Wiznet WizFi210 User Manual page 28

as needed. However, the Adapter does not accept any new TCP/UDP client/server or data
connection requests.
The ATO command (terminated by the ASCII character "O", not the number 0) is used to
return to data mode.
Applying the <AT+XEHT> command (Enable Hardware Trigger), you can change between
data mode and command mode using GPIO 29, without escape sequence ("+++"). But it
should be noted that GPIO number is different depending on the firmware version.
AT+XEHT=2,1,0,3 (HW Trigger-GPIO29, ButtonAction-GPIO21)
AT+XEHT=1,0,0,1 (HW Trigger-GPIO10, ButtonAction-GPIO10) (in old EVB)
But when you use GPIO29(GPIO10) for data/command mode transition, there should be no
UART input in 300mS before and after sending signal to GPIO29(GPIO10) for mode
transition time and buffer processing time.
Using D2(GPIO 31), D4(GPIO 28) of WizFi210, you can see if the WizFi210 is associated to
the AP and if serial-to-wifi network channel is normal.
And applying the "AT+XDUM=1" command (Disable UART Message), all UART messages are
blocked in data mode. In this situation, you have to check the signal of GPIO 28 and GPIO
31 to know disassociation or network connection closed.
In data mode, the Nagle Algorithm Wait Time can be used to buffer any characters to be
sent, in order to avoid sending a large number of packets with small payloads onto the
network. The wait time is specified in units of 10 milliseconds. This functionality is available
for both UDP and TCP connections.
22
(WIZnet Co., Ltd.)
WizFi 210/220 User Manual