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Pocket PC Forum / Developers / Platform Builder / October 2008Socket Communication over Active Sync
Hi I try to communicate from the Desktop to a Windows CE Device by using Sockets over Active Sync. When i have a Socket-Server on the Windows Desktop (listening on a IP address of a Network card, lets say 192.168.0.111), I can connect a Socket-Client running on the Windows CE device to this Server. But when I try to do the same vice versa It doesn't work. Is this possible at all? yeah I think It should work ...Can U give some more inputs ...then I can able to tell some thing. Ranjit e-consystems.com > Hi > [quoted text clipped - 6 lines] > But when I try to do the same vice versa It doesn't work. Is this > possible at all? I created a TCP/IP socket - server on the device that listens at a certain port, and a Client on the Desktop that tries to connect to the IP address that is assigned when the device is connected to the PC by USB (got the IP by using the IPCONFIG cmd call on the CE device). I can't even ping the windows CE device from the desktop. Ping shouldn't work. ActiveSync doesn't pass though ICMP - it's not a full network connection.  SignatureChris Tacke, Embedded MVP OpenNETCF Consulting Giving back to the embedded community http://community.OpenNETCF.com >I created a TCP/IP socket - server on the device that listens at a > certain port, and a Client on the Desktop that tries to connect to the > IP address that is assigned when the device is connected to the PC by > USB (got the IP by using the IPCONFIG cmd call on the CE device). > > I can't even ping the windows CE device from the desktop. You made really sure that you're being as open to accepting connections as possible? You didn't bind, for example, the socket to a particular IP on the device, did you? You were careful to put things that need to be in network byte order in the right order? htons() on the port number, for example? What error did the PC side get? Paul T. >I created a TCP/IP socket - server on the device that listens at a > certain port, and a Client on the Desktop that tries to connect to the > IP address that is assigned when the device is connected to the PC by > USB (got the IP by using the IPCONFIG cmd call on the CE device). > > I can't even ping the windows CE device from the desktop. Thanks for the help. I do not bind to a particular IP Address (socketAddr.sin_addr.s_addr = INADDR_ANY), but I listen to a certain Port (socketAddr.sin_port = htons(1999). The client on the PC just simply cannot connect to the server on the device (Error = WSAETIMEDOUT). When i do the same with RNDIS connection it works fine. > I do not bind to a particular IP Address (socketAddr.sin_addr.s_addr = > INADDR_ANY), but I listen to a certain Port (socketAddr.sin_port = > htons(1999). > The client on the PC just simply cannot connect to the server on the > device (Error = WSAETIMEDOUT). Give us the details of the device, OS, version, ActiveSync, etc., but, generally, I see what you're seeing when using AS4.2 and serial communications with my CE device. The ActiveSync 'network' connection must be either entirely preventing outgoing connections or at least preventing connections to random TCP ports. > When i do the same with RNDIS connection it works fine. You lost me with this statement. Ethernet connections work, of course... Paul T. I use AS version 4.5 together with a ARM Windows Embedded CE 6.0 (QFE until April 08) BSP. Due to some researched i think that the DTPT sevice which is running on the Windows XP by default is responsible that it works in one direction (Server on the PC, client on the Device) and the missing DTPT services on the Windows CE device could be a reason why it is not working vice versa. So, you've got what you need? Paul T. >I use AS version 4.5 together with a ARM Windows Embedded CE 6.0 (QFE > until April 08) BSP. [quoted text clipped - 4 lines] > DTPT services on the Windows CE device could be a reason why it is not > working vice versa. no, i do need the scenario where i can run a "server" on the windows ce device (by using Active Sync) You can't do it, based on our research. If the network stack doesn't route the packets because "ActiveSync" doesn't act like a real network adapter, you can't somehow force it to work. Take a look at the results of 'ipconfig /all' on the PC when the device is connected with ActiveSync. I think you'll see nothing related to ActiveSync. If that's the case, what's going on in the other direction is that ActiveSync is getting something via serial (custom format), and is deciding how to make that appear on the PC's network. That is, there's no network there to use in the other direction. Think about how you could do this either using RAPI to tell the device to do things or making the PC the server and the Windows CE device the client. Again, you've told us *how* you're planning to fix the problem, *not* what the actual problem is. It's the equivalent of saying, "I have to replace the pistons in my car. How do I do that?", rather than saying, "I have an unusual noise from the engine compartment when X, Y, Z, but not when A. What should I do?" You might get a perfectly reasonable answer to the first question, but if the pistons aren't the problem, you've wasted everyone's time and money. The second question directs the discussion to the *actual problem*, absent your own assumptions about the right thing to do and will usually get a better response. Paul T. > no, i do need the scenario where i can run a "server" on the windows > ce device (by using Active Sync) alright, thanks for the patience. here is the scenario: i need to run a web service on the windows ce 6.0 device, as well as the data synchronisation over Active Sync is a requirement. Since only one USB service can run at the same time I need to decide on either Active Sync or RNDIS profile (with wich the problem of the Server could be solved, as you mentioned right, but not the Data Sync). This device is headless so there is no chance of a user interaction to select the needed mode. Another post on this newsgroup of me, discuss the topic Active Sync over RNDIS which would solve my problem. But as I see there is no way to establish an Active Sync connection over RNDIS in Windows Embedded CE 6.0. What are you syncing to the device over ActiveSync? Files? You could write your own sync stuff for something as simple as that and do everything without the serial connection. I can't imagine that you're syncing calendar items, contacts, favorites, or notes, or are you? It seems likely that doing the sync yourself over the network is going to be more-reasonable than trying to make ActiveSync be a real network connection, at least. Paul T. > alright, thanks for the patience. > [quoted text clipped - 11 lines] > to establish an Active Sync connection over RNDIS in Windows Embedded > CE 6.0. Paul, thanks for the reply. You are right, I do not need to sync calendar entries and stuff like that. Its pure data exchange only. Therefore I could write an own Exchange client which is based on RNDIS. Two reasons why i do not like to go for it: 1. The user is alredy used and familiar with Active Sync 2. There exist already some desktop Applications which use RAPI Well, you're going to have to choose. Web services on the device or ActiveSync? Paul T. > Paul, thanks for the reply. > [quoted text clipped - 5 lines] > 1. The user is alredy used and familiar with Active Sync > 2. There exist already some desktop Applications which use RAPI |
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