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Hi Everyone,
I'm planning to make Wi-Fi Web-server to send and receive data from Smart phones.
Configuration as follows ( Router/AP not to be used!);


Which is the most economical Wi-Fi module with built-in server code/library for Arduino?
WIZFI210, wiFly, Flyport etc..??

Any help would be much appreciated!
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One thing you need to investigate is whether the device(s) support ad-hoc networking. Most shields do not, since that takes quite a bit of effort. Connecting a WiFi shield to an existing network is one thing. Creating a network is quite a bit more complicated.
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One thing you need to investigate is whether the device(s) support ad-hoc networking. Most shields do not, since that takes quite a bit of effort. Connecting a WiFi shield to an existing network is one thing. Creating a network is quite a bit more complicated.
Thanks PaulS

Can this be used?
http://www.sparkfun.com/products/10822

Features:
 Based on common 802.15.4 XBee footprint
 Ultra low power: 4uA sleep mode, 38mA active
 Onboard TCP/IP stack includes DHCP, UDP, DNS, ARP, ICMP, HTTP client, FTP client and TCP
 Firmware configurable transmit power: 0dBm to 12dBm
 Hardware interfaces:TTL UART
 Host data rate up to 464Kbps over UART
 Supports Adhoc and infrastructure networking
 8 general purpose digital I/O
 3 analog sensor inputs
 Real-time clock for time-stamping, auto-sleep, and auto-wakeup modes
 Accepts 3.3VDC regulated power supply
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Can this be used?
I don't know. If you do get one, and it works, be sure to let us know. I'd get one, then, to play with.
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Can this be used?
I don't know. If you do get one, and it works, be sure to let us know. I'd get one, then, to play with.

Sure ...  smiley-grin
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The Arduino Hydrogen WiFi shield supports Adhoc networking. It's available at diysandbox.com and they claim that their library is compatible to the Arduino Ethernet library.

I can't verify  the latter statement as I have not yet had time to test that, however the samples that they host on github worked out "of the box" including the adhoc networking
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