ThingSpeak

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Hello to everyone. I will be very gratefull for support and knowledge sharing with AT commands and troubleshooting knowledge with hardware setup and software. Hardware context : Arduino Uno, SIM800F GSM shield , USB connection and power, Rx -Tx GSM connection strapped on Software Serial Concerning SIM card. Inserted on a mobile phone, can send and receive SMS and phone communications. Data plan available. Software context : I'm using Serial monitor to send AT commands and receive answers. Aim : to follow manually the proper AT sequence to send one piece of data to one field of one channel. Code : [code] // Sending AT commands via Serial Monitor interface #include<SoftwareSerial.h> SoftwareSerial mySerial(2,3); // setting up GSM serial communication void setup() { digitalWrite(8, HIGH); // Switching on GSM shield delay(1100); digitalWrite(8,LOW); mySerial.begin(9600); Serial.begin(9600); Serial.println("Type AT command :"); } void loop() { if (mySerial.available()) Serial.write(mySerial.read()); if (Serial.available()) mySerial.write(Serial.read()); } [/code] Setup : AT returns OK, SMS ready, CALL ready AT+CPIN? returns ready As far I understand the proper sequence of AT commands to connect device to thingspeak server and send data should be this : AT // is SIM800F ready ? good return is : OK AT+CGREG? // is SIM800F registered on GPRS provider network ? good return is : +CGREG: 0,1 (edited) AT+CGATT? // is GPRS attached or not ? good return is : +CGATT: 1 AT+CIPSHUT // resets previous IP session if any. good return is : SHUT OK AT+CIPSTATUS // Check if IP stack is intitalized. good return is : STATE: IP INITIAL AT+CIPMUX=0 // Sets single connection mode. good return is : OK AT+CSTT="APN","","" // Starts task. good return is : OK AT+CIPSTATUS // Not needed but for troubleshooting Check IP status. good return is : STATE: IP START AT+CIICR // Brings up wireless connection. good return is : OK and quick flashing led (edited) AT+CIPSTATUS // Not needed but for troubleshooting Check IP status. good return is : STATE: IP GPRSACT (edited) AT+CIFSR // Gets local IP adress. good return is : anything else than "0.0.0.0" AT+CIPSTART="TCP", "api.thingspeak....","80" // Starts connection with TCP protocol, TCP, domain name, port. good return is : CONNECT OK AT+CIPSEND // Data sending request. good return is : > > data string // Sends data to the proper field and channel >#026 // Ctrl+Z input to indicate the end of data AT+CIPSHUT // Shuts down UDP context. good return is : SHUT OK At this time : AT+CGREG? is returning : +CGREG: 1,0 which states : network registration is enabled, device is not registered and searching for operator's network (edited) AT+CGATT? is returning : 0, which states GPRS is detached AT+CIICR is returning +PDP: DEACT, ERROR Question : What may prevent network registration and getting a +CGREG: 0,1 return ? (edited) How can I troubleshoot and assess actual situation ? Thank you for your insights.