I thought about it ... but it just doesn't make much sense, because there are enough apps in the Android Market that do exactly this.
So I will not provide a plug-in or another means of DynDNS integration, but for those of you who would like to experiment here is a basic BeanShell implementation of the DynDNS API:
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.*;
import org.apache.http.client.methods.*;
import org.apache.http.util.*;
import org.apache.http.auth.*;
/*
Host, username and password settings
*/
hostname = "";
user = "";
password = "";
/*
Get IP number
*/
client = new DefaultHttpClient();
getURL = "http://checkip.dyndns.com/";
get = new HttpGet(getURL);
responseGet = client.execute(get);
resEntityGet = responseGet.getEntity();
if (resEntityGet != null) {
// Extract IP number
ip = EntityUtils.toString(resEntityGet).replaceAll(".*?([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}).*", "$1").replaceAll("[\n\r]", "");
print("IP: " + ip);
/*
Send DynDNS update request
*/
updateURL= "https://members.dyndns.org/nic/update?hostname=" + hostname + "&myip=" + ip + "&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG";
get = new HttpGet(updateURL);
client.getCredentialsProvider().setCredentials(new AuthScope(null, -1),
new UsernamePasswordCredentials(user, password));
responseGet = client.execute(get);
resEntityGet = responseGet.getEntity();
response = EntityUtils.toString(resEntityGet);
success = response.startsWith("good");
// Print result
print("Response: " + response);
}
Hostname, username and password have to be inserted into the script.
This implementation is not complete but should be a good start for further development.
To start the script automatically when PAW starts, put it in the paw/autostart or paw/etc/rc.* folder.
The API is quite easy and it should not take too long to get a complete implementation up and running ...

