This answer is late, but hopefully it helps others. I have had the same experience of not being able to connect. Rebooting phone and PC does not help. I found the fix at: http://developer.android.com/tools/help/adb.html at the bottom of the page. Basically you follow these steps: Connect phone with usb cable to PC. Issue command: adb … Read more
TCP almost always uses SOCK_STREAM and UDP uses SOCK_DGRAM. TCP (SOCK_STREAM) is a connection-based protocol. The connection is established and the two parties have a conversation until the connection is terminated by one of the parties or by a network error. UDP (SOCK_DGRAM) is a datagram-based protocol. You send one datagram and get one reply … Read more
In TCP there is only one way to detect an orderly disconnect, and that is by getting zero as a return value from read()/recv()/recvXXX() when reading. There is also only one reliable way to detect a broken connection: by writing to it. After enough writes to a broken connection, TCP will have done enough retries … Read more
Here on Stackoverflow are several topics about P2P connections in browsers: Will HTML5 allow web apps to make peer-to-peer HTTP connections? What techniques are available to do P2P in the browser? Does HTML5 Support Peer-to-Peer (and not just WebSockets) Can HTML5 Websockets connect 2 clients (browsers) directly without using a server (P2P) Is it possible … Read more
I have been using Sockets often, mostly with Selectors, and though not a Network OSI expert, from my understanding, calling shutdownOutput() on a Socket actually sends something on the network (FIN) that wakes up my Selector on the other side (same behaviour in C language). Here you have detection: actually detecting a read operation that … Read more
As to part 1, super general overview: Flow control is controlled by the receiving side. It ensures that the sender only sends what the receiver can handle. Think of a situation where someone with a fast fiber connection might be sending to someone on dialup or something similar. The sender would have the ability to … Read more
RFC1700 stated it must be so. (and defined network byte order as big-endian). The convention in the documentation of Internet Protocols is to express numbers in decimal and to picture data in “big-endian” order [COHEN]. That is, fields are described left to right, with the most significant octet on the left and the least significant … Read more
There are tcpdump filters for HTTP GET & HTTP POST (or for both plus message body): Run man tcpdump | less -Ip examples to see some examples Here’s a tcpdump filter for HTTP GET (GET = 0x47, 0x45, 0x54, 0x20): sudo tcpdump -s 0 -A ‘tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420’ Here’s a tcpdump … Read more
It can use either. By default, preference is given to UDP, but depending on the firewall(s) in between the peers connecting it may only be able to connect with TCP. You can use Wireshark to capture packets and verify whether TCP or UDP is being used. In Chrome you can also see details on the … Read more
Does a TCP socket connection have a “keep alive”? The short answer is yes there is a timeout enforced via TCP Keep-Alive, so no the socket won’t remain open forever but will probably time out after a few hours. If you would like to configure the Keep-Alive timeout on your machine, see the “Changing TCP … Read more