heinb on Need help posting data using RN171 wifi shield and wifly library

 Hi there

I am completely stuck and would really like some input.  I can get a stable connection to Thingspeak, but all my attempts to post data re unsuccessful.  I can either post an empty entry (It shows I have a new entry, with null values for the fields) or I can get a 400 Bad Request returned, but that's it.  Any pointers will be welcome!

I am using Wifly.h and connects successfully to the wifi and external sites.

Here is the code for the Bad Request:

I call this function in my main loop:

ThingSpeakUpdate("field1="+String(x)+"&field2="+String(y));

And here is the function:

void ThingSpeakUpdate(String tsData)
{
Serial.println("Data string: " + tsData);

Serial.println("...Connecting to Thingspeak");

// Connecting and sending data to Thingspeak

if(Wifly.connect("api.thingspeak.com","80"))
{
Serial.println("...Connection succesful, updating datastreams");

Wifly.println("POST /update HTTP/1.1");
Wifly.println("Host: api.thingspeak.com");
Wifly.println("Connection: close");
Wifly.println("X-THINGSPEAKAPIKEY: "+myWriteAPIKey);
Wifly.println("Content-Type: application/x-www-form-urlencoded");
Wifly.println("Content-Length: ");
Wifly.println(tsData.length());
Wifly.println();
Wifly.println(tsData);
delay(200);
Serial.println("Thingspeak update sent.");
}
else{
// Failed to connect to Thingspeak
Serial.println("Unable to connect to Thingspeak.");
}