Add docs for Static Channel Backup

src/SUMMARY.md

@@ -15,4 +15,5 @@
   - [LNURL-Auth](guide/lnurl_auth.md)
 - [Supporting fiat currencies](guide/fiat_currencies.md)
 - [Buy Bitcoin](guide/buy_btc.md)
+- [Static Channel Backup](guide/static_channel_backup.md)
 - [Moving to production](guide/production.md)

src/guide/static_channel_backup.md

@@ -0,0 +1,109 @@
+# Static Channel Backup
+
+A static channel backup is automatically saved by the Breez SDK in the background. More specifically, the static backup is updated
+each time a new channel is opened.
+
+If the Greenlight node is not available, you can retrieve the static channel backup from the SDK's working directory as follows:
+
+<custom-tabs category="lang">
+<div slot="title">Rust</div>
+<section>
+
+```rust,ignore
+let backup_data = BreezServices::static_backup(StaticBackupRequest {
+    working_dir: "<working directory>".into(),
+})?;
+```
+
+</section>
+
+<div slot="title">Swift</div>
+<section>
+
+```swift
+do {
+    let backupData = breez_sdk.staticBackup(workingDir: "<working directory>");    
+} catch{
+    // handle error
+}
+```
+
+</section>
+
+<div slot="title">Android</div>
+<section>
+
+```kotlin,ignore
+try {
+    val backupData = staticBackup("<working directory>")
+} catch (e: Exception) {
+    // handle error
+}
+```
+
+</section>
+
+<div slot="title">React Native</div>
+<section>
+
+```typescript
+try {
+    let backupData = await staticBackup("<working directory>");
+} catch (error) {
+    console.log(error)
+}
+```
+
+</section>
+
+<div slot="title">Dart</div>
+<section>
+
+```dart
+try {
+    StaticBackupResponse backupData = await staticBackup(workingDir: "<working directory>");
+} catch (error) {
+   // handle error
+}
+```
+</section>
+
+<div slot="title">Python</div>
+<section>
+
+```python
+try:
+    backup_data = breez_sdk.static_backup("<working directory>")    
+except Exception as error:
+    # Handle error
+```
+</section>
+
+<div slot="title">Go</div>
+<section>
+
+```go
+backupData, err := breez_sdk.StaticBackup("<working directory>")
+if err != nil {
+    log.Fatalf("Failed to retrieve static backup data: %#v", err)
+}
+```
+</section>
+
+<div slot="title">C#</div>
+<section>
+
+```cs
+using Breez.Sdk;
+
+StaticBackupResponse backupData;
+try 
+{
+    backupData = BreezSdkMethods.StaticBackup("<working directory>");  
+} catch (Exception) 
+{
+   // Handle error
+}
+```
+</section>
+</custom-tabs>