Firmware Version 4.0
NMEA2WIFI AP NETWORK
You can operate NMEA2WIFI in two modes: AP or Client Sation. In AP (Access Point) mode,
NMEA2WIFI creates a wifi network and smartphones, tablets or computers connect to this wifi network to
receive/send data from/to NMEA2WIFI. In Client Station mode, NMEA2WIFI joins an existing external wifi
network and transmits/receives wifi data on that network. NMEA2WIFI always creates its own
AP network, even when you set NMEA2WIFI to join an existing network.
In this panel, you specify the name and the password of the wifi network that smartphones,
tablets and computers should use to join this network.
When working as an Access Point, NMEA2WIFI uses IP address 192.168.4.1 and
supports DHCP. A maximum of 5 clients can join the network and are assigned
consecutive IP addresses (eg 192.168.4.2 ...). Security is WPA2-PSK. Ssid and Password can have
a maximum of 15 characters and a minimum of 4 and 8 characters, respectively.
When you need to change any setting of NMEA2WIFI you should connect to this newtork
and then write 192.168.4.1 in the navigation bar of a browser to get the page that you
are reading now.
If you have already a working wifi network and want NMEA2WIFI to
join that network as a Client Station, you should enter here the authentication parameters that
NEMA2WIFI should use to join this existing network. Ssid and Password can have a maximum and a minimum
size of characters as before. The IP address of NMEA2WIFI on this network is assigned by
the network and appears on the corresponding text box when NMEA2WIFI gets a connection.
SERIAL PORTS SETTINGS
NMEA2WIFI has two input serial ports named as P#1 and P#2
and one serial output port, named as P#3.
The baud rate of serial input P#1 can be 4800 or 9600 baud. The
baud rates of P#2 and P#3 are adjustable between
4800, 9600, 19200 or 38400. It is important to note that if the baud rate of the
output port is inferior to those of the input ports, data may be lost.
Data transmitted over the output serial port P#3 can be any combination of 3 data streams:
data from the input serial port P#1; data from the input serial port P#2; and data from
the UDP receive port.
NMEA2WIFI follows the UDP protocol to send and receive data through wifi
using two different ports: one for transmitting and one for receiving. Both port numbers
should be chosen in the range from 1024 up to 65535.
The transmit port
number should be the same in both the sender (the NMEA2WIFI multiplexer) and the listeners.
By default, NMEA2WIFI uses UDP transmit port number 2000, which is compatible with Navionics Sonar
Chart Live. The IP address used for UDP data transmission is the last address
(X.X.X.255) in the working subnet. For example, in NMEA2WIFI AP NETWORK mode, this IP
address is 192.168.4.255 which assures that all clients in the corresponding subnet listening
to the specified UDP port number will receive the packets.
The receive port should be different
from the transmit port and it is 2222 by default. You should set this number in
the connecting devices that send data to the NMEA2WIFI multiplexer. You can set these devices
for unicast or broadcast UDP transmission. For unicast you specify the IP address 192.168.4.1 if
the multiplexer is in NMEA2WIFI AP NETWORK mode or the IP address that was assigned by the external network
when the multiplexer gets a connection to the external network. You can change the last byte
of the IP address to 255 and use UDP broadcasting.
You can also set which data will be transmitted by UDP. It can be any combination of the NMEA0183
data appearing at the two input serial ports P#1 and P#2.
SETTING OPERATING MODES
In addition to the above parameters, you have 2 radio buttons
to choose between: (i) working in AP mode only or (ii) also connect as a Client Station.
You press the SET button for NMEA2WIFI to accept the parameters in this page. If there
are no errors in the parameters, NMEA2WIFI changes its operation to the mode and settings selected.
Pressing the Set Factory Defaults button is the same as an hardware reset of the
system. The factory setting uses the following parameters:
Mode: Access Point; Ssid: NMEA2WIFI; Password: 12345678; IP Address: 192.168.4.1; UDP Transmit Port
Number: 2000; UDP Receive Port Number: 2222; Serial Port P#1 Baud Rate: 4800; Serial Ports P#2 and P#3
Baud Rates: 38400; Serial Output on P#3: none; Wifi Output: both P#1 and P#2.