> For the complete documentation index, see [llms.txt](https://doc.cess.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.cess.network/developer/cess-sdk/sdk-golang/initialization.md).

# Initialization

Before using SDK, it is necessary to create an SDK object that includes some configuration items in the following table. Please fill in according to the actual situation:

| configuration       | Description                                                         | Method                   |
| ------------------- | ------------------------------------------------------------------- | ------------------------ |
| RPC address         | CESS chain rpc address                                              | sdkgo.ConnectRpcAddrs    |
| Mnemonic            | CESS wallet mnemonic phrase, if empty, no transaction can be made.  | sdkgo.Mnemonic           |
| Transaction timeout | Timed out waiting for transaction completion, default is 30 seconds | sdkgo.TransactionTimeout |
| SDK name            | It's just a name, default is `cess-sdk-go`                          | sdkgo.Name               |

### Create a query-only sdk client

```golang
package main

import (
    "context"
    "fmt"

    sdkgo "github.com/CESSProject/cess-go-sdk"
)

var RPC_ADDRS = []string{
    //testnet
    "wss://testnet-rpc.cess.network/ws/",
}

func main() {
    sdk, err := cess.New(
        context.Background(),
        sdkgo.ConnectRpcAddrs(RPC_ADDRS),
    )
    if err != nil {
        panic(err)
    }
    defer sdk.Close()
    fmt.Println(sdk.SystemVersion())
}
```

### Create a fully functional sdk client

```golang
package main

import (
    "context"
    "fmt"
    "time"

    sdkgo "github.com/CESSProject/cess-go-sdk"
)

// Substrate well-known mnemonic:
//
//   - https://github.com/substrate-developer-hub/substrate-developer-hub.github.io/issues/613
//   - cXgaee2N8E77JJv9gdsGAckv1Qsf3hqWYf7NL4q6ZuQzuAUtB
var MY_MNEMONIC = "bottom drive obey lake curtain smoke basket hold race lonely fit walk"

var RPC_ADDRS = []string{
    //testnet
    "wss://testnet-rpc.cess.network/ws/",
}

func main() {
    sdk, err := cess.New(
        context.Background(),
        sdkgo.ConnectRpcAddrs(RPC_ADDRS),
        sdkgo.Mnemonic(MY_MNEMONIC),
        sdkgo.TransactionTimeout(time.Second*10),
    )
    if err != nil {
        panic(err)
    }
    defer sdk.Close()
    fmt.Println(sdk.SystemVersion())
}
```