diff --git a/src/pywaveshare/boards/sim868/protocols.py b/src/pywaveshare/boards/sim868/protocols.py
index 725465c..4c8fb30 100644
--- a/src/pywaveshare/boards/sim868/protocols.py
+++ b/src/pywaveshare/boards/sim868/protocols.py
@@ -2,7 +2,30 @@
 import typing
 
 
-class SupportedProtocol(abc.ABC):
+class SupportedStandard(abc.ABC):
     NAME: typing.Optional[str] = None
 
     RESPONSE_PATTERN = r""
+
+
+class SMS(SupportedStandard):
+    NAME = "SMS"
+
+    RESPONSE_PATTERN = (
+        r"loremipsumdolorsitamet"
+        r"loremipsumdolorsitamet"
+        r"loremipsumdolorsitamet"
+        r"loremipsumdolorsitamet"
+        r"loremipsumdolorsitamet"
+        r"loremipsumdolorsitamet"
+        r"loremipsumdolorsitamet"
+    )
+
+
+class SupportedProtocolFactory:
+    pass
+
+
+if __name__ == "__main__":
+    protocol = SMS()
+    print(protocol.RESPONSE_PATTERN)
diff --git a/src/pywaveshare/boards/sim868/typedefs.py b/src/pywaveshare/boards/sim868/typedefs.py
index e69de29..4651c54 100644
--- a/src/pywaveshare/boards/sim868/typedefs.py
+++ b/src/pywaveshare/boards/sim868/typedefs.py
@@ -0,0 +1,9 @@
+import typing
+
+SMSSend = typing.TypedDict(
+    "SMSSend",
+    {
+        "Recipients": typing.List[str],
+        "Message": str,
+    },
+)
diff --git a/src/pywaveshare/boards/sim868/worker.py b/src/pywaveshare/boards/sim868/worker.py
index 6becadd..29df146 100644
--- a/src/pywaveshare/boards/sim868/worker.py
+++ b/src/pywaveshare/boards/sim868/worker.py
@@ -1,6 +1,6 @@
 import threading
 
-from . import config, itc
+from . import config, itc, protocols
 
 
 class Worker(threading.Thread):
@@ -10,6 +10,7 @@ def __init__(self, config: config.Config) -> None:
         super().__init__()
 
         self.config = config
+        self.protocols = protocols.SupportedProtocolFactory()
 
     def run(self) -> None:
         itc.IS_WORKER_RUNNING.set()