AlaskaLinuxUser's Scratchpad

First up on my list of learning about this Botletics LTE shield was how to pull data. Fortunately for me, the LTE demo sketch included a method for downloading something from the internet. It works like this:

// The code below was written by Adafruit and only works on some modules
case ‘w’: {
// read website URL
uint16_t statuscode;
int16_t length;
char url[80];
flushSerial();
Serial.println(F(“URL to read (e.g. dweet.io/get/latest/dweet/for/sim7500test123):”));
Serial.print(F(“http://”)); readline(url, 79);
Serial.println(url);
Serial.println(F(“****”));
if (!fona.HTTP_GET_start(url, &statuscode, (uint16_t *)&length)) {
Serial.println(“Failed!”);
break;
}
while (length > 0) {
while (fona.available()) {
char c = fona.read();

// Serial.write is too slow, we’ll write directly to Serial register!
#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)
loop_until_bit_is_set(UCSR0A, UDRE0); /* Wait until data register empty. */
UDR0 = c;
#else
Serial.write(c);
#endif
length–;
if (! length) break;
}
}
Serial.println(F(“\n****”));
fona.HTTP_GET_end();
break;
}

As the code states, it was originally written by Adafruit, and some portions of this code (the Adafruit Fona library) were updated by Timothy Woo of Botletics) and it allows you to look up a URL and download it. So, I tested Google. It downloaded it like so:

And I copied/pasted it into a text file, and saved it as html, which opened in a browser, like this:

So, that works. Granted, using this method was extremely slow. I am using a serial monitor connection over USB at a 9600 baud rate, which really took a while to catch all of the data. You could literally watch the characters being written on the screen. However, I think the modem is much faster, just my interface to it is not as quick. I’ll have to play with it some more, but it was nice to be able to download a web page at least!

Linux – keep it simple.