diff --git a/src/ngcft1.cpp b/src/ngcft1.cpp
index 6726a9a..9f29264 100644
--- a/src/ngcft1.cpp
+++ b/src/ngcft1.cpp
@@ -169,8 +169,6 @@ void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_
 					return;
 				}
 
-				assert(ngc_ft1_ctx->cb_send_data.count(tf.file_kind));
-
 				// if chunks in flight < window size (2)
 				//while (tf.ssb.size() < ngc_ft1_ctx->options.packet_window_size) {
 				int64_t can_packet_size {static_cast<int64_t>(peer.cca.canSend())};
@@ -198,14 +196,26 @@ void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_
 
 					new_data.resize(chunk_size);
 
-					ngc_ft1_ctx->cb_send_data[tf.file_kind](
-						tox,
-						group_number, peer_number,
-						idx,
-						tf.file_size_current,
-						new_data.data(), new_data.size(),
-						ngc_ft1_ctx->ud_send_data.count(tf.file_kind) ? ngc_ft1_ctx->ud_send_data.at(tf.file_kind) : nullptr
+					//ngc_ft1_ctx->cb_send_data[tf.file_kind](
+						//tox,
+						//group_number, peer_number,
+						//idx,
+						//tf.file_size_current,
+						//new_data.data(), new_data.size(),
+						//ngc_ft1_ctx->ud_send_data.count(tf.file_kind) ? ngc_ft1_ctx->ud_send_data.at(tf.file_kind) : nullptr
+					//);
+					assert(idx <= 0xffu);
+					// TODO: check return value
+					dispatch(
+						NGCFT1_Event::send_data,
+						Events::NGCFT1_send_data{
+							group_number, peer_number,
+							static_cast<uint8_t>(idx),
+							tf.file_size_current,
+							new_data.data(), new_data.size(),
+						}
 					);
+
 					uint16_t seq_id = tf.ssb.add(std::move(new_data));
 					sendPKG_FT1_DATA(group_number, peer_number, idx, seq_id, tf.ssb.entries.at(seq_id).data.data(), tf.ssb.entries.at(seq_id).data.size());
 					peer.cca.onSent({idx, seq_id}, chunk_size);
diff --git a/src/ngcft1.hpp b/src/ngcft1.hpp
index 87b20a2..131f5c7 100644
--- a/src/ngcft1.hpp
+++ b/src/ngcft1.hpp
@@ -16,49 +16,79 @@
 #include <map>
 #include <set>
 
-// TODO: events
-//typedef void NGC_FT1_recv_request_cb(
-	//Tox *tox,
-	//uint32_t group_number, uint32_t peer_number,
-	//const uint8_t* file_id, size_t file_id_size,
-	//void* user_data
-//);
+namespace Events {
 
-// return true to accept, false to deny
-//typedef bool NGC_FT1_recv_init_cb(
-	//Tox *tox,
-	//uint32_t group_number, uint32_t peer_number,
-	//const uint8_t* file_id, size_t file_id_size,
-	//const uint8_t transfer_id,
-	//const size_t file_size,
-	//void* user_data
-//);
+	struct NGCFT1_recv_request {
+		uint32_t group_number;
+		uint32_t peer_number;
 
-//typedef void NGC_FT1_recv_data_cb(
-	//Tox *tox,
+		NGCFT1_file_kind file_kind;
 
-	//uint32_t group_number,
-	//uint32_t peer_number,
-	//uint8_t transfer_id,
+		const uint8_t* file_id;
+		size_t file_id_size;
+	};
 
-	//size_t data_offset, const uint8_t* data, size_t data_size,
-	//void* user_data
-//);
+	struct NGCFT1_recv_init {
+		uint32_t group_number;
+		uint32_t peer_number;
 
-// request to fill data_size bytes into data
-//typedef void NGC_FT1_send_data_cb(
-	//Tox *tox,
+		NGCFT1_file_kind file_kind;
 
-	//uint32_t group_number,
-	//uint32_t peer_number,
-	//uint8_t transfer_id,
+		const uint8_t* file_id;
+		size_t file_id_size;
 
-	//size_t data_offset, uint8_t* data, size_t data_size,
-	//void* user_data
-//);
+		const uint8_t transfer_id;
+		const size_t file_size;
 
+		// return true to accept, false to deny
+		bool& accept;
+	};
 
-class NGCFT1 : public ToxEventI, public NGCEXTEventI {
+	struct NGCFT1_recv_data {
+		uint32_t group_number;
+		uint32_t peer_number;
+
+		uint8_t transfer_id;
+
+		size_t data_offset;
+		const uint8_t* data;
+		size_t data_size;
+	};
+
+	// request to fill data_size bytes into data
+	struct NGCFT1_send_data {
+		uint32_t group_number;
+		uint32_t peer_number;
+
+		uint8_t transfer_id;
+
+		size_t data_offset;
+		uint8_t* data;
+		size_t data_size;
+	};
+
+} // Events
+
+enum class NGCFT1_Event : uint8_t {
+	recv_request,
+	recv_init,
+	recv_data,
+	send_data,
+
+	MAX
+};
+
+struct NGCFT1EventI {
+	using enumType = NGCFT1_Event;
+	virtual bool onEvent(const Events::NGCFT1_recv_request&) { return false; }
+	virtual bool onEvent(const Events::NGCFT1_recv_init&) { return false; }
+	virtual bool onEvent(const Events::NGCFT1_recv_data&) { return false; }
+	virtual bool onEvent(const Events::NGCFT1_send_data&) { return false; } // const?
+};
+
+using NGCFT1EventProviderI = EventProviderI<NGCFT1EventI>;
+
+class NGCFT1 : public ToxEventI, public NGCEXTEventI, public NGCFT1EventProviderI {
 	ToxI& _t;
 	ToxEventProviderI& _tep;
 	NGCEXTEventProviderI& _neep;
diff --git a/src/plugin_ngcft1.cpp b/src/plugin_ngcft1.cpp
index fd9c732..8886269 100644
--- a/src/plugin_ngcft1.cpp
+++ b/src/plugin_ngcft1.cpp
@@ -33,11 +33,18 @@ SOLANA_PLUGIN_EXPORT uint32_t solana_plugin_start(struct SolanaAPI* solana_api)
 		return 1;
 	}
 
+	ToxI* tox_i = nullptr;
 	ToxEventProviderI* tox_event_provider_i = nullptr;
 
 	{ // make sure required types are loaded
+		tox_i = RESOLVE_INSTANCE(ToxI);
 		tox_event_provider_i = RESOLVE_INSTANCE(ToxEventProviderI);
 
+		if (tox_i == nullptr) {
+			std::cerr << "PLUGIN NGCEXT missing ToxI\n";
+			return 2;
+		}
+
 		if (tox_event_provider_i == nullptr) {
 			std::cerr << "PLUGIN NGCEXT missing ToxEventProviderI\n";
 			return 2;
@@ -47,10 +54,12 @@ SOLANA_PLUGIN_EXPORT uint32_t solana_plugin_start(struct SolanaAPI* solana_api)
 	// static store, could be anywhere tho
 	// construct with fetched dependencies
 	g_ngcextep = std::make_unique<NGCEXTEventProvider>(*tox_event_provider_i);
-	g_ngcft1 = std::make_unique<NGCFT1>(*tox_event_provider_i, *g_ngcextep.get());
+	g_ngcft1 = std::make_unique<NGCFT1>(*tox_i, *tox_event_provider_i, *g_ngcextep.get());
 
 	// register types
 	PROVIDE_INSTANCE(NGCEXTEventProviderI, "NGCEXT", g_ngcextep.get());
+
+	PROVIDE_INSTANCE(NGCFT1EventProviderI, "NGCEXT", g_ngcft1.get());
 	PROVIDE_INSTANCE(NGCFT1, "NGCEXT", g_ngcft1.get());
 
 	return 0;