---
sidebar_label: OpenTSDB Telnet Protocol
title: Schemaless - OpenTSDB Telnet Protocol
description: Insert data in OpenTSDB Telnet Protocol
---

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In this section we will explain how to write into TDengine cloud service using schemaless OpenTSDB Telnet protocols over REST interface.

## Config

Run this command in your terminal to save the TDengine cloud token and URL as variables:

<Tabs defaultValue="bash">
<TabItem value="bash" label="Bash">

```bash
export TDENGINE_CLOUD_TOKEN="<token>"
export TDENGINE_CLOUD_URL="<url>"
```

</TabItem>
<TabItem value="cmd" label="CMD">

```bash
set TDENGINE_CLOUD_TOKEN="<token>"
set TDENGINE_CLOUD_URL="<url>"
```

</TabItem>
<TabItem value="powershell" label="Powershell">

```powershell
$env:TDENGINE_CLOUD_TOKEN="<token>"
$env:TDENGINE_CLOUD_URL="<url>"
```

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</Tabs>

### Insert

You can use any client that supports the http protocol to access the RESTful interface address `<cloud_url>/opentsdb/v1/put` to write data in OpenTSDB compatible format to TDengine. The EndPoint is as follows:

```text
/opentsdb/v1/put/telnet/<db>?token=<cloud_token>
```

### Insert Example
- curl --request POST http://127.0.0.1:6041/opentsdb/v1/put/telnet/test --user "root:taosdata" --data-binary "sys.if.bytes.out  1479496100 1.3E0 host=web01 interface=eth0"
  
### Query Example with SQL
- select * from `sys.if.bytes.out` where host="web01" and interface="eth0"