I am working on data upload to server.
I will use json string with a “PUT” method. The server side is working and tested with GPRS module.
I will make an Ethernet solution with the ENC28 module.
I am trying to upload data, but an Exception´s break the program.
Anyone who has experience with Json in .NETMF or sample code.
I want to receive and transmit a Json string to/from server.
public static void senddata()
{
var webAddr = "http:/****.com/datapoint";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
httpWebRequest.ContentType = "application/json; charset=utf-8";
httpWebRequest.ContentLength = json.Length;
httpWebRequest.Method = "PUT";
Debug.Print("webAddr: " + webAddr +
"\nhttpWebRequest: " + httpWebRequest +
"\nhttpWebRequest.ContentType: " + httpWebRequest.ContentType +
"\nhttpWebRequest.ContentLength: " + httpWebRequest.ContentLength +
"\nhttpWebRequest.Method: " + httpWebRequest.Method + "\n\n");
try
{
Debug.Print("Start: StreamWriter(httpWebRequest.GetRequestStream())");
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream())) //<== BREAK!!!
{
string json = "Json sting with datavalue";
streamWriter.Write(json);
streamWriter.Flush();
Debug.Print("Flush done!!");
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
var result = streamReader.ReadToEnd();
Debug.Print("modtaget er " + result);
}
Debug.Print("Status OK");
}
catch
{
Debug.Print("Error i send data");
}
}
OUTPUT:
IP address is set.
webAddr: http://*** /DataPoint
httpWebRequest: System.Net.HttpWebRequest
httpWebRequest.ContentType: application/json; charset=utf-8
httpWebRequest.ContentLength: 128
httpWebRequest.Method: PUT
Start: StreamWriter(httpWebRequest.GetRequestStream())
#### Exception System.Net.Sockets.SocketException - CLR_E_FAIL (1) ####
#### Message:
#### Microsoft.SPOT.Net.SocketNative::getaddrinfo [IP: 0000] ####
#### System.Net.Dns::GetHostEntry [IP: 0008] ####
#### System.Net.HttpWebRequest::EstablishConnection [IP: 00e1] ####
#### System.Net.HttpWebRequest::SubmitRequest [IP: 0019] ####
#### System.Net.HttpWebRequest::GetRequestStream [IP: 0008] ####
#### CleanEthernet.Program::Main [IP: 0017] ####
#### SocketException ErrorCode = 10060
#### SocketException ErrorCode = 10060
A first chance exception of type ‘System.Net.Sockets.SocketException’ occurred in Microsoft.SPOT.Net.dll
#### SocketException ErrorCode = 10060
#### SocketException ErrorCode = 10060
#### Exception System.Net.WebException - 0x00000000 (1) ####
#### Message: host not available
#### System.Net.HttpWebRequest::EstablishConnection [IP: 00f1] ####
#### System.Net.HttpWebRequest::SubmitRequest [IP: 0019] ####
#### System.Net.HttpWebRequest::GetRequestStream [IP: 0008] ####
#### CleanEthernet.Program::Main [IP: 0017] ####
A first chance exception of type ‘System.Net.WebException’ occurred in System.Http.dll
A first chance exception of type ‘System.Net.WebException’ occurred in System.Http.dll
?