A Quinta Essência com José Manuel Afonso, Astrofísico, em Maio 2013 na Antena 1
Parte 1 - 11 Maio 2013:
Parte 2 - 18 Maio 2013:
Parte 3 - 25 Maio 2013:
Wednesday, April 23, 2014
Game servers: UDP vs TCP by Christoffer Lernö
Game servers: UDP vs TCP by Christoffer Lernö, an article by Christoffer Lernö can be found at http://1024monkeys.wordpress.com/2014/04/01/game-servers-udp-vs-tcp/Why UDP is “hard”
Topics:
- Background
- What TCP means in practice
- Why UDP is “hard”
- The flawed case for TCP
- When TCP doesn’t work
- Myth: Reliable UDP is TCP implemented poorly
- The bottom line:
So UDP or TCP?
Use HTTP/HTTPS over TCP if you are making occasional, client-initiated stateless queries and an occasional delay is ok.
Use persistent plain TCP sockets if both client and server independently send packets but an occasional delay is ok (e.g. Online Poker, many MMOs).
Use UDP if both client and server may independently send packets and occasional lag is not ok (e.g. Most multiplayer action games, some MMOs)
These are mixable too: Your MMO client might first use HTTP to get the latest updates, then connect to the game servers using UDP.
Never be afraid of using the best tool for a task.
Topics:
- Background
- What TCP means in practice
- Why UDP is “hard”
- The flawed case for TCP
- When TCP doesn’t work
- Myth: Reliable UDP is TCP implemented poorly
- The bottom line:
So UDP or TCP?
Use HTTP/HTTPS over TCP if you are making occasional, client-initiated stateless queries and an occasional delay is ok.
Use persistent plain TCP sockets if both client and server independently send packets but an occasional delay is ok (e.g. Online Poker, many MMOs).
Use UDP if both client and server may independently send packets and occasional lag is not ok (e.g. Most multiplayer action games, some MMOs)
These are mixable too: Your MMO client might first use HTTP to get the latest updates, then connect to the game servers using UDP.
Never be afraid of using the best tool for a task.
Monday, April 14, 2014
ELM 327 Bluetooth v1.5 OBD2 Interface Scanner (Blue/Orange) Original CD
Today I received my ELM 327 Bluetooth v1.5 OBD2 Car Interface Scanner (with a blue/orange label) from Hong Kong.
The label is the same as the one in the picture above. The package contains the interface and a software CD. The software in this CD is a total crap!
CD contents:
Bluesoleil_3.2_VoIP_Multilingual_070406
scantool_net113win
User manual.doc
I tested the OBD interface on a 2007 gasoline car with the software listed below, on a laptop with Windows 7. Only a few worked with this interface, but those worked very well.
The label is the same as the one in the picture above. The package contains the interface and a software CD. The software in this CD is a total crap!
CD contents:
Bluesoleil_3.2_VoIP_Multilingual_070406
scantool_net113win
User manual.doc
Neither of these programs worked with the interface. The interface paired correctly when using windows bluetooth but it did not paired with Bluesoleil, it did not recognized the interface. Scantool_net113win is a 16bit color application! More chinese crap!
A link to the original CD contents packed in a zip file is available here: (46.6 MB)
I tested the OBD interface on a 2007 gasoline car with the software listed below, on a laptop with Windows 7. Only a few worked with this interface, but those worked very well.
WORKING:
OBD Auto Doctor 1.6.2
OBD Auto Doctor 1.7.2 DEMO
Torque Lite 1.1.49 for Android
NOT WORKING:
Dashcommand v3.0.1 (Build 2770)
EasyObdII 2.5.0 Free Version
OBDToolbox V0.3
OBDwiz 2.16.3 demo
PCMScan v2.4.12 (Build 1194) demo
Scan Master Free 0.4.0.0
Scantool_net113win
scantool_net121win
Scanxl Professional v3.5.1 demo
VCDS Lite 1.2
Sunday, April 13, 2014
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