabled debug in the SimComAT.h like this #define _SIM808_DEBUG 1 //_DEBUG , but no further messages arrived.
Finally I have connected SIM808 pin 16 RESET to D5 of UNO and shield without any change.
Do you any comments or hints for further investigations?

I could not return a correct result.

My code looks like this :

#include <DFRobot_sim808.h>
#include <SoftwareSerial.h>

#define PIN_TX 10
#define PIN_RX 11
SoftwareSerial mySerial(PIN_TX,PIN_RX);
DFRobot_SIM808 sim808(&mySerial);//Connect RX,TX,PWR,

char http_cmd[] = "GET /media/uploads/mbed_official/hello.txt HTTP/1.0\r\n\r\n";
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(F("cmnet"))) {
    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,"mbed.org", 80)) {
    Serial.println("Connect error");
}else{
    Serial.println("Connect mbed.org 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(){

}

But, "Hello World" does not return the result :

sim808 gps data appending with lat and lon

gpsdata.txt
[gps code.txt](https://github.com/blemasle/arduino-sim808/files/2983559/gps.co
`#include <SoftwareSerial.h>
#include<SPI.h>
#include<RF24.h>
// ce, csn pins
RF24 radio(9, 10);
SoftwareSerial sim808(7,8);
String gpsval;
//char phone_no[] = "xxxxxxx"; // replace with your phone no.
String data[5];
#define DEBUG true
String state,timegps,latitude,longitude;
String syb="@";
char c;
void setup() {
sim808.begin(9600);
Serial.begin(9600);
delay(50);
radio.begin();
radio.setPALevel(RF24_PA_MAX);
radio.setChannel(0x76);
radio.openWritingPipe(0xF0F0F0F0E1LL);
radio.enableDynamicPayloads();
radio.powerUp();
// sim808.print("AT+CSMP=17,167,0,0"); // set this parameter if empty SMS received
// delay(100);
// sim808.print("AT+CMGF=1\r");
// delay(400);

sendData("AT+CGNSPWR=1",1000,DEBUG);
delay(50);
sendData("AT+CGNSSEQ=RMC",1000,DEBUG);
delay(150);

}

void loop() {

sendTabData("AT+CGNSINF",1000,DEBUG);
if (state !=0) {
// Serial.println("State :"+state);
// Serial.println("Time :"+timegps);
Serial.print("Latitude :");
Serial.println(latitude);
Serial.println("Longitude :"+longitude);
gpsval = latitude+syb+longitude;
Serial.println("gpsval :"+gpsval);
// Length (with one extra character for the null terminator)
int str_len = gpsval.length() + 1;

// Prepare the character array (the buffer)
char char_array[str_len];

// Copy it over 
gpsval.toCharArray(char_array, str_len);

// Check the network regularly
// RF24NetworkHeader header(/to node/ other_node);
bool ok = radio.write(&char_array,sizeof(char_array));
if (ok)
Serial.println("ok.");
else
Serial.println("failed.");
// sim808.print("AT+CMGS="");
// sim808.print(phone_no);
// sim808.println(""");
//const char text[] = "Hello World is awesome";
//radio.write(&gpsval, sizeof(gpsval));
// delay(1000);
//delay(300);

// sim808.print("http://maps.google.com/maps?q=loc:");
// sim808.print(latitude);
// sim808.print(",");
// sim808.print (longitude);
// delay(200);
// sim808.println((char)26); // End AT command with a ^Z, ASCII code 26
// delay(200);
// sim808.println();
// delay(100);
// sim808.flush();
latitude.remove(0,10);
longitude.remove(0,10);

} else {
Serial.println("GPS Initialising...");
}
}

void sendTabData(String command , const int timeout , boolean debug){

sim808.println(command);
Serial.println(command);
long int time = millis();
int i = 0;

while((time+timeout) > millis()){
while(sim808.available()){
c = sim808.read();
if (c != ',') {
data[i] +=c;
delay(100);
} else {
i++;
}
if (i == 5) {
delay(100);
goto exitL;
}
}
}exitL:
if (debug) {
state = data[1];
timegps = data[2];
latitude = data[3];
longitude =data[4];
}
}
String sendData (String command , const int timeout ,boolean debug){
String response = "";
sim808.println(command);
long int time = millis();
int i = 0;

while ( (time+timeout ) > millis()){
while (sim808.available()){
char c = sim808.read();
response +=c;
}
}
if (debug) {
Serial.print(response);
}
return response;
}

`

HTTPPost example is not working with vodafone sim

I've just opened the example, changed pins and apn configuration, enabled debug.
This is the output from serial monitor

N: Powering on SIM808...
Init...
Waiting for echo...

-->AT
Waiting for echo...

-->AT
<--�Waiting for echo...

-->AT
<--AT
<--OK
<--
<--RDY

-->ATE0
<--
<--+CFUN: 1
<--
<--+CPIN: READY
<--ATE0
<--OK

-->AT+CGREG?
<--
<--+CGREG: 0,2
<--
<--OK

-->AT+CSQ
<--
<--+CSQ: 0,0
<--
<--OK
N: No network yet...

-->AT+CGREG?
<--
<--Call Ready
<--
<--SMS Ready
<--
<--+CGREG: 0,1
<--
<--OK

-->AT+CSQ
<--
<--+CSQ: 16,0
<--
<--OK
N: Network is ready.
N: Attenuation : -82 dBm, Estimated quality : 16
N: Powering on SIM808's GPRS...

-->AT+CIPSHUT
<--
<--SHUT OK

-->AT+CGATT=1
<--
<--OK

-->AT+CSTT="mobile.vodafone.it","",""
<--
<--OK

-->AT+SAPBR=1,1
<--
<--OK
N: Sending HTTP request...

-->AT+HTTPTERM
<--
<--ERROR

-->AT+HTTPINIT
<--
<--OK

-->AT+HTTPPARA="REDIR","1"
<--
<--OK

-->AT+HTTPPARA="CID","1"
<--
<--OK

-->AT+HTTPPARA="URL","http://httpbin.org/anything"
<--
<--OK

-->AT+HTTPPARA="CONTENT","text/plain"
<--
<--OK

-->AT+HTTPDATA=16,10000
<--
<--DOWNLOAD

-->This is the body<--
<--OK

-->AT+HTTPACTION=1
<--
<--OK
<--
<--+HTTPACTION: 1,601,0

-->AT+HTTPREAD=0,0
<--
<--ERROR
N: Server responsed : 601
N: This is the body

As you can see, in this example i didn't even changed the url, but it's not working with any url. HttpGet give the same error. Apn configuration is ok, my simcard is working and I can use with success http request by using this library. It handles both GPRS Setup and http request with different AT COMMANDS than those you used. For HTTP he is using TCP AT Commands, for GPRS Setup he is using a slightly different AT command flow and parameters (but i'm not an expert). I can't understand if the problem is with HTTP Commands or with GPRS Setup.

Why is the reset pin required?

According to the SIM808 docs, it seems that the reset pin is only for "emergency situations", i.e. when the device is not responding, or is in some kind of terminal error state.

Why is the reset pin required in the SIM808 constructor?

How to use HardwareSerial?

Hi,

i have this board: https://aax-eu.amazon-adsystem.com/x/c/QjB8EozTLRzWPqqyixda-WAAAAFvoFNo6QMAAAH2AbprfyI/https://www.amazon.de/gp/aw/d/B0721T8CDZ?pf_rd_p=5e2a70c8-77de-4865-9918-07306318c381&aaxitk=nVh5HqNk-xS66dwOeNpfGg&hsa_cr_id=6120989910702&ref_=sb_s_sparkle_slot

It's already working with AT commands but I can not get your library work. I have a Mega 2560 and tried:

HardwareSerial *simSerial = &Serial1;
SIM808 sim808 = SIM808(SIM_RST, SIM_PWR, SIM_STATUS);
char position[POSITION_SIZE];

void setup() {
    Serial.begin(SERIAL_BAUDRATE);
    Log.begin(LOG_LEVEL_NOTICE, &Serial);

    simSerial.begin(SIM808_BAUDRATE);
    sim808.begin(simSerial);```

But the error is: 
request for member 'begin' in 'simSerial', which is of pointer type 'HardwareSerial*' (maybe you meant to use '->' ?)

Thanks for help!

Two serial ports

Hi,
I'm using two serial ports, in this library I was looking for the Serial.listen() function or similar, but I can not find it. Please help me, or tell me how I add this function.
Thank you.

bk-808

Hi,
I have that board: LINK
I connected only GND,PWRIN,TR,RX to arduino.
On my serial monitor I have only:
Waiting for echo... -->AT
if I connect sim808 directly to serial port on my laptop, and send "AT" command, the board response "OK".

Please help me :)

Board compatibility. Power, status and reset pins

Is this board compatible with this library? I don't know where should I connect status, reset and power pin.

I modded the library to work only with Serial tx rx pin connections, but it would be nice to have powerOnOff methods and other nice things developed here.
I suppose "RTS" is for reset, but what about power and status pin?

Unsigned Integer Bug

arduino-sim808/src/SIM808.Power.cpp

Lines 29 to 34 in d99de04

	uint16_t timeout = 2000;
	do {
	delay(150);
	timeout -= 150;
	currentlyPowered = powered();
	} while(currentlyPowered != power && timeout > 0);

I think timeout on line 29 should be a 16-bit signed integer. Otherwise the timeout > 0 check on line 34 will always be true since timeout cannot go negative and cannot be 0 (2000 % 15 != 0).

I don't think a single line change warrants a whole pull request, but I can submit one if the author insists. I'm not sure what the Github etiquette is.

How to pass a Authorization Header on sim808.postHttp ?

How to pass an Authorization Header on sim808.postHttp ?

ESP32 error

Hi everyone,
if i use that library with the ESP32 board, i receive this messages over a simple sketch:

#include <SIM808.h>
#include <ArduinoLog.h>

void setup() {
  // put your setup code here, to run once:
}

void loop() {
  // put your main code here, to run repeatedly:
}

In file included from /Users/dave/Documents/Arduino/libraries/SIM808/src/SIM808.h:3:0,
                 from /var/folders/91/_rb11v6d67gb2dd7q5k14td80000gn/T/arduino_modified_sketch_263358/AcquireGPSPosition.ino:5:
/Users/dave/Documents/Arduino/libraries/SIM808/src/SIMComAT.h:77:9: error: extra qualification 'SIMComAT::' on member 'readNext' [-fpermissive]
  size_t SIMComAT::readNext(char * buffer, size_t size, uint16_t * timeout = NULL, char stop = 0);

         ^
In file included from /Users/dave/Library/Arduino15/packages/esp32/hardware/esp32/1.0.1/cores/esp32/esp32-hal.h:53:0,
                 from /Users/dave/Library/Arduino15/packages/esp32/hardware/esp32/1.0.1/cores/esp32/Arduino.h:35,
                 from sketch/AcquireGPSPosition.ino.cpp:1:
/Users/dave/Library/Arduino15/packages/esp32/hardware/esp32/1.0.1/cores/esp32/esp32-hal-gpio.h:51:19: error: expected identifier before numeric constant
 #define DISABLED  0x00
                   ^
/Users/dave/Documents/Arduino/libraries/SIM808/src/SIM808.Types.h:62:2: note: in expansion of macro 'DISABLED'
  DISABLED = 4 ///< Disable phone both transmit and receive RF circuit.

  ^
/Users/dave/Library/Arduino15/packages/esp32/hardware/esp32/1.0.1/cores/esp32/esp32-hal-gpio.h:51:19: error: expected '}' before numeric constant
 #define DISABLED  0x00
                   ^
/Users/dave/Documents/Arduino/libraries/SIM808/src/SIM808.Types.h:62:2: note: in expansion of macro 'DISABLED'
  DISABLED = 4 ///< Disable phone both transmit and receive RF circuit.

  ^
/Users/dave/Library/Arduino15/packages/esp32/hardware/esp32/1.0.1/cores/esp32/esp32-hal-gpio.h:51:19: error: expected unqualified-id before numeric constant
 #define DISABLED  0x00
                   ^
/Users/dave/Documents/Arduino/libraries/SIM808/src/SIM808.Types.h:62:2: note: in expansion of macro 'DISABLED'
  DISABLED = 4 ///< Disable phone both transmit and receive RF circuit.

  ^
In file included from /Users/dave/Documents/Arduino/libraries/SIM808/src/SIM808.h:4:0,
                 from /var/folders/91/_rb11v6d67gb2dd7q5k14td80000gn/T/arduino_modified_sketch_263358/AcquireGPSPosition.ino:5:
/Users/dave/Documents/Arduino/libraries/SIM808/src/SIM808.Types.h:63:1: error: expected declaration before '}' token
 };

 ^
exit status 1
Error compiling for board ESP32 Wrover Module.

setBearerSetting in SIM808.Gprs.cpp return nothing

hi, it's good to see your work, i'm trying to run example of the code "HttpPost" with some editing code.

now i'm facing issue when checking sim808.enableGprs, it's stuck looping with:

N: Powering on SIM808's GPRS...
N: Powering on SIM808's GPRS...
...

after that i #define _DEBUG on the top of the code, but still the result still the same.
so i change directly _SIM808_DEBUG with 1. then it show some more like this:

N: Powering on SIM808's GPRS...

-->AT+CIPSHUT
<--
<--SHUT OK

-->AT+CGATT=1
<--
<--OK

-->AT+SAPBR=0,1
<--
<--ERROR

-->AT+SAPBR=3,1,"CONTYPE","GPRS"
<--
<--OK

-->AT+SAPBR=3,1,"",""
<--
<--ERROR
0
N: Powering on SIM808's GPRS...

the AT+SAPBR=3,1,"CONTYPE","GPRS" is after error AT+SAPBR=3,1,"",""
so i change it just like your bugfix in here. but the rest of SAPBR setting still error. it's just like nothing inserted.

i maybe can change it directly just like what you did with the CONTYPE setting, bbut i think it will be trouble in the future if it not changed in the main code.
could you please trace what happened in here?

well, i'm not really understand with your AT_COMMAND_PARAMETER line either. where the variable BEARER and CONTYPE setting started?

SIM808.init() not returning

SIM808.init() is taking forever to return

Compile Errror

Trying to use this library with the DFRobot SIM808 GSM/GPRS/GPS Arduino IOT Board (combined Leonardo & SIM808 board).

Using Arduino IDE version1.8.9 . Trying to compile the GeneralInformation sketch I get the following errors:

In file included from /home/david/arduino-1.8.9/hardware/tools/avr/avr/include/avr/io.h:144:0,
from /home/david/arduino-1.8.9/hardware/tools/avr/avr/include/avr/pgmspace.h:90,
from /home/david/arduino-1.8.9/hardware/arduino/avr/cores/arduino/Arduino.h:28,
from /tmp/arduino_build_260468/sketch/GeneralInformation.ino.cpp:1:
/home/david/Arduino/libraries/SIM808/src/SIM808.Types.h:80:2: error: expected identifier before numeric constant
SPEED = 6, ///< Speed over ground in km/h.

^
/home/david/Arduino/libraries/SIM808/src/SIM808.Types.h:80:2: error: expected '}' before numeric constant
/home/david/Arduino/libraries/SIM808/src/SIM808.Types.h:80:2: error: expected unqualified-id before numeric constant
In file included from /home/david/Arduino/libraries/SIM808/src/SIM808.h:4:0,
from /home/david/Arduino/libraries/SIM808/examples/GeneralInformation/GeneralInformation.ino:5:
/home/david/Arduino/libraries/SIM808/src/SIM808.Types.h:84:1: error: expected declaration before '}' token
};

^
Using library SIM808 at version 1.1.0 in folder: /home/david/Arduino/libraries/SIM808
Using library ArduinoLog at version 1.0.3 in folder: /home/david/Arduino/libraries/ArduinoLog
Using library SoftwareSerial at version 1.0 in folder: /home/david/arduino-1.8.9/hardware/arduino/avr/libraries/SoftwareSerial
exit status 1
Error compiling for board Arduino Leonardo.

Waiting for RDY is not possible if Auto-Bauding is enabled

arduino-sim808/src/SIM808.cpp

Lines 53 to 54 in a0b3dcd

	// we got AT, waiting for RDY
	while (waitResponse(TO_F(TOKEN_RDY)) != 0);

As per the SIM808 manual:

When power on procedure is completed, SIM808 will send following URC to indicate that the module is ready to operate at fixed baud rate.

RDY

This URC does not appear when autobauding function is active.
Note: User can use AT command “AT+IPR=x” to set a fixed baud rate and save the configuration to non-volatile flash memory. After the configuration is saved as fixed baud rate, the Code “RDY” should be received from the serial port every time when SIM808 is powered on. For details, please refer to the chapter “AT+IPR” in document [1].

Unfortunately in the breakout board I have available, AT+IPR does not preserve its value (likely due to missing flash storage). It may make sense to only use the AT -> OK response for such situations

Hello estou enfrentando alguns problemas no exemplo para pegar a location position

Primeiramente parabens pelo trabalho, sou novo no mundo da programação e do IOT, e estou desenvolvendo um projeto para meu trabalho de conclusao de curso de ensino superior, e foi otmo encontrar esse seu trabalho e agradeço muito por disponibilizar ele gratuitamente.

In file included from /home/josevitor/Downloads/arduino-nightly/hardware/arduino/avr/cores/arduino/Arduino.h:232:0,
from sketch/Blink.ino.cpp:1:
/tmp/arduino_modified_sketch_705200/Blink.ino: In function 'void loop()':
/home/josevitor/Downloads/arduino-nightly/hardware/arduino/avr/cores/arduino/WString.h:38:28: warning: invalid conversion from 'const __FlashStringHelper*' to '__StrPtr {aka __FlashStringHelper*}' [-fpermissive]
#define F(string_literal) (reinterpret_cast<const __FlashStringHelper >(PSTR(string_literal)))
~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/Arduino/libraries/SIM808/src/SIMComAT.Common.h:9:22: note: in expansion of macro 'F'
#define S_F(x) F(x)
^
/tmp/arduino_modified_sketch_705200/Blink.ino:67:48: note: in expansion of macro 'S_F'
if(status == SIM808GpsStatus::Fix) state = S_F("Normal");
^~~
/home/josevitor/Downloads/arduino-nightly/hardware/arduino/avr/cores/arduino/WString.h:38:28: warning: invalid conversion from 'const __FlashStringHelper' to '__StrPtr {aka __FlashStringHelper*}' [-fpermissive]
#define F(string_literal) (reinterpret_cast<const __FlashStringHelper *>(PSTR(string_literal)))
~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/Arduino/libraries/SIM808/src/SIMComAT.Common.h:9:22: note: in expansion of macro 'F'
#define S_F(x) F(x)
^
/tmp/arduino_modified_sketch_705200/Blink.ino:68:18: note: in expansion of macro 'S_F'
else state = S_F("Accurate");
^~~

---

esse erro a cima é o que esta retornando no console da IDE do arduino.

warning: invalid conversion

hi, i am coming from python world to brutal arduino C and have an issue:

/home/ser/Arduino/gps-tracker-with-library/gps-tracker-with-library.ino: In function 'void loop()':
/home/ser/Arduino/gps-tracker-with-library/gps-tracker-with-library.ino:73:46: warning: invalid conversion from 'const __FlashStringHelper*' to '__StrPtr {aka __FlashStringHelper*}' [-fpermissive]
     if(status == SIM808GpsStatus::Fix) state = S_F("Normal");
                                              ^
/home/ser/Arduino/gps-tracker-with-library/gps-tracker-with-library.ino:74:16: warning: invalid conversion from 'const __FlashStringHelper*' to '__StrPtr {aka __FlashStringHelper*}' [-fpermissive]
     else state = S_F("Accurate");
                ^

it's your gps example with arduino 1.8.9 - is it something i should worry about? as i am not getting fix, which i am sure i should have, as i have it with simply accessing console without your library.