diff --git a/tests/components/rflink/test_init.py b/tests/components/rflink/test_init.py
index f93c9703d30..73def144aba 100644
--- a/tests/components/rflink/test_init.py
+++ b/tests/components/rflink/test_init.py
@@ -7,15 +7,24 @@ from voluptuous.error import MultipleInvalid
 
 from homeassistant.bootstrap import async_setup_component
 from homeassistant.components.rflink import (
+    CONF_KEEPALIVE_IDLE,
     CONF_RECONNECT_INTERVAL,
     DATA_ENTITY_LOOKUP,
+    DEFAULT_TCP_KEEPALIVE_IDLE_TIMER,
+    DOMAIN as RFLINK_DOMAIN,
     EVENT_KEY_COMMAND,
     EVENT_KEY_SENSOR,
     SERVICE_SEND_COMMAND,
     TMP_ENTITY,
     RflinkCommand,
 )
-from homeassistant.const import ATTR_ENTITY_ID, SERVICE_STOP_COVER, SERVICE_TURN_OFF
+from homeassistant.const import (
+    ATTR_ENTITY_ID,
+    CONF_HOST,
+    CONF_PORT,
+    SERVICE_STOP_COVER,
+    SERVICE_TURN_OFF,
+)
 
 
 async def mock_rflink(
@@ -380,3 +389,90 @@ async def test_not_connected(hass, monkeypatch):
     RflinkCommand.set_rflink_protocol(None)
     with pytest.raises(HomeAssistantError):
         await test_device._async_handle_command("turn_on")
+
+
+async def test_keepalive(hass, monkeypatch, caplog):
+    """Validate negative keepalive values."""
+    keepalive_value = -3
+    domain = RFLINK_DOMAIN
+    config = {
+        RFLINK_DOMAIN: {
+            CONF_HOST: "10.10.0.1",
+            CONF_PORT: 1234,
+            CONF_KEEPALIVE_IDLE: keepalive_value,
+        }
+    }
+
+    # setup mocking rflink module
+    _, mock_create, _, _ = await mock_rflink(hass, config, domain, monkeypatch)
+
+    assert mock_create.call_args_list[0][1]["host"] == "10.10.0.1"
+    assert mock_create.call_args_list[0][1]["port"] == 1234
+    assert (
+        mock_create.call_args_list[0][1]["keepalive"] is None
+    )  # negative keepalive is not allowed
+    assert (
+        f"A bogus TCP Keepalive IDLE timer was provided ({keepalive_value} secs)"
+        in caplog.text
+    )
+
+
+async def test2_keepalive(hass, monkeypatch, caplog):
+    """Validate very short keepalive values."""
+    keepalive_value = 30
+    domain = RFLINK_DOMAIN
+    config = {
+        RFLINK_DOMAIN: {
+            CONF_HOST: "10.10.0.1",
+            CONF_PORT: 1234,
+            CONF_KEEPALIVE_IDLE: keepalive_value,
+        }
+    }
+
+    # setup mocking rflink module
+    _, mock_create, _, _ = await mock_rflink(hass, config, domain, monkeypatch)
+
+    assert mock_create.call_args_list[0][1]["host"] == "10.10.0.1"
+    assert mock_create.call_args_list[0][1]["port"] == 1234
+    assert (
+        mock_create.call_args_list[0][1]["keepalive"] == keepalive_value
+    )  # very short keepalive is allowed but warned
+    assert (
+        f"A very short TCP Keepalive IDLE timer was provided ({keepalive_value} secs)"
+        in caplog.text
+    )
+
+
+async def test3_keepalive(hass, monkeypatch, caplog):
+    """Validate keepalive=0 value."""
+    domain = RFLINK_DOMAIN
+    config = {
+        RFLINK_DOMAIN: {CONF_HOST: "10.10.0.1", CONF_PORT: 1234, CONF_KEEPALIVE_IDLE: 0}
+    }
+
+    # setup mocking rflink module
+    _, mock_create, _, _ = await mock_rflink(hass, config, domain, monkeypatch)
+
+    assert mock_create.call_args_list[0][1]["host"] == "10.10.0.1"
+    assert mock_create.call_args_list[0][1]["port"] == 1234
+    assert (
+        mock_create.call_args_list[0][1]["keepalive"] is None
+    )  # keepalive=0 will disable it
+    assert "TCP Keepalive IDLE timer was provided" not in caplog.text
+
+
+async def test_default_keepalive(hass, monkeypatch, caplog):
+    """Validate keepalive=0 value."""
+    domain = RFLINK_DOMAIN
+    config = {RFLINK_DOMAIN: {CONF_HOST: "10.10.0.1", CONF_PORT: 1234}}
+
+    # setup mocking rflink module
+    _, mock_create, _, _ = await mock_rflink(hass, config, domain, monkeypatch)
+
+    assert mock_create.call_args_list[0][1]["host"] == "10.10.0.1"
+    assert mock_create.call_args_list[0][1]["port"] == 1234
+    assert (
+        mock_create.call_args_list[0][1]["keepalive"]
+        == DEFAULT_TCP_KEEPALIVE_IDLE_TIMER
+    )  # no keepalive config will default it
+    assert "TCP Keepalive IDLE timer was provided" not in caplog.text