diff --git a/README.md b/README.md
index 8e65d21..4dcac65 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ Variable            | Default                        | Description
 `LOG_COLORIZED`     | `0`                            | Log using colors (`0`=disabled, `1`=enabled).
 `LOG_FTM`           | `%y%m%d %H:%M:%S`              | Log format prefix.
 `OUTPUT_TYPE`       | `JSON`                         | Set the output type to `JSON` or `PPRINT` (Only for a dry run).
+`UNCHANGED_EOL`     | `14400`                        | Unchanged End-Of-Life in X seconds. Prevents sending equal check data, a value of `0` disables `unchanged` _(defaults to 4 hours)_.
 
 ## Usage
 
diff --git a/libprobe/config.py b/libprobe/config.py
index 6d12948..b3dfdb7 100644
--- a/libprobe/config.py
+++ b/libprobe/config.py
@@ -17,7 +17,6 @@
         username: charlie
         password: "my other secret"
 """
-from typing import Optional
 import logging
 
 
@@ -50,7 +49,7 @@ def decrypt(layer, fernet):
             decrypt(v, fernet)
 
 
-def get_config(conf: dict, probe_name: str, asset_id: int, use: Optional[str]):
+def get_config(conf: dict, probe_name: str, asset_id: int, use: str | None):
     # use might both be None or an empty string, depending if the `_use` option
     # is available for the probe; both must be ignored
     probe = conf.get(use or probe_name)
diff --git a/libprobe/exceptions.py b/libprobe/exceptions.py
index 572e51d..5dbc621 100644
--- a/libprobe/exceptions.py
+++ b/libprobe/exceptions.py
@@ -1,5 +1,4 @@
 from .severity import Severity
-from typing import Optional
 
 
 class IgnoreResultException(Exception):
@@ -62,7 +61,7 @@ def __init__(
             self,
             msg: str,
             result: dict,
-            severity: Optional[Severity] = None):
+            severity: Severity | None = None):
         assert isinstance(result, dict)
         self.is_exception = severity is not None
         super().__init__(
diff --git a/libprobe/net/package.py b/libprobe/net/package.py
index 47d8e83..03d5151 100644
--- a/libprobe/net/package.py
+++ b/libprobe/net/package.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 import msgpack
 import struct
-from typing import Optional, Any
+from typing import Any
 
 
 class Package(object):
@@ -10,7 +10,7 @@ class Package(object):
 
     st_package = struct.Struct('<QIHBB')
 
-    def __init__(self, barray: Optional[bytearray] = None):
+    def __init__(self, barray: bytearray | None = None):
         if barray is None:
             return
 
diff --git a/libprobe/net/protocol.py b/libprobe/net/protocol.py
index 6e59e05..40e637f 100644
--- a/libprobe/net/protocol.py
+++ b/libprobe/net/protocol.py
@@ -1,6 +1,5 @@
 import asyncio
 import logging
-from typing import Union, Optional, Dict, Tuple
 from .package import Package
 
 
@@ -14,11 +13,11 @@ class Protocol(asyncio.Protocol):
     def __init__(self):
         super().__init__()
         self._buffered_data = bytearray()
-        self._package: Optional[Package] = None
-        self._requests: Dict[int, Tuple[asyncio.Future,
-                                        Optional[asyncio.Task]]] = dict()
+        self._package: Package | None = None
+        self._requests: dict[int, tuple[asyncio.Future,
+                                        asyncio.Task | None]] = dict()
         self._pid = 0
-        self.transport: Optional[asyncio.Transport] = None
+        self.transport: asyncio.Transport | None = None
 
     def connection_made(self, transport: asyncio.Transport):  # type: ignore
         '''
@@ -26,7 +25,7 @@ def connection_made(self, transport: asyncio.Transport):  # type: ignore
         '''
         self.transport = transport
 
-    def connection_lost(self, exc: Optional[Exception]):
+    def connection_lost(self, exc: Exception | None):
         '''
         override asyncio.Protocol
         '''
@@ -40,7 +39,7 @@ def is_connected(self) -> bool:
     def request(
         self,
         pkg: Package,
-        timeout: Union[None, float, int] = None
+        timeout: float | int | None = None
     ) -> asyncio.Future:
         self._pid += 1
         self._pid %= 0x10000
@@ -86,7 +85,7 @@ def data_received(self, data: bytes):
     def on_package_received(self, pkg: Package):
         raise NotImplementedError
 
-    async def _timer(self, pid: int, timeout: Union[float, int]):
+    async def _timer(self, pid: int, timeout: float | int):
         await asyncio.sleep(timeout)
         try:
             future, task = self._requests.pop(pid)
@@ -97,7 +96,7 @@ async def _timer(self, pid: int, timeout: Union[float, int]):
         future.set_exception(TimeoutError(
             f'request timed out on package id: {pid}'))
 
-    def _get_future(self, pkg: Package) -> Optional[asyncio.Future]:
+    def _get_future(self, pkg: Package) -> asyncio.Future | None:
         future, task = self._requests.pop(pkg.pid, (None, None))
         if future is None:
             logging.error(
diff --git a/libprobe/probe.py b/libprobe/probe.py
index b40cb6b..feb1c7d 100644
--- a/libprobe/probe.py
+++ b/libprobe/probe.py
@@ -11,7 +11,7 @@
 from cryptography.fernet import Fernet
 from pathlib import Path
 from setproctitle import setproctitle
-from typing import Optional, Dict, Tuple, Callable, Awaitable, Mapping
+from typing import Callable, Awaitable, Mapping
 from .exceptions import (
     CheckException,
     IgnoreResultException,
@@ -117,7 +117,7 @@ def __init__(
         logger.setup_logger()
         start_msg = 'starting' if dry_run is None else 'dry-run'
         logging.warning(f'{start_msg} probe collector: {name} v{version}')
-        self.loop: Optional[asyncio.AbstractEventLoop] = None
+        self.loop: asyncio.AbstractEventLoop | None = None
         self.name: str = name
         self.version: str = version
         self._checks_funs: Mapping[
@@ -125,18 +125,20 @@ def __init__(
             Callable[[Asset, dict, dict], Awaitable[dict]]] = checks
         self._config_path: Path = Path(config_path)
         self._connecting: bool = False
-        self._protocol: Optional[AgentcoreProtocol] = None
+        self._protocol: AgentcoreProtocol | None = None
         self._retry_next: int = 0
         self._retry_step: int = 1
-        self._local_config: Optional[dict] = None
-        self._local_config_mtime: Optional[float] = None
-        self._checks_config: Dict[
-            Tuple[int, int],
-            Tuple[Tuple[str, str], dict]] = {}
-        self._checks: Dict[Tuple[int, int], asyncio.Future] = {}
-        self._dry_run: Optional[Tuple[Asset, dict]] = \
+        self._local_config: dict | None = None
+        self._local_config_mtime: float | None = None
+        self._checks_config: dict[
+            tuple[int, int],
+            tuple[tuple[str, str], dict]] = {}
+        self._checks: dict[tuple[int, int], asyncio.Future] = {}
+        self._dry_run: tuple[Asset, dict] | None = \
             None if dry_run is None else self._load_dry_run_assst(dry_run)
         self._on_close: Callable[[], Awaitable[None]] | None = None
+        self._prev_checks: dict[tuple, tuple[float, dict]] = {}
+        self._unchanged_eol = float(os.getenv('UNCHANGED_EOL', '14400'))
 
         if not os.path.exists(config_path):
             try:
@@ -155,7 +157,7 @@ def __init__(
             logging.exception(f"configuration file invalid: {config_path}")
             exit(1)
 
-    def _load_dry_run_assst(self, dry_run: dict) -> Tuple[Asset, dict]:
+    def _load_dry_run_assst(self, dry_run: dict) -> tuple[Asset, dict]:
         asset = dry_run.get('asset')
 
         if not isinstance(asset, dict):
@@ -229,7 +231,7 @@ async def _start(self):
             for _ in range(step):
                 await asyncio.sleep(1)
 
-    def start(self, loop: Optional[asyncio.AbstractEventLoop] = None):
+    def start(self, loop: asyncio.AbstractEventLoop | None = None):
         """Start a Infrasonar probe
 
         Args:
@@ -376,11 +378,26 @@ async def _connect(self):
         finally:
             self._connecting = False
 
+    def _unchanged(self, path: tuple, result: dict | None) -> bool:
+        if not self._unchanged_eol:
+            return False
+        if result is None:
+            self._prev_checks.pop(path, None)
+            return False
+
+        eol, prev = self._prev_checks.get(path, (0.0, None))
+        now = time.time()
+        if eol > now and prev == result:
+            return True
+
+        self._prev_checks[path] = now + self._unchanged_eol, result
+        return False
+
     def send(
             self,
             path: tuple,
-            result: Optional[dict],
-            error: Optional[dict],
+            result: dict | None,
+            error: dict | None,
             ts: float,
             no_count: bool = False):
         asset_id, _ = path
@@ -388,14 +405,20 @@ def send(
             'duration': time.time() - ts,
             'timestamp': int(ts),
         }
-        if no_count:
-            framework['no_count'] = True
-
         check_data = {
-            'result': result,
             'error': error,
             'framework': framework
         }
+
+        if no_count:
+            framework['no_count'] = True
+
+        if self._unchanged(path, result):
+            logging.debug('using previous result (unchanged)')
+            framework['unchanged'] = True
+        else:
+            check_data['result'] = result
+
         pkg = Package.make(
             AgentcoreProtocol.PROTO_FAF_DUMP,
             partid=asset_id,
@@ -488,7 +511,7 @@ def _read_local_config(self):
         self._local_config_mtime = mtime
         self._local_config = config
 
-    def _asset_config(self, asset_id: int, use: Optional[str]) -> dict:
+    def _asset_config(self, asset_id: int, use: str | None) -> dict:
         try:
             self._read_local_config()
         except Exception:
diff --git a/libprobe/version.py b/libprobe/version.py
index a6221b3..3f6fab6 100644
--- a/libprobe/version.py
+++ b/libprobe/version.py
@@ -1 +1 @@
-__version__ = '1.0.2'
+__version__ = '1.0.3'