diff --git a/threadnetwork/aidl/default/socket_interface.cpp b/threadnetwork/aidl/default/socket_interface.cpp
index a8b434a..6b9b80e 100644
--- a/threadnetwork/aidl/default/socket_interface.cpp
+++ b/threadnetwork/aidl/default/socket_interface.cpp
@@ -83,6 +83,12 @@
     mReceiveFrameBuffer = nullptr;
 }
 
+otError SocketInterface::SendFrame(const uint8_t* aFrame, uint16_t aLength) {
+    Write(aFrame, aLength);
+
+    return OT_ERROR_NONE;
+}
+
 void SocketInterface::UpdateFdSet(void* aMainloopContext) {
     otSysMainloopContext* context = reinterpret_cast<otSysMainloopContext*>(aMainloopContext);
 
@@ -95,6 +101,12 @@
     }
 }
 
+void SocketInterface::Write(const uint8_t* aFrame, uint16_t aLength) {
+    ssize_t rval = TEMP_FAILURE_RETRY(write(mSockFd, aFrame, aLength));
+    VerifyOrDie(rval >= 0, OT_EXIT_ERROR_ERRNO);
+    VerifyOrDie(rval > 0, OT_EXIT_FAILURE);
+}
+
 int SocketInterface::OpenFile(const ot::Url::Url& aRadioUrl) {
     int fd = -1;
     sockaddr_un serverAddress;
diff --git a/threadnetwork/aidl/default/socket_interface.hpp b/threadnetwork/aidl/default/socket_interface.hpp
index 23940f5..2dd315d 100644
--- a/threadnetwork/aidl/default/socket_interface.hpp
+++ b/threadnetwork/aidl/default/socket_interface.hpp
@@ -73,6 +73,20 @@
     void Deinit(void);
 
     /**
+     * Sends a Spinel frame to Radio Co-processor (RCP) over the
+     * socket.
+     *
+     * @param[in] aFrame     A pointer to buffer containing the Spinel frame to
+     * send.
+     * @param[in] aLength    The length (number of bytes) in the frame.
+     *
+     * @retval OT_ERROR_NONE     Successfully sent the Spinel frame.
+     * @retval OT_ERROR_FAILED   Failed to send a frame.
+     *
+     */
+    otError SendFrame(const uint8_t* aFrame, uint16_t aLength);
+
+    /**
      * Updates the file descriptor sets with file descriptors used by the radio
      * driver.
      *
@@ -123,6 +137,15 @@
 
   private:
     /**
+     * Writes a given frame to the socket.
+     *
+     * @param[in] aFrame  A pointer to buffer containing the frame to write.
+     * @param[in] aLength The length (number of bytes) in the frame.
+     *
+     */
+    void Write(const uint8_t* aFrame, uint16_t aLength);
+
+    /**
      * Opens file specified by aRadioUrl.
      *
      * @param[in] aRadioUrl  A reference to object containing path to file and