So I couldn’t find a solution.
I have an arduino mega using a sim800l to connect to blynk.
I control the sim800l power with a mosfet, so i can turn it off to save power.
I want to be able to continue with the code even if the sim800 can’t connect to the network.
Thanks!
http://docs.blynk.cc/#blynk-firmware-configuration-blynkconfig
http://docs.blynk.cc/#blynk-firmware-connection-management
https://community.blynk.cc/search?q=run%20Blynk%20without%20internet
The problem with GSM connection is that the code in library forces reboot on MCU if it cannot init the modem. In such a case it is not that straightforward to continue without connection. In case of proper modem initialisation but interrupted GPRS communication it is much easier to handle. I can post my solution to review, if needed.
Please do, I would appreciate it!
What i need is to understand if it could connect to the network, ex: if i’m in a location where i don’t have any signal. and if not, to continue with the code and try later.
Tried using config(), managed to connect but if i don’t have any gprs connection, it just reboots. There is no confirmation of a connect or a disconnect. The code just stops there, and I want it to continue instead.
Exactly the way it is. And currently I did nothing with that. You can modify a library to not trigger reboot, but in my case it is the correct behaviour. What I did, is a periodic GPRS connection check and reconnect attempt. But currently I’m on the mobile only and have not access to the computer.
Since I use this circuit on a battery, in case it doesn’t connect, i want it to turn off GSM and go to sleep for a while and try again later. If it keeps rebooting it continues to drain battery. Could you point me to where in the library i can change it? or share your solution when possible ofc.
Thank you!
https://community.blynk.cc/search?expanded=true&q=GSM%20%40marvin7%20order%3Alatest
I know nothing on this GSM issue… but I recommend searching…
Here is the way I handle the connection:
(irrelevant parts stripped)
#define TINY_GSM_MODEM_SIM800
CustomConsole lcdConsole;
#define BLYNK_PRINT lcdConsole
#define SerialAT Serial1
#include <TinyGsmClient.h>
#include <BlynkSimpleSIM800.h>
TinyGsm modem(SerialAT);
BlynkTimer timer;
void GPRScheck() {
if (!modem.isGprsConnected()) {
modem.restart();
modem.simUnlock("1111");
Blynk.config(modem, auth, server);
if (Blynk.connectNetwork(apn, user, pass)) {
lcd.setCursor(1, 0);
lcd.print(F(" "));
lcd.setCursor(1, 0);
lcd.print(modem.getLocalIP());
String COP = modem.getOperator();
COP.remove(15);
lcd.setCursor(18, 0);
lcd.print(COP);
Blynk.connect();
}
}
int csq = modem.getSignalQuality();
char _buff[3];
if (csq != 99) {
csq = map(csq, 0, 31, 0, 99);
sprintf(_buff, "%2d", csq);
}
else {
strcpy(_buff, "--");
}
lcd.setCursor(37, 0);
lcd.print(_buff);
}
void setup()
{
//...
Serial.begin(9600);
//trigger GSM modem POWER pin
pinMode(20, OUTPUT);
digitalWrite(20, HIGH);
delay(1250);
digitalWrite(20, LOW);
pinMode (LED_BUILTIN, OUTPUT);
SerialAT.begin(115200);
delay(3000);
//...
GPRScheck(); //check and initialize GPRS/Blynk connection
//help();
timer.setInterval (60000L, GPRScheck);
}
void loop()
{
Blynk.run();
timer.run();
}
As it comes to library mod, I traced the BLYNK_FATAL definition located in BlynkDebug.h.:
#define BLYNK_FATAL(msg) { BLYNK_LOG1(msg); BlynkFatal(); }
Where BlynkFatal() part causes the delayed (10sec) reboot
BLYNK_FATAL is called each time an unrecoverable (?) error occurs. In BlynkGsmClient.h file you will find it (among others) in bool connectNetwork() in line #43
SO, perhaps simple changing the BLYNK_FATAL to BLYNK_LOG1 in places, where you want to continue instead of reboot will help. BUT this solution is untested by me