WiSnap User Manual 2.21 04112011-JF
Page
63
of
66
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DHCP cache
The
set ip dhcp 3
command is now used to enable DHCP address caching.
Once caching is turned on, the initial DHCP settings are stored in NVRAM. This is most useful
in battery systems, when using the sleep mode. Upon waking from sleep, as long as the
DHCP lease time is still valid and the WiSnap is associated to the same AP, DHCP caching
does not survive a power cycle or usage of the hardware reset pin.
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ARP table cache
The
set ip flags 0x20
command is now used to enable ARP table caching.
Once caching is turned on, any ARP table settings are backed up to NVRAM before sleep.
Upon waking from sleep, the ARP cache is loaded. ARP table caching does not survive a
power cycle or usage of the hardware reset pin.
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DNS host address cache.
The
set ip flags 0x10
command enables DHCP address
caching. Once caching is turned on, the initial DHCP settings are stored in NVRAM. This is
most useful in battery systems, when using the sleep mode. Upon waking from sleep, as long
as the DHCP lease time is valid and the WiSnap is associated to the same AP, DNS caching
does not survive a power cycle or usage of the hardware reset pin.
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UART break detect enables sleep.
The command
set UART mode 8
enables break
detection on the UART RX pin. Once Break is detected (a consistent low value on RX pin),
WiSnap waits for the UART RX pin to return to a high value before going to sleep.
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UART NOECHO mode.
The command
set UART mode 1
is now used to disable echoing of
RX chars while in command mode. This is useful
when embedded controllers are used to
send commands to the module. NOTE: For consistency, the command prompt response
<2.xx>
now also contains
\r\n
appended string when in this mode.
As of Version 2.12 9/17/2009
•
Fixed problem with some newer 802.11n - association attempts cause module to
crash/reboot. (Such as Linksys WRT160NL)
•
Fixed problem with send on match character i.e.
set comm match <char>
. Match char is
now operational.
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During an open TCP session, a second incoming connection would be accepted. Second
connection is now accepted but then immediately closed.
•
Hardware flow control is now supported. To enable, use the
“set UART flow 1”
command.
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DHCP renew and rebind is fully supported. Previously, DHCP renew/rebind would update IP
settings, and if a TCP session was active it would enter a hung state. TCP connections now
survive a DHCP renew/rebind.
Features
•
TCP connection password
. This optional pass word is enabled with the command “set opt
pass <string>”, incoming connections will be challenged and the stored password must be
matched or the connection will be closed.
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UART instant baudrate
The
set UART instant <rate>
command
immediately changes the
baudrate. This is useful when testing baudrate settings, or switching baudrate “on the fly”
remotely while connected over TCP.
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Analog interface
commands
The “show q” command will now enable and show the digital
value of the analog interface pins. See section 16
Version 2.11 9/8/2009 – Limited release (please update to 2.12 or later)
