Sockets with iOS, Android, simulator

Solar2D General Questions/Discussion
#1

Hello,

I’m facing a strange problem… my program establishes a socket (UDP) comm with a server. It works quite nicely, except in Android + Wifi (Android + 3g, 4g works ok).

So it works in the simulator, with an iPad (wifi only, no 3G), and mobile data android, but not in (I tested a couple of different phones) android + wifi.

I’m using lua sockets, and have android.permission.INTERNET in my build.settings (and properly reflected in the phone app settings).

Any ideas? This is a problem I was not expecting at all…

Thanks,

jaime

#2

Any error messages that can help trouble shoot this?

Rob

#3

Hi Rob,

just tested that - socket:sendto(…) is returning nil, message “hostname nor servname provided, or not known”

Quite misleading, as both hostname and port are verified - and as said, same code works in the simulator and iOS…

Still trying to find out…

Thanks,

jaime

#4

Ok, found something. It is related to biding (or failing to do so) the UDP socket.

I’ll work out the cases - maybe it is just more restricting in Android?

Best regards,

jaime

#5

Ok, so the only way I’ve found it working in all 3 (iOS iPad, several Android, simulator) is using:

socket:setsockname( “specific IP”, “specific port” )

…

socket:sendto( “whatever”, “IP”, “port” )

Just “send” won’t work (not even after the setsockname)

And setsockname with “*” as the address field won’t work either (Android, works in iOS and simulator).

Seems a bit weird to me, but it works now so I’m happy.

Best regards,

jaime

#6

Any error messages that can help trouble shoot this?

Rob

#7

Hi Rob,

just tested that - socket:sendto(…) is returning nil, message “hostname nor servname provided, or not known”

Quite misleading, as both hostname and port are verified - and as said, same code works in the simulator and iOS…

Still trying to find out…

Thanks,

jaime

#8

Ok, found something. It is related to biding (or failing to do so) the UDP socket.

I’ll work out the cases - maybe it is just more restricting in Android?

Best regards,

jaime

#9

Ok, so the only way I’ve found it working in all 3 (iOS iPad, several Android, simulator) is using:

socket:setsockname( “specific IP”, “specific port” )

…

socket:sendto( “whatever”, “IP”, “port” )

Just “send” won’t work (not even after the setsockname)

And setsockname with “*” as the address field won’t work either (Android, works in iOS and simulator).

Seems a bit weird to me, but it works now so I’m happy.

Best regards,

jaime