This function receives a UDP telegram. If the characters are received, the function fills the ADD argument with the internal “UDP” of the sender. This buffer can then be passed to the udpSendTo function to send the answer.
This functionality is supported on PDMM, PCMM, and Simulators. PACs are not supported.
| En | Description | Execute the function |
| Data type | BOOL | |
| Range | [0,1] | |
| Unit | n/a | |
| Default | — | |
| sock | Description | ID of the socket |
| Data type | DINT | |
| Range | [0,+65535] | |
| Unit | n/a | |
| Default | — | |
| nb | Description | Maximum number of characters received |
| Data type | DINT | |
| Range | [0,+65535] | |
| Unit | n/a | |
| Default | — | |
| add[] | Description | Buffer containing the UDP address of the transmitter (filled on output) |
| Data type | USINT | |
| Range | [0,32] | |
| Unit | n/a | |
| Default | — | |
| data | Description | Buffer where to store received characters |
| Data type | STRING | |
| Range | [0,255] | |
| Unit | n/a | |
| Default | — |
| OK | Description | Returns true when the function successfully executes. See Function - General rules. |
| Data type | BOOL | |
| Unit | n/a | |
| Q | Description | Actual number of received characters |
| Data type | DINT | |
| Unit | n/a |
ReceivedBytes := udpRcvFrom(Socket_Number,5,add,data); //Read the position
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