CSDK get xml param from remote service

Hello,

I implemented a remote service on c sdk. the service have a xml parameter

service(XML param) 

when i run the service from edge, i use twInfoTable_GetString function.:

enum msgCodeEnum implementedService(const char* entityName, const char* serviceName, twInfoTable* params, twInfoTable** content, void* userdata) {
 char* param;
 int res;
 TW_LOG(TW_TRACE, "implementedService- Function called");
 if (!content) {
 TW_LOG(TW_ERROR, "implementedService- NULL params or content pointer");
 return TWX_BAD_REQUEST;
 }

 /* Get properties read into local variables */
 twInfoTable_GetString(params, "param", 0, &param);
.........
...........
}

It worked until I put as parameter a long xml text (5000 characters).

The twInfoTable_GetString  truncate the text and i cannot have the whole parameter.

Do you have any idea how to get the whole param even when t's too long ?

Thank you for your help