# EC25 & EC21 1NCE OS UDP

> For the complete documentation index, see [llms.txt](https://help.1nce.com/llms.txt).

```powershell PowerShell
AT+QIOPEN=1,1,"UDP","udp.os.1nce.com",4445

OK

+QIOPEN: 1,0
AT+QISEND=1,17

> Welcome to 1NCEOS
SEND OK
AT+QICLOSE=1

OK
```

# Preparation

Configure the EC25/EC21 module with the appropriate network settings, such as the APN and operator ID, and ensure that it is connected to the cellular network.

# Open socket

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Use the AT+QIOPEN command to open a UDP socket and establish a connection with the remote server.

# Send the message to 1NCEOS

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For Send After receiving ">", input data (TEST), the maximum length of the data is 1460, the data beyond 1460 will be omitted. Then use `<CTRL+Z>` to send data. When receive SEND OK means the data has been sent, or you can specify number of Byte you want to send

# Close the Socket

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AT+QICLOSE command is used to close a socket connection established with a remote server using a TCP or UDP protocol. The command requires specifying the socket ID that was assigned when the connection was opened.