Expose ElectrumClient::ping method

bdk-ffi/src/bdk.udl

@@ -1234,6 +1234,10 @@ interface ElectrumClient {
   /// Subscribes to notifications for new block headers, by sending a blockchain.headers.subscribe call.
   [Throws=ElectrumError]
   HeaderNotification block_headers_subscribe();
+
+  /// Pings the server.
+  [Throws=ElectrumError]
+  void ping();
 };
 
 /// Response to an ElectrumClient.server_features request.

bdk-ffi/src/electrum.rs

@@ -120,6 +120,10 @@ impl ElectrumClient {
             .map_err(ElectrumError::from)
             .map(HeaderNotification::from)
     }
+
+    pub fn ping(&self) -> Result<(), ElectrumError> {
+        self.0.inner.ping().map_err(ElectrumError::from)
+    }
 }
 
 pub struct ServerFeaturesRes {

bdk-jvm/lib/src/test/kotlin/org/bitcoindevkit/LiveElectrumClientTest.kt

@@ -58,4 +58,12 @@ class LiveElectrumClientTest {
         val headerNotification: HeaderNotification = electrumClient.blockHeadersSubscribe()
         println("Latest known block:\n$headerNotification")
     }
+
+    @Test
+    fun testPing() {
+        val electrumClient: ElectrumClient = ElectrumClient("ssl://electrum.blockstream.info:60002")
+        val ping = electrumClient.ping()
+
+        assert(ping == Unit)
+    }
 }