D davemorris Active Member Licensed User Longtime User Jan 14, 2024 #1 Hi, Guys I have a problem with getting the UDP send/receive to work when implementing the example given in the Network documentation for UDPsocket. see https://www.b4x.com/android/help/network.html#udpsocket I put the example into a simple project (attached) but when I run it on my phone the UPD_PacketArrived() event does not trigger (its associated msgbox is not shown and does not hit the breakpoint in debug). I have tried installing the software on multiple phones but none appear to work. Background: I have an App which uses standard server/client LAN operation and communicates successfully using TCP (for reliability). However, the user must enter the server IP address into the client before the App can start to communicate. I would like to make this process automatic. So if the Server end sends its IP address periodically using UDP, then hopefully the client will pick it up and switch to TCP to start the communications process. Assuming however it is possible for a device to transmit its IP address using UDP which can be received by all listening devices, if not, its back to the drawing board! Any input would be appreciated. Kind regards Dave Attachments UDP_Test.zip UDP_Test.zip 9.2 KB · Views: 560
Hi, Guys I have a problem with getting the UDP send/receive to work when implementing the example given in the Network documentation for UDPsocket. see https://www.b4x.com/android/help/network.html#udpsocket I put the example into a simple project (attached) but when I run it on my phone the UPD_PacketArrived() event does not trigger (its associated msgbox is not shown and does not hit the breakpoint in debug). I have tried installing the software on multiple phones but none appear to work. Background: I have an App which uses standard server/client LAN operation and communicates successfully using TCP (for reliability). However, the user must enter the server IP address into the client before the App can start to communicate. I would like to make this process automatic. So if the Server end sends its IP address periodically using UDP, then hopefully the client will pick it up and switch to TCP to start the communications process. Assuming however it is possible for a device to transmit its IP address using UDP which can be received by all listening devices, if not, its back to the drawing board! Any input would be appreciated. Kind regards Dave
Solution drgottjr Jan 14, 2024 try it this way. also, make sure about your device's ip address. 10.0.0.1 sounds like it would be your router, not a simple android device. i used my device's local address.
try it this way. also, make sure about your device's ip address. 10.0.0.1 sounds like it would be your router, not a simple android device. i used my device's local address.
drgottjr Expert Licensed User Longtime User Jan 14, 2024 #2 try it this way. also, make sure about your device's ip address. 10.0.0.1 sounds like it would be your router, not a simple android device. i used my device's local address. Attachments udp.png 44.4 KB · Views: 750 udp_test2.zip udp_test2.zip 9.3 KB · Views: 521 Last edited: Jan 15, 2024 Upvote 0 Solution
try it this way. also, make sure about your device's ip address. 10.0.0.1 sounds like it would be your router, not a simple android device. i used my device's local address.
A adelineana New Member Jan 16, 2024 #3 Hi Dave, Ensure your firewall allows UDP traffic on the specified port. Double-check the code for any errors. Try a different port. Verify that the phones are on the same network. Consider using a broadcast address. If issues persist, consult the community forums for further assistance. Upvote 0
Hi Dave, Ensure your firewall allows UDP traffic on the specified port. Double-check the code for any errors. Try a different port. Verify that the phones are on the same network. Consider using a broadcast address. If issues persist, consult the community forums for further assistance.
D davemorris Active Member Licensed User Longtime User Jan 16, 2024 #4 drgottjr said: try it this way. also, make sure about your device's ip address. 10.0.0.1 sounds like it would be your router, not a simple android device. i used my device's local address. Click to expand... The attached example in post #2 works and has been marked as the solution: Just a quick note: I changed the embedded address (from 10.0.0.1) to my networks's broadcast address (in my case 192.168.0.255) compiled the code and installed the release version onto 3 phones. They worked as expected except one phone only received a few messages. I changed the ports from 5000 and 5001 to 50000 and 50001 respectively and reinstalled and they all worked reliably - I do believe ports below 49153 tend to be reserved, perhaps there was a contention issue with 5000 and 5001 for one of my phones. Anyway thanks for the input - I do believe someone needs to update the sample code in the document reference in post #1 as I believe it is misleading. Regards Dave Last edited: Jan 18, 2024 Upvote 0
drgottjr said: try it this way. also, make sure about your device's ip address. 10.0.0.1 sounds like it would be your router, not a simple android device. i used my device's local address. Click to expand... The attached example in post #2 works and has been marked as the solution: Just a quick note: I changed the embedded address (from 10.0.0.1) to my networks's broadcast address (in my case 192.168.0.255) compiled the code and installed the release version onto 3 phones. They worked as expected except one phone only received a few messages. I changed the ports from 5000 and 5001 to 50000 and 50001 respectively and reinstalled and they all worked reliably - I do believe ports below 49153 tend to be reserved, perhaps there was a contention issue with 5000 and 5001 for one of my phones. Anyway thanks for the input - I do believe someone needs to update the sample code in the document reference in post #1 as I believe it is misleading. Regards Dave
