Hello! I use sim900 modules and ethernet shield to send sms to my server. I use code like: IPAddress server(111,111,111,111); int send_sms_status = 2; EthernetClient client; void setup() { Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect. Needed for Leonardo …

ethernet shield + gsm/gprs sim900 modules

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