UDP responses from multiple PCs

My laptop is on a local area network that consists of the laptop, a switch, and two RF switch boxes.
Not connected to the corporate network.
According to the equpment vendor a command can be broadcast to the local network using UDP and all tthe boxes that receive the request will respond.
The VI that they gave me only shows the response for one the boxes at a time.
How do I go about modifying the VI so that the response from both boxes are received?
Attached is their VI which I have simplified. The IPv4 address is for my laptop.
The boxes are at 192.168.0.141 and 192.,168.0.142

nyc wrote:
There is no input specifically called "local broadcast address".
With "local broadcast address" I meant the "broadcast address for the local subnet".
You are always sending from your own address. That's your own unicast IP address which is automatically added to the header of all outgoing packets. The devices at the other end will respond to the broadcast with a unicast to the source IP of the received packet, i.e. your adapter. Same for the port. "open UDP" reserves a local port, which is used as source port for the outging packets. The destination port is whatever the other devices are listening at, so you have no choice.
All adapters receive messages to their assigned IP address, to the local subnet broadcast address, to the generic broadcast address (255.255.255.255) as well as to certain multicast addresses. On the local subnet, things are actually guided by the MAC address and each adapter maintains an ARP table to correctly form the ethernet header. Your local switches will know (from learning) all connnected MAC addresses and their assigned IPs and will send out any incoming packet to the right connecter. They recognize broadcasts and will automatically send them out on all other connectors. If the address is not local, the ethernet packet is set to the MAC address of the router (the default gateway) and it will read the destination IP to determine which interface (i.e. other subnet) the packet should go out, etc.
nyc wrote:
Could you explain whey the IPv4 address is being OR'd with the negate of the subnet mask?
I am clueless as to the purpose.
Well, that's the correct math, look it up! (the original code does exactly the same, but in a Rube Goldberg kind of way )
For example if your IP address is:
192.168.5.45 and the netmask is 255.255.255.0, the broadcast address is 192.168.5.255
10.47.5.45 and the netmask is 255.0.0.0, the broadcast address is 10.255.255.255
etc.
Thus the local subnet broadcast addrees can be determined from the IP address and netmask.
Note that each address is internally just a U32 integer and boolean operations will function bitwise.

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