diff --git a/jf-live-writer/include/broker_format.hpp b/jf-live-writer/include/broker_format.hpp
new file mode 100644
index 0000000..9943d9c
--- /dev/null
+++ b/jf-live-writer/include/broker_format.hpp
@@ -0,0 +1,21 @@
+#ifndef SF_DAQ_BUFFER_BROKER_FORMAT_HPP
+#define SF_DAQ_BUFFER_BROKER_FORMAT_HPP
+
+#include "formats.hpp"
+
+const static uint8_t OP_CONTINUE = 0;
+const static uint8_t OP_START = 1;
+const static uint8_t OP_END = 2;
+
+#pragma pack(push)
+#pragma pack(1)
+struct StoreStream {
+    uint8_t op_code;
+    uint32_t i_image;
+    uint32_t n_images;
+    int64_t run_id;
+
+    ImageMetadata image_metadata;
+};
+#pragma pack(pop)
+#endif //SF_DAQ_BUFFER_BROKER_FORMAT_HPP