Every mobile operator implements their systems differently. As far as I know, T-Mobile no longer supports public IP's of devices on their data plans. For sure, they disable multicast on consumer networks because that is a big security whole. So in short (assuming my info is up-to-date), you can't do direct communication.
To get around this, you can setup a relay/rendezvous (R1). So PeerA and PeerB know about R1 and contact it sending messages. PeerA sends message X to R1. When PeerB polls R1, R1 relays PeerA's message to PeerB. Some operator implementations of WAP Push work in a very similar way, as well. JXTA (http://jxta.org) is an open-source framework that handles a lot of this type of stuff. For IM specific messaging, there is Jabber ( http://jabber.org). On Thu, Jul 1, 2010 at 8:44 AM, WuffIT Tech <wuffi...@gmail.com> wrote: > I understand that the IP is subject to change but that is not my > concern. If a connection is dropped, I can always send the other > phone my IP address and reconnect. I have come to the conclusion that > there is not a way to do this without actually using a third party > server. My question now is how should I implement this server. Any > good server examples out there that is similar to what I need? My > overall objective is to have a server that will route a message from > one phone to another like an IM program. > > On Jun 15, 5:47 am, Matthew Powers <mtpow...@gmail.com> wrote: > > I would worry about your IP address changing as you move in and out of > > different networks, your IP address is not constant > > > > On Thu, Jun 10, 2010 at 2:40 PM, WuffIT Tech <wuffi...@gmail.com> wrote: > > > Hi, > > > > > I am new to this forum and I would like to throw out this question and > > > hopefully someone can point me in the right direction. I am developing > > > an Android application and I would like to setup a tcp/ip type of > > > connection between two Android phones using the 3G/Edge network. My > > > test version will establish a connection if I have both phones on a > > > lan using wifi but when I use T-Mobile's network a connection is not > > > established. Could this issue be a port or ip address? Thanks in > > > advance. > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "Android Developers" group. > > > To post to this group, send email to > android-developers@googlegroups.com > > > To unsubscribe from this group, send email to > > > android-developers+unsubscr...@googlegroups.com<android-developers%2bunsubscr...@googlegroups.com> > <android-developers%2bunsubscr...@googlegroups.com<android-developers%252bunsubscr...@googlegroups.com> > > > > > For more options, visit this group at > > >http://groups.google.com/group/android-developers?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com<android-developers%2bunsubscr...@googlegroups.com> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- Shane Isbell (Founder of ZappMarket) http://apps.facebook.com/zappmarket/ -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
