Udp receiver doesn't see packets from other phones?? #1
Description
Hi,
This is not a bug report, but rather a question. First of all, congratulations
on an excellent project. Your code is very nice and has been very helpful
effort to implement adhoc networking in our project (see
http://code.google.com/p/posit-mobile/). I have also recommended your project
as a model to some of my students.
I've downloaded and adapted your Udp Code to use with our own protocol.
Everything works fine when I implement it in infrastructure mode -- i.e., using
a Wifi hotspot as the broadcast node. But in adhoc mode I'm having trouble
getting the packets to be received by the Udp receiver. Here's how I set up
each phone, with X being a unique hash code between 0 and 254. I'm doing this
on G1 phones.
# insmod /system/lib/modules/wlan.ko
# wlan_loader -f /system/etc/wifi/Fw1251r1c.bin -e /proc/calibration -i
/data/local/bin/tiwlan.ini
# ifconfig rmnet0 192.168.2.X netmask 255.255.255.0
# ifconfig rmnet0 up
And in my tiwlan.ini I have the phone set to Adhoc mode:
WiFiAdhoc = 1
dot11DesiredChannel = 6
dot11DesiredSSID = hfossadhoc
dot11DesiredBSSType = 0
And here's how I create and broadcast packets:
IPAddress = InetAddress.getByName("192.168.2.255"); // Broadcast address
DatagramPacket packet = new DatagramPacket(bytes, bytes.length, IPAddress,
8889);
datagramSocket = new DatagramSocket(8881);
datagramSocket.send(packet);
The Upd receiver socket listens on port 8889. What happens is that the phone
that sent the packet does receive it. But other phones either don't receive it
at all or silently reject the packets. Can you think of any reason why this
would be? Hardware differences? Firewall?
I couldn't find your email or I would have contacted you that way.
Once again, congratulations on a nice thesis result!
Regards,
-- ralph ([email protected])
Original issue reported on code.google.com by [email protected] on 25 Oct 2010 at 8:53