diff --git a/synapse/rest/client/sendtodevice.py b/synapse/rest/client/sendtodevice.py
new file mode 100644
index 0000000000..3322c8ef48
--- /dev/null
+++ b/synapse/rest/client/sendtodevice.py
@@ -0,0 +1,72 @@
+# Copyright 2016 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+from typing import TYPE_CHECKING, Awaitable, Tuple
+
+from synapse.http import servlet
+from synapse.http.server import HttpServer
+from synapse.http.servlet import assert_params_in_dict, parse_json_object_from_request
+from synapse.http.site import SynapseRequest
+from synapse.logging.opentracing import set_tag, trace
+from synapse.rest.client.transactions import HttpTransactionCache
+from synapse.types import JsonDict
+
+from ._base import client_patterns
+
+if TYPE_CHECKING:
+ from synapse.server import HomeServer
+
+logger = logging.getLogger(__name__)
+
+
+class SendToDeviceRestServlet(servlet.RestServlet):
+ PATTERNS = client_patterns(
+ "/sendToDevice/(?P<message_type>[^/]*)/(?P<txn_id>[^/]*)$"
+ )
+
+ def __init__(self, hs: "HomeServer"):
+ super().__init__()
+ self.hs = hs
+ self.auth = hs.get_auth()
+ self.txns = HttpTransactionCache(hs)
+ self.device_message_handler = hs.get_device_message_handler()
+
+ @trace(opname="sendToDevice")
+ def on_PUT(
+ self, request: SynapseRequest, message_type: str, txn_id: str
+ ) -> Awaitable[Tuple[int, JsonDict]]:
+ set_tag("message_type", message_type)
+ set_tag("txn_id", txn_id)
+ return self.txns.fetch_or_execute_request(
+ request, self._put, request, message_type, txn_id
+ )
+
+ async def _put(
+ self, request: SynapseRequest, message_type: str, txn_id: str
+ ) -> Tuple[int, JsonDict]:
+ requester = await self.auth.get_user_by_req(request, allow_guest=True)
+
+ content = parse_json_object_from_request(request)
+ assert_params_in_dict(content, ("messages",))
+
+ await self.device_message_handler.send_device_message(
+ requester, message_type, content["messages"]
+ )
+
+ return 200, {}
+
+
+def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
+ SendToDeviceRestServlet(hs).register(http_server)
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