I've go this code as of the moment #include SoftwareSerial mySerial(7, 8); String numstr , message , inbox; void setup() { Serial.begin(19200); mySerial.begin(19200); //Default serial port setting for the GPRS modem is 19200bps 8-N-1 mySerial.print("\r"); delay(1000); //Wait for a second while the modem sends an "OK" numstr = "09778562037"; message = "here"; } void sendtext( String numstr , String message ) { mySerial.print("AT+CMGF=1\r"); //Because we want to send the SMS in text mode delay(1000); mySerial.print("AT+CMGS=\"" + numstr +"\"" + "\r"); delay(1000); mySerial.print( message + "\r"); //The text for the message delay(1000); mySerial.write(0x1A); //Equivalent to sending Ctrl+Z } void readtext() { char response[255]; int i=0; mySerial.print("AT+CMGR=1\r"); delay(1000); while(mySerial.available()!=0 && i<255){ response[i] = (char)mySerial.read(); i++; } Serial.print(response); if( strstr( response , "LoooooL" ) ) Serial.print("there"); } void loop() { delay(1000); readtext(); } It can output any command with the OK response but whenever I use it on texts or received SMS this happens Arduino Serial Output [Imgur]

It is your first post and you managed to put your code inside of code tags - well done! Unfortunately that is where the compliments end. You haven't included the serial output that you hinted at, although the code doesn't seem to be writing any anyway. The code you posted doesn't compile; a #include is missing and SoftwareSerial is wrongly capitalised. Have you actually even tested using this code? You are missing a mySerial.begin(...). I'm pretty sure that the AT command is supposed to be terminated with \r\n and not just \r. Restate your problem clearly. Provide the actual code that you have the problem with.

You haven't really explained what you expect to happen. In any case, the random binary data you see towards the end of each output line is due to the fact that you are not null terminating response. This should probably fix that: char response[256]; // ... while (mySerial.available() != 0 && i < (sizeof(response) - 1)) { response[i] = (char)mySerial.read(); i++; } response[i] = '\0'; // null terminate C-string You should also read Robin2's great tutorial on reading serial.

I just need the serial to not output the garbage values then I'll substring the message contents

I have here is my current code #include SoftwareSerial mySerial(7, 8); int power = 9; int val; String numstr , message , inbox; void setup() { Serial.begin(19200); mySerial.begin(19200); //Default serial port setting for the GPRS modem is 19200bps 8-N-1 mySerial.print("\r"); delay(1000); //Wait for a second while the modem sends an "OK" numstr = "09778562037"; message = "here"; readtext(); } void readtext() { char response[255]; int i=0; mySerial.print("AT+CMGF=1\r\n"); //Because we want to send the SMS in text mode delay(1000); mySerial.print("AT+CMGR=1\r\n"); delay(1000); while(mySerial.available()!=0 && i 0 ) { Serial.flush(); mySerial.flush(); } } response[255] = '\0'; Serial.print( i ); Serial.print(response); void loop() { } the problem is whenever I do the usual AT commands for the readtext function I get the result I need but whenever I make the arduino do it I end up with this [image] PS. posted at the wrong one apologies [readtext.png]

if ( i % 31 == 0 && i > 0 ) { Serial.flush(); mySerial.flush(); } Why are you flushing the output buffers ? while (mySerial.available() != 0 && i < 255)Do you always get 255 chars returned ?

k5nn: PS. posted at the wrong one apologies What does that mean? Are you still looking for help? Maybe have a look at the examples in Serial Input Basics - simple reliable ways to receive data. The only limit to the number of characters is how much SRAM you have available. ...R

Robin2: Are you still looking for help? I was supposed to post this at programming questions cause well the nature of the question is programming related

UKHeliBob: if ( i % 31 == 0 && i > 0 ) { Serial.flush(); mySerial.flush(); } Why are you flushing the output buffers ? while (mySerial.available() != 0 && i < 255) Do you always get 255 chars returned ? 1 ) I thought that if I flushed the buffers I could make room for the next batch of characters 2 ) I don't get 255 characters returned I only get 64 I read that the serial limits at most 64...

SIM800 AT Commands output parsing

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arduarn November 25, 2017, 3:01pm 4

The OP's image:

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SIM800 AT Commands output parsing

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