Forwarding NMEA 0183 Traffic from One Host to Another on Different Ports
NMEA 0183 (National Marine Electronics Association 0183) is a standard for transmitting and receiving data between marine electronic devices. This article will discuss how to forward NMEA 0183 traffic from one host to another on different ports.
Background
NMEA 0183 messages are typically transmitted over a serial connection, but they can also be transmitted over a network using TCP/IP. In this example, we will assume that one machine (192.168.11.100) is acting as an NMEA 0183 "talker" and transmitting messages over port 10110/TCP. We will also assume that another machine (192.168.11.110) is receiving NMEA strings on a different port.
Forwarding NMEA 0183 Traffic
To forward NMEA 0183 traffic from one host to another on different ports, you can use a network socket programming language such as Python. The following is an example Python script that forwards NMEA 0183 traffic from port 10110 on machine 192.168.11.100 to port 10111 on machine 192.168.11.110:
import socket
# Create a socket for the sender
sender = socket.socket(socket.AF\_INET, socket.SOCK\_STREAM)
# Bind the socket to the address and port of the sender
sender.bind(('192.168.11.100', 10110))
# Listen for incoming connections
sender.listen(1)
while True:
# Accept an incoming connection
connection, client\_address = sender.accept()
# Receive the data from the sender
received\_data = connection.recv(1024)
# Create a socket for the receiver
receiver = socket.socket(socket.AF\_INET, socket.SOCK\_STREAM)
# Connect to the address and port of the receiver
receiver.connect(('192.168.11.110', 10111))
# Send the data to the receiver
receiver.sendall(received\_data)
# Close the connection to the sender
connection.close()
# Close the socket for the receiver
receiver.close()
This script creates a socket for the sender, binds it to the address and port of the sender, and listens for incoming connections. When a connection is accepted, the script receives the data from the sender and sends it to the receiver. The script then closes the connection to the sender and the socket for the receiver.
Forwarding NMEA 0183 traffic from one host to another on different ports is a simple process that can be accomplished using a network socket programming language such as Python. By forwarding NMEA 0183 traffic, you can enable communication between marine electronic devices that are not directly connected to each other.
References
- National Marine Electronics Association (NMEA) 0183 Interface Standard
- Python Network Socket Programming Tutorial