diff --git a/run_tree/osx/arm64/debug/lumenarium b/run_tree/osx/arm64/debug/lumenarium
index 17af5b0..35a3987 100755
Binary files a/run_tree/osx/arm64/debug/lumenarium and b/run_tree/osx/arm64/debug/lumenarium differ
diff --git a/src/app/engine/sacn/foldhaus_sacn.h b/src/app/engine/sacn/foldhaus_sacn.h
index 7c03209..ae29913 100644
--- a/src/app/engine/sacn/foldhaus_sacn.h
+++ b/src/app/engine/sacn/foldhaus_sacn.h
@@ -275,10 +275,10 @@ InitStreamHeader (u8* Buffer, s32 BufferSize,
   Cursor = PackB1(Cursor, ADDRESS_AND_DATA_FORMAT);
   
   // DMP first property address
-  Cursor = PackB2(Cursor, 0);
+  Cursor = PackB1(Cursor, 0);
   
   // DMP Address Increment
-  Cursor = PackB2(Cursor, ADDRESS_INC);
+  Cursor = PackB1(Cursor, ADDRESS_INC);
   
   // Property Value Count -- Includes one byte for start code
   Cursor = PackB2(Cursor, SlotCount + 1);
diff --git a/src_v2/core/lumenarium_core_memory.h b/src_v2/core/lumenarium_core_memory.h
index 2f4e7ef..f732897 100644
--- a/src_v2/core/lumenarium_core_memory.h
+++ b/src_v2/core/lumenarium_core_memory.h
@@ -199,7 +199,7 @@ dw_get_u8(Data_Writer* w)
   u8 result = 0;
   if (w->at < w->data.size)
   {
-    result = w->data.base[w->at++];
+    result = w->data.base[w->at];
   }
   return result;
 }
diff --git a/src_v2/core/lumenarium_core_socket.h b/src_v2/core/lumenarium_core_socket.h
index c59b228..9b78460 100644
--- a/src_v2/core/lumenarium_core_socket.h
+++ b/src_v2/core/lumenarium_core_socket.h
@@ -3,6 +3,91 @@
 
 typedef struct { u64 value; } Socket_Handle;
 
-// TODO
+u16 endian_swap_u16(u16 v);
+u32 endian_swap_u32(u32 v);
+u64 endian_swap_u64(u64 v);
+
+#define hton_u16(v) endian_swap_u16(v)
+#define hton_u32(v) endian_swap_u32(v)
+#define hton_u64(v) endian_swap_u64(v)
+#define ntoh_s16(v) endian_swap_u16(v)
+#define ntoh_s32(v) endian_swap_u32(v)
+#define ntoh_s64(v) endian_swap_u64(v)
+
+
+//////////////////////////////////////////
+// Implementation
+
+u16
+endian_swap_u16(u16 v)
+{
+  u8* p = (u8*)&v;
+  u16 result = (u16)(
+    (p[0] << 8) |
+    (p[1] << 0)
+  );
+  return result;
+}
+
+u32
+endian_swap_u32(u32 v)
+{
+  u8* p = (u8*)&v;
+  u32 result = (u32)(
+    (p[0] << 24) |
+    (p[1] << 16) |
+    (p[2] <<  8) |
+    (p[3] <<  0)
+  );
+  return result;
+}
+
+u64
+endian_swap_u64(u64 v)
+{
+  u8* p = (u8*)&v;
+  u64 result = (u64)(
+    ((u64)p[0] << 56) |
+    ((u64)p[1] << 48) |
+    ((u64)p[2] << 40) |
+    ((u64)p[3] << 32) |
+    ((u64)p[4] << 24) |
+    ((u64)p[5] << 16) |
+    ((u64)p[6] <<  8) |
+    ((u64)p[7] <<  0)
+  );
+  return result;
+}
+
+#if defined(DEBUG)
+
+void 
+core_socket_tests()
+{
+  // u16 endian swap
+  u16 a_0 = 0xABCD;
+  u16 a_1 = endian_swap_u16(a_0);
+  u16 a_2 = endian_swap_u16(a_1);
+  assert(a_1 == 0xCDAB);
+  assert(a_2 == a_0);
+
+  // u32 endian swap
+  u32 b_0 = 0x89ABCDEF;
+  u32 b_1 = endian_swap_u32(b_0);
+  u32 b_2 = endian_swap_u32(b_1);
+  assert(b_1 == 0xEFCDAB89);
+  assert(b_2 == b_0);
+
+  // u64 endian swap
+  u64 c_0 = 0x7654321089ABCDEF;
+  u64 c_1 = endian_swap_u64(c_0);
+  u64 c_2 = endian_swap_u64(c_1);
+  assert(c_1 == 0xEFCDAB8910325476);
+  assert(c_2 == c_0);
+}
+
+#else
+#  define core_socket_tests() 
+#endif
 
 #endif // LUMENARIUM_CORE_SOCKET_H
\ No newline at end of file
diff --git a/src_v2/core/lumenarium_core_string.h b/src_v2/core/lumenarium_core_string.h
index 92a81ef..6f7b5b8 100644
--- a/src_v2/core/lumenarium_core_string.h
+++ b/src_v2/core/lumenarium_core_string.h
@@ -1,6 +1,8 @@
 //////////////////////////////////////////////
 //         String
 
+internal u64 c_str_len(char* s);
+
 // NOTE(PS): even though this has a len and cap, it should always be
 // null terminated
 typedef struct String String;
@@ -296,4 +298,22 @@ dw_put_str(Data_Writer* w, String str)
   {
     dw_put_u8(w, str.str[i]);
   }
+}
+
+internal void
+dw_put_str_min_len(Data_Writer* w, String str, u64 min_len)
+{
+  u64 start = w->at;
+  dw_put_str(w, str);
+  if (str.len < min_len)
+  {
+    w->at = start + min_len;
+  }
+}
+
+internal void
+dw_put_str_min_len_nullterm(Data_Writer* w, String str, u64 min_len)
+{
+  dw_put_str_min_len(w, str, min_len);
+  w->data.base[w->at - 1] = '\0';
 }
\ No newline at end of file
diff --git a/src_v2/engine/lumenarium_engine.c b/src_v2/engine/lumenarium_engine.c
index 747a923..9892dc6 100644
--- a/src_v2/engine/lumenarium_engine.c
+++ b/src_v2/engine/lumenarium_engine.c
@@ -7,9 +7,9 @@ en_init(App_State* state, App_Init_Desc desc)
   state->assemblies = assembly_array_create(permanent, desc.assembly_cap);
   
   Output* o = &state->output;
-  register_output_method(o, OutputData_Invalid, 0, 0);
-  register_output_method(o, OutputData_NetworkSACN, output_network_sacn_build, output_network_sacn_init());
-  register_output_method(o, OutputData_ComUART, output_network_sacn_build, output_com_uart_init());
+  register_output_method(o, OutputData_Invalid, 0, 0, 0);
+  register_output_method(o, OutputData_NetworkSACN, output_network_sacn_update, output_network_sacn_build, output_network_sacn_init());
+  register_output_method(o, OutputData_ComUART, 0, output_network_sacn_build, output_com_uart_init());
   
   lumenarium_env_validate();
 }
@@ -50,28 +50,38 @@ en_frame(App_State* state)
   
   ///////////////////////////////////////
   // Output Data
-  
+  Output_Methods methods = state->output.methods;
+
+  // update each method that has an update method
+  for (u32 i = 0; i < OutputData_Count; i++)
+  {
+    if (methods.update_procs[i] == 0) continue;
+    methods.update_procs[i](methods.method_data[i]);
+  }
+
   Output_Data_Queue output_queue = {};
   output_queue.a = scratch.a;
   
   // build output data buffers
-  Output_Methods methods = state->output.methods;
   for (u32 i = 0; i < assemblies.len; i++)
   {
     Assembly_Strip_Array strips = assemblies.strip_arrays[i];
+    Assembly_Pixel_Buffer* pixels = assemblies.pixel_buffers + i;
     for (u32 j = 0; j < strips.len; j++)
     {
       Assembly_Strip* strip = strips.strips + j;
       Build_Output_Data_Buffer* method_proc = methods.procs[strip->output_kind];
       u8* method_data = methods.method_data[strip->output_kind];
       if (method_proc == 0) continue;
-      method_proc(state, i, strip, method_data, &output_queue);
+      method_proc(state, i, pixels, strip, method_data, &output_queue);
     }
   }
   
   // output the buffers
   // TODO(PS): we could sort these first if switchig between output 
   // types is time consuming
+  
+  Sacn* sacn = (Sacn*)state->output.methods.method_data[OutputData_NetworkSACN];
   for (Output_Data* at = output_queue.first; at != 0; at = at->next)
   {
     // NOTE(PS): we can overload each switch case as more methods come in
@@ -82,7 +92,13 @@ en_frame(App_State* state)
     {
       case OutputData_NetworkSACN:
       {
-        // TODO(PS): platform network io
+        os_socket_send_to(
+          sacn->socket,
+          at->network.v4_addr,
+          at->network.port,
+          at->data,
+          0
+        );
       } break;
       
       case OutputData_ComUART:
diff --git a/src_v2/engine/lumenarium_engine_output.c b/src_v2/engine/lumenarium_engine_output.c
index 92c23ad..d295d19 100644
--- a/src_v2/engine/lumenarium_engine_output.c
+++ b/src_v2/engine/lumenarium_engine_output.c
@@ -1,7 +1,8 @@
 
 internal void
-register_output_method(Output* output, Output_Data_Kind kind, Build_Output_Data_Buffer* proc, u8* method_data)
+register_output_method(Output* output, Output_Data_Kind kind, Output_Method_Update* update, Build_Output_Data_Buffer* proc, u8* method_data)
 {
+  output->methods.update_procs[kind] = update;
   output->methods.procs[kind] = proc;
   output->methods.method_data[kind] = method_data;
 }
@@ -13,6 +14,7 @@ output_data_queue_push(Output_Data_Queue* q, u32 size, Output_Data_Kind kind)
   d->kind = kind;
   d->data.size = size;
   d->data.base = allocator_alloc(q->a, size);
+  sll_push(q->first, q->last, d);
   return d;
 }
 
diff --git a/src_v2/engine/lumenarium_engine_output.h b/src_v2/engine/lumenarium_engine_output.h
index 3d3ff56..027ce26 100644
--- a/src_v2/engine/lumenarium_engine_output.h
+++ b/src_v2/engine/lumenarium_engine_output.h
@@ -49,11 +49,13 @@ struct Output_Data_Queue
   Allocator* a;
 };
 
-typedef void Build_Output_Data_Buffer(App_State* state, u32 assembly_id, Assembly_Strip* strip, u8* method_data, Output_Data_Queue* queue);
+typedef void Output_Method_Update(u8* method_data);
+typedef void Build_Output_Data_Buffer(App_State* state, u32 assembly_id, Assembly_Pixel_Buffer* pixels, Assembly_Strip* strip, u8* method_data, Output_Data_Queue* queue);
 
 typedef struct Output_Methods Output_Methods;
 struct Output_Methods
 {
+  Output_Method_Update* update_procs[OutputData_Count];
   Build_Output_Data_Buffer* procs[OutputData_Count];
   u8* method_data[OutputData_Count];
 };
@@ -64,7 +66,7 @@ struct Output
   Output_Methods methods;
 };
 
-internal void register_output_method(Output* output, Output_Data_Kind kind, Build_Output_Data_Buffer* proc, u8* method_data);
+internal void register_output_method(Output* output, Output_Data_Kind kind, Output_Method_Update* update, Build_Output_Data_Buffer* proc, u8* method_data);
 
 internal Output_Data* output_data_queue_push(Output_Data_Queue* q, u32 size, Output_Data_Kind kind);
 
diff --git a/src_v2/engine/output/lumenarium_output_sacn.c b/src_v2/engine/output/lumenarium_output_sacn.c
index ada76ca..fd46365 100644
--- a/src_v2/engine/output/lumenarium_output_sacn.c
+++ b/src_v2/engine/output/lumenarium_output_sacn.c
@@ -1,5 +1,6 @@
 #define SACN_DEFAULT_PORT 5568
 
+#define SACN_STARTCODE_DMX 0
 
 // a description of the address space being used
 #define SACN_PREAMBLE_SIZE_ADDR 0
@@ -59,13 +60,12 @@ internal void
 sacn_vhd_pack_flags(Data_Writer* w, b8 inherit_vec, b8 inherit_head, b8 inherit_data)
 {
   u8 last_byte = dw_get_u8(w) & 0x8F;
-  w->at -= 1;
   
   if (!inherit_vec)  { last_byte |= SACN_VHD_V_FLAG; }
   if (!inherit_head) { last_byte |= SACN_VHD_H_FLAG; }
   if (!inherit_data) { last_byte |= SACN_VHD_D_FLAG; }
   
-  dw_put_u8(w, last_byte);
+  w->data.base[w->at] = last_byte;
 }
 
 internal void
@@ -86,7 +86,6 @@ sacn_vhd_pack_len(Data_Writer* w, u32 len, b8 include_len)
   
   // Mask out the length bits to keep flags intact
   u8 last_byte = dw_get_u8(w) & 0x70;
-  w->at -= 1;
   
   if (len_adjusted > SACN_VHD_MAXMINLENGTH) last_byte |= SACN_VHD_L_FLAG;
   
@@ -105,14 +104,230 @@ sacn_vhd_pack_len(Data_Writer* w, u32 len, b8 include_len)
   }
 }
 
+#define CopyMemoryTo(from, to, size) CopyMemory_((u8*)(from), (u8*)(to), (size))
+internal void
+CopyMemory_(u8* From, u8* To, u64 Size)
+{
+  for (u64 i = 0; i < Size; i++)
+  {
+    To[i] = From[i];
+  }
+}
+
+// Packs a u8 to a known big endian buffer
+u8*
+PackB1(u8* ptr, u8 val)
+{
+	*ptr = val;
+    return ptr + sizeof(val);
+}
+
+//Unpacks a u8 from a known big endian buffer
+u8
+UpackB1(const u8* ptr)
+{
+	return *ptr;
+}
+
+//Packs a u8 to a known little endian buffer
+u8*
+PackL1(u8* ptr, u8 val)
+{
+	*ptr = val;
+    return ptr + sizeof(val);
+}
+
+//Unpacks a u8 from a known little endian buffer
+u8
+UpackL1(const u8* ptr)
+{
+	return *ptr;
+}
+
+u8*
+PackB2(u8* ptr, u16 val)
+{
+    ptr[1] = (u8)(val & 0xff);
+	ptr[0] = (u8)((val & 0xff00) >> 8);
+    return ptr + sizeof(val);
+}
+
+//Unpacks a u16 from a known big endian buffer
+u16
+UpackB2(const u8* ptr)
+{
+	return (u16)(ptr[1] | ptr[0] << 8);
+}
+
+//Packs a u32 to a known big endian buffer
+u8*
+PackB4(u8* ptr, u32 val)
+{
+	ptr[3] = (u8) (val & 0xff);
+	ptr[2] = (u8)((val & 0xff00) >> 8);
+	ptr[1] = (u8)((val & 0xff0000) >> 16);
+	ptr[0] = (u8)((val & 0xff000000) >> 24);
+    return ptr + sizeof(val);
+}
+
+internal void
+VHD_PackFlags_(u8* Buffer, b32 InheritVec, b32 InheritHead, b32 InheritData)
+{
+  u8* Cursor = Buffer;
+  u8 NewByte = UpackB1(Cursor) & 0x8f;
+  
+  if (!InheritVec) { NewByte |= SACN_VHD_V_FLAG; }
+  if (!InheritHead) { NewByte |= SACN_VHD_H_FLAG; }
+  if (!InheritData) { NewByte |= SACN_VHD_D_FLAG; }
+  
+  PackB1(Cursor, NewByte);
+}
+
+internal u8*
+VHD_PackLength_(u8* Buffer, u32 Length, b32 IncludeLength)
+{
+  u8* Cursor = Buffer;
+  u32 AdjustedLength = Length;
+  if (IncludeLength)
+  {
+    if (Length + 1 > SACN_VHD_MAXMINLENGTH)
+    {
+      AdjustedLength += 2;
+    }
+    else
+    {
+      AdjustedLength += 1;
+    }
+  }
+  
+  // Mask out the length bits to keep flags intact
+  u8 NewByte = UpackB1(Cursor) & 0x70;
+  if (AdjustedLength > SACN_VHD_MAXMINLENGTH)
+  {
+    NewByte |= SACN_VHD_L_FLAG;
+  }
+  
+  u8 PackBuffer[4];
+  PackB4(PackBuffer, AdjustedLength);
+  if (AdjustedLength <= SACN_VHD_MAXMINLENGTH)
+  {
+    NewByte |= (PackBuffer[2] & 0x0f);
+    Cursor = PackB1(Cursor, NewByte);
+    Cursor = PackB1(Cursor, PackBuffer[3]);
+  }
+  else
+  {
+    NewByte |= (PackBuffer[1] & 0x0f);
+    Cursor = PackB1(Cursor, PackBuffer[2]);
+    Cursor = PackB1(Cursor, PackBuffer[3]);
+  }
+  
+  return Cursor;
+}
+
+internal void
+InitStreamHeader (u8* Buffer, s32 BufferSize,
+                  u16 SlotCount,
+                  u8 StartCode,
+                  u16 Universe,
+                  u8 Priority,
+                  u16 Reserved,
+                  u8 Options,
+                  const char* SourceName,
+                  Sacn_Cid CID
+                  )
+{
+  // TODO(pjs): Replace packing with gs_memory_cursor
+  
+  u8* Cursor = Buffer;
+  
+  // Preamble Size
+  Cursor = PackB2(Cursor, SACN_RLP_PREAMBLE_SIZE);
+  Cursor = PackB2(Cursor, SACN_RLP_POSTAMBLE_SIZE);
+  
+  CopyMemoryTo(SACN_ACN_IDENTIFIER.str, Cursor, SACN_ACN_IDENTIFIER_SIZE);
+  Cursor += SACN_ACN_IDENTIFIER_SIZE;
+  
+  // TODO(Peter): If you never use this anywhere else, go back and remove the parameters
+  VHD_PackFlags_(Cursor, false, false, false);
+  Cursor = VHD_PackLength_(Cursor,
+                           SACN_BUFFER_HEADER_SIZE - SACN_RLP_PREAMBLE_SIZE + SlotCount,
+                           false);
+  
+  // root vector
+  Cursor = PackB4(Cursor, SACN_ROOT_VECTOR); // 22
+  
+  // CID Pack
+  for (s32 i = 0; i < SACN_CID_BYTES; i++)
+  {
+    *Cursor++ = CID.bytes[i];
+  }// 38
+  
+  VHD_PackFlags_(Cursor, false, false, false);
+  Cursor = VHD_PackLength_(Cursor,
+                           SACN_BUFFER_HEADER_SIZE - SACN_FRAMING_FLAGS_AND_LEN_ADDR + SlotCount,
+                           false);
+  // 40
+  // framing vector
+  Cursor = PackB4(Cursor, SACN_FRAMING_VECTOR);
+  
+  // framing source name
+  // :Check
+  
+  CopyMemoryTo(SourceName, (char*)Cursor, c_str_len((char*)SourceName));
+  Cursor[SACN_SOURCE_NAME_SIZE - 1] = '\0';
+  Cursor += SACN_SOURCE_NAME_SIZE; // 108
+  
+  // priority
+  Cursor = PackB1(Cursor, Priority);
+  
+  // reserved
+  Cursor = PackB2(Cursor, Reserved); // 111
+  
+  // Sequence # is always set to 0/NONE at the beginning, but it is incremented when sending data
+  Cursor = PackB1(Cursor, 0);
+  
+  // Options
+  Cursor = PackB1(Cursor, Options);
+  
+  // Universe
+  Cursor = PackB2(Cursor, Universe); // 115
+  
+  VHD_PackFlags_(Cursor, false, false, false);
+  Cursor = VHD_PackLength_(Cursor,
+                           SACN_BUFFER_HEADER_SIZE - SACN_DMP_FLAGS_AND_LEN_ADDR + SlotCount,
+                           false); // 117
+  
+  // DMP Vector
+  Cursor = PackB1(Cursor, SACN_DMP_VECTOR);
+  
+  // DMP Address and data type
+  Cursor = PackB1(Cursor, SACN_ADDRESS_AND_DATA_FORMAT);
+  
+  // DMP first property address
+  Cursor = PackB1(Cursor, 0);
+  
+  // DMP Address Increment
+  Cursor = PackB1(Cursor, SACN_ADDR_INC);
+  
+  // Property Value Count -- Includes one byte for start code
+  Cursor = PackB2(Cursor, SlotCount + 1);
+  
+  Cursor = PackB1(Cursor, StartCode);
+  
+  assert(Cursor - Buffer == SACN_BUFFER_HEADER_SIZE);
+  
+}
+
 internal void
 sacn_fill_buffer_header(Output_Data* d, u16 universe, Sacn* sacn)
 {
   assert(d && d->data.size > 0);
   
   // TODO(PS): these should be passed in?
-  u16 slot_count = 0; 
-  u8 start_code = 0;
+  u16 slot_count = SACN_BUFFER_BODY_SIZE; 
+  u8 start_code = SACN_STARTCODE_DMX;
+  // universe
   u8 priority = 0;
   u16 reserved = 0;
   u8 options = 0;
@@ -122,7 +337,7 @@ sacn_fill_buffer_header(Output_Data* d, u16 universe, Sacn* sacn)
   
   dw_put_u16_b(&w, SACN_RLP_PREAMBLE_SIZE);
   dw_put_u16_b(&w, SACN_RLP_POSTAMBLE_SIZE);
-  dw_put_str(&w, SACN_ACN_IDENTIFIER);
+  dw_put_str_min_len(&w, SACN_ACN_IDENTIFIER, SACN_ACN_IDENTIFIER_SIZE);
   
   sacn_vhd_pack_flags(&w, false, false, false);
   sacn_vhd_pack_len(&w, SACN_BUFFER_HEADER_SIZE - SACN_RLP_PREAMBLE_SIZE + slot_count, false);
@@ -130,16 +345,17 @@ sacn_fill_buffer_header(Output_Data* d, u16 universe, Sacn* sacn)
   dw_put_u32_b(&w, SACN_ROOT_VECTOR);
   
   for (u32 i = 0; i < SACN_CID_BYTES; i++) dw_put_u8(&w, sacn->cid.bytes[i]);
-  
+
   sacn_vhd_pack_flags(&w, false, false, false);
   sacn_vhd_pack_len(&w, SACN_BUFFER_HEADER_SIZE - SACN_FRAMING_FLAGS_AND_LEN_ADDR + slot_count, false);
   
   dw_put_u32_b(&w, SACN_FRAMING_VECTOR);
-  dw_put_str(&w, sacn->source_name);
+
+  dw_put_str_min_len_nullterm(&w, sacn->source_name, SACN_SOURCE_NAME_SIZE);
   
   dw_put_u8(&w, priority);
-  dw_put_u16_b(&w, reserved);
-  dw_put_u8(&w, 0); // Sequence Number starts at 0, gets updated
+  dw_put_u16_b(&w, reserved); // synchronization 
+  dw_put_u8(&w, sacn->sequence_iter);
   dw_put_u8(&w, options);
   dw_put_u16_b(&w, universe);
   
@@ -148,8 +364,8 @@ sacn_fill_buffer_header(Output_Data* d, u16 universe, Sacn* sacn)
   
   dw_put_u8(&w, SACN_DMP_VECTOR);
   dw_put_u8(&w, SACN_ADDRESS_AND_DATA_FORMAT);
-  dw_put_u8(&w, 0); // dmp first priority addr
-  dw_put_u8(&w, SACN_ADDR_INC); // dmp address increment
+  dw_put_u16_b(&w, 0); // dmp first priority addr
+  dw_put_u16_b(&w, SACN_ADDR_INC); // dmp address increment
   dw_put_u16_b(&w, slot_count + 1);
   dw_put_u8(&w, start_code);
   
@@ -157,9 +373,20 @@ sacn_fill_buffer_header(Output_Data* d, u16 universe, Sacn* sacn)
 }
 
 internal void
-sacn_fill_buffer_body(Output_Data* d, u32* leds_placed)
+sacn_fill_buffer_body(Output_Data* d, Assembly_Pixel_Buffer* pixels, Assembly_Strip* strip, u32* leds_placed)
 {
-  
+  u32 first = *leds_placed;
+  u32 to_add = min(strip->pixels_len - first, SACN_BUFFER_BODY_SIZE / 3);
+  u32 one_past_last = first + to_add;
+  for (u32 i = *leds_placed; i < one_past_last; i++)
+  {
+    u32 led_index = strip->pixels[i];
+    Assembly_Pixel color = pixels->pixels[led_index];
+    d->data.base[SACN_BUFFER_HEADER_SIZE + (i * 3) + 0] = color.r;
+    d->data.base[SACN_BUFFER_HEADER_SIZE + (i * 3) + 1] = color.g;
+    d->data.base[SACN_BUFFER_HEADER_SIZE + (i * 3) + 2] = color.b; 
+  }
+  *leds_placed += to_add;
 }
 
 internal Sacn_Cid
@@ -178,16 +405,34 @@ internal u8*
 output_network_sacn_init()
 {
   Sacn* result = allocator_alloc_struct(permanent, Sacn);
-  // TODO(PS): get platform send socket
+  zero_struct(*result);
+
+  result->source_name = string_f(permanent, "lumenarium::incenter");
   
   String cid_str = lit_str("{67F9D986-544E-4abb-8986-D5F79382586C}");
   result->cid = sacn_string_to_cid(cid_str);
-  
+
+  s32 ttl = 20;
+  result->socket = os_socket_create(AF_INET, SOCK_DGRAM, 0);
+  os_socket_set_opt(
+    result->socket, 
+    IPPROTO_IP, 
+    IP_MULTICAST_TTL, 
+    (u8*)&ttl, sizeof(ttl)
+  );
+
   return (u8*)result;
 }
 
 internal void
-output_network_sacn_build(App_State* state, u32 assembly_id, Assembly_Strip* strip, u8* method_data, Output_Data_Queue* queue)
+output_network_sacn_update(u8* method_data)
+{
+  Sacn* sacn = (Sacn*)method_data;
+  sacn->sequence_iter += 1;
+}
+
+internal void
+output_network_sacn_build(App_State* state, u32 assembly_id, Assembly_Pixel_Buffer* pixels, Assembly_Strip* strip, u8* method_data, Output_Data_Queue* queue)
 {
   Sacn* sacn = (Sacn*)method_data;
   
@@ -200,8 +445,9 @@ output_network_sacn_build(App_State* state, u32 assembly_id, Assembly_Strip* str
     Output_Data* d = output_data_queue_push(queue, SACN_BUFFER_SIZE, OutputData_NetworkSACN);
     output_data_set_network_addr(d, v4_send_addr, send_port);
     
+    //InitStreamHeader(d->data.base, d->data.size, SACN_BUFFER_BODY_SIZE, SACN_STARTCODE_DMX, universe, 0, 0, 0, "lumenarium::sacn", sacn->cid);
     sacn_fill_buffer_header(d, universe, sacn);
-    sacn_fill_buffer_body(d, &leds_placed);
+    sacn_fill_buffer_body(d, pixels, strip, &leds_placed);
     universe += 1;
   }
 }
diff --git a/src_v2/engine/output/lumenarium_output_sacn.h b/src_v2/engine/output/lumenarium_output_sacn.h
index 0f762c7..09f96ae 100644
--- a/src_v2/engine/output/lumenarium_output_sacn.h
+++ b/src_v2/engine/output/lumenarium_output_sacn.h
@@ -16,9 +16,11 @@ struct Sacn
   Sacn_Cid cid;
   s32 sequence_iter;
   String source_name;
+  Socket_Handle socket;
 };
 
 internal u8* output_network_sacn_init();
-internal void output_network_sacn_build(App_State* state, u32 assembly_id, Assembly_Strip* strip, u8* method_data, Output_Data_Queue* queue);
+internal void output_network_sacn_update(u8* method_data);
+internal void output_network_sacn_build(App_State* state, u32 assembly_id, Assembly_Pixel_Buffer* pixels, Assembly_Strip* strip, u8* method_data, Output_Data_Queue* queue);
 
 #endif //LUMENARIUM_OUTPUT_SACN_H
diff --git a/src_v2/lumenarium_first.c b/src_v2/lumenarium_first.c
index 5178b03..5249156 100644
--- a/src_v2/lumenarium_first.c
+++ b/src_v2/lumenarium_first.c
@@ -9,7 +9,8 @@ lumenarium_init(Editor_Desc* ed_desc)
   permanent = bump_allocator_create_reserve(GB(2));
   global_scratch_ = bump_allocator_create_reserve(GB(4));
   
-  //run_tests();
+  run_tests();
+  
   scratch_get(scratch);
   App_Init_Desc desc = incenter_get_init_desc();
   // TODO(PS): make sure the values make sense in desc
@@ -20,6 +21,7 @@ lumenarium_init(Editor_Desc* ed_desc)
   add_flag(state->flags, AppState_RunUserSpace);
   
   state->file_async_job_system = os_file_jobs_init();
+  open_sockets_init();
   state->input_state = input_state_create(permanent);
   
   String exe_file_path = os_get_exe_path(scratch.a);
diff --git a/src_v2/lumenarium_first.h b/src_v2/lumenarium_first.h
index 92d2067..16970f1 100644
--- a/src_v2/lumenarium_first.h
+++ b/src_v2/lumenarium_first.h
@@ -17,6 +17,7 @@ global Allocator* global_scratch_; // gets reset at frame boundaries
 
 // Engine
 typedef struct Assembly_Strip Assembly_Strip;
+typedef struct Assembly_Pixel_Buffer Assembly_Pixel_Buffer;
 #include "engine/lumenarium_engine_output.h"
 #include "engine/lumenarium_engine_assembly.h"
 #include "engine/output/lumenarium_output_uart.h"
@@ -48,6 +49,8 @@ lumenarium_env_validate_()
   bump_allocator_validate(permanent);
   bump_allocator_validate(global_scratch_);
   bump_allocator_validate(file_jobs_arena);
+
+  core_socket_tests();
 }
 
 
diff --git a/src_v2/lumenarium_types.h b/src_v2/lumenarium_types.h
index 85e32dc..7937a14 100644
--- a/src_v2/lumenarium_types.h
+++ b/src_v2/lumenarium_types.h
@@ -155,7 +155,7 @@ dw_get_u8(Data_Writer* w)
   u8 result = 0;
   if (w->at < w->data.size)
   {
-    result = w->data.base[w->at++];
+    result = w->data.base[w->at];
   }
   return result;
 }
@@ -227,6 +227,24 @@ dw_put_str(Data_Writer* w, String str)
   }
 }
 
+internal void
+dw_put_str_min_len(Data_Writer* w, String str, u64 min_len)
+{
+  u64 start = w->at;
+  dw_put_str(w, str);
+  if (str->len < min_len)
+  {
+    w->at = start + min_len;
+  }
+}
+
+internal void
+dw_put_str_min_len_nullterm(Data_Writer* w, String str, u64 min_len)
+{
+  dw_put_str_min_len(w, str, min_len);
+  w->data.base[w->at - 1] = '\0';
+}
+
 // TODO(PS): get functions
 
 #define Bytes(x) (x)
diff --git a/src_v2/platform/lumenarium_os.h b/src_v2/platform/lumenarium_os.h
index b83cf91..67e1719 100644
--- a/src_v2/platform/lumenarium_os.h
+++ b/src_v2/platform/lumenarium_os.h
@@ -45,14 +45,17 @@ u32 os_interlocked_cmp_exchg(volatile u32* dest, u32 new_value, u32 old_value);
 ///////////////////////////////////////
 //    Network Access
 
-Socket_Handle os_socket_create();
+Socket_Handle os_socket_create(s32 domain, s32 type, s32 protocol);
 bool          os_socket_bind();
 bool          os_socket_connect();
 bool          os_socket_close();
 Data          os_socket_recv();
-s32           os_Socket_set_listening();
-s32           os_Socket_send();
-s32           os_Socket_send_to();
-s32           os_Socket_set_opt();
+s32           os_socket_set_listening();
+s32           os_socket_send();
+s32           os_socket_send_to(Socket_Handle handle, u32 addr, u32 port, Data data, s32 flags);
+s32           os_socket_set_opt(Socket_Handle handle, int level, int option_name,
+u8* option_value, s32 option_len);
+
+void open_sockets_init();
 
 #endif // LUMENARIUM_OS
\ No newline at end of file
diff --git a/src_v2/platform/osx/lumenarium_first_osx.c b/src_v2/platform/osx/lumenarium_first_osx.c
index 220bc7b..e2cbde7 100644
--- a/src_v2/platform/osx/lumenarium_first_osx.c
+++ b/src_v2/platform/osx/lumenarium_first_osx.c
@@ -8,6 +8,9 @@
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #include <OpenGL/gl.h>
 
+#include <sys/socket.h>
+#include <netinet/in.h>
+
 #include "lumenarium_osx_memory.h"
 #include "../../core/lumenarium_core.h"
 #include "../lumenarium_os.h"
@@ -37,34 +40,15 @@ osx_err_print_(char* proc, char* sub_proc, s32 errsv)
 #define OS_FILE_HANDLE_TYPE s32
 #define OS_FILE_MAX_PATH PATH_MAX
 #define OS_FILE_INVALID_HANDLE -1
+#define OS_SOCKET_TYPE s32
+#define OS_SOCKET_INVALID_HANDLE -1
 #include "../shared/lumenarium_shared_file_tracker.h"
 #include "../shared/lumenarium_shared_file_async_work_on_job.h"
+#include "../shared/lumenarium_shared_network.h"
 #include "lumenarium_osx_file.h"
 #include "lumenarium_osx_time.h"
 #include "lumenarium_osx_graphics.h"
-
-void osx_tests()
-{
-  Ticks t0 = os_get_ticks();
-
-  // File Tests
-  File_Handle file = os_file_open(lit_str("text.txt"), FileAccess_Read | FileAccess_Write, FileCreate_OpenAlways);
-  File_Info info = os_file_get_info(file, global_scratch_);
-  Data d = os_file_read_all(file, global_scratch_);
-  os_file_write_all(file, d);
-  os_file_close(file);
-
-  // Path tests
-  String path_exe = os_get_exe_path(global_scratch_);
-  printf("%.*s\n", str_varg(path_exe));
-  String path = string_chop_last_slash(path_exe);
-  String path0 = string_copy(path, global_scratch_);
-  os_pwd_set(path0);
-
-  Ticks t1 = os_get_ticks();
-  Ticks td = get_ticks_elapsed(t0, t1);
-  r64 sd = ticks_to_seconds(td, os_get_ticks_per_second());
-}
+#include "lumenarium_osx_network.h"
 
 void 
 glfw_error_callback(int error, const char* description)
@@ -279,9 +263,7 @@ scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
 }
 
 int main (int arg_count, char** args)
-{
-  // osx_tests();
-  
+{  
   if (!glfwInit())
   {
     printf("Error: Could not initialize glfw.\n");
diff --git a/src_v2/platform/osx/lumenarium_osx_network.h b/src_v2/platform/osx/lumenarium_osx_network.h
new file mode 100644
index 0000000..983efda
--- /dev/null
+++ b/src_v2/platform/osx/lumenarium_osx_network.h
@@ -0,0 +1,86 @@
+Socket_Handle 
+os_socket_create(s32 domain, s32 type, s32 protocol)
+{
+  Socket_Handle result = {};
+  OS_SOCKET_TYPE sock = socket(domain, type, protocol);
+  if (sock == -1) {
+    perror("Error: os_socket_create\n");
+    return result;
+  }
+
+  result = open_sockets_put(sock);
+  if (result.value == 0)
+  {
+    fprintf(stderr, "Error: os_socket_create - not enough room in open_sockets\n");
+  }
+  return result;
+}
+
+bool          
+os_socket_bind()
+{
+  return false;
+}
+
+bool          
+os_socket_connect()
+{
+  return false;
+}
+
+bool          
+os_socket_close()
+{
+  return false;
+}
+
+Data          
+os_socket_recv()
+{
+  return (Data){};
+}
+
+s32           
+os_socket_set_listening()
+{
+  return 0;
+}
+
+s32           
+os_socket_send()
+{
+  return 0;
+}
+
+s32           
+os_socket_send_to(Socket_Handle handle, u32 addr, u32 port, Data data, s32 flags)
+{
+  OS_SOCKET_TYPE sock = open_sockets_get(handle);
+
+  struct sockaddr_in dst = {
+    .sin_family = AF_INET,
+    .sin_port = hton_u16(port),
+    .sin_addr.s_addr = hton_u32(addr),
+  };
+  struct sockaddr* dst_ptr = (struct sockaddr*)&dst;
+  s32 len_sent = sendto(sock, data.base, data.size, flags, dst_ptr, sizeof(struct sockaddr_in));
+  if (len_sent == -1)
+  {
+    perror("Error: os_socket_send_to\n");
+    return 0;
+  }
+
+  return len_sent;
+}
+
+s32           
+os_socket_set_opt(Socket_Handle handle, int level, int option_name,
+u8* option_value, s32 option_len)
+{
+  OS_SOCKET_TYPE sock = open_sockets_get(handle);
+  s32 err = setsockopt(sock, level, option_name, (void*)option_value, (socklen_t)option_len);
+  if (err) {
+    fprintf(stderr, "Error: setsockopt - %d\n\targs: %d %d %.*s\n", err, level, option_name, option_len, (char*)option_value);
+  }
+  return 0;
+}
diff --git a/src_v2/platform/shared/lumenarium_shared_network.h b/src_v2/platform/shared/lumenarium_shared_network.h
new file mode 100644
index 0000000..d4d1986
--- /dev/null
+++ b/src_v2/platform/shared/lumenarium_shared_network.h
@@ -0,0 +1,67 @@
+#if !defined(OS_SOCKET_TYPE)
+#  error "You must define an OS_SOCKET_TYPE"
+#endif
+
+#if !defined(OS_SOCKET_INVALID_HANDLE)
+#  error "You must define an OS_SOCKET_INVALID_HANDLE"
+#endif
+
+#define               open_sockets_cap   2
+global u32            open_sockets_len = 1;
+global OS_SOCKET_TYPE open_sockets[open_sockets_cap];
+
+void           open_sockets_init();
+s32            open_sockets_next_free();
+bool           open_sockets_has_room();
+OS_SOCKET_TYPE open_sockets_get(Socket_Handle handle);
+Socket_Handle  open_sockets_put(OS_SOCKET_TYPE socket);
+void           open_sockets_rem(Socket_Handle handle);
+
+////////////////////////////////////////////////
+// IMPLEMENTATION
+
+void           
+open_sockets_init()
+{
+  for (u32 i = 0; i < open_sockets_cap; i++) 
+  {
+    open_sockets[i] = OS_SOCKET_INVALID_HANDLE;
+  }
+}
+
+s32        
+open_sockets_next_free()
+{
+  if (open_sockets_len < open_sockets_cap) return open_sockets_len++;
+  for (u32 i = 1; i < open_sockets_len; i++)
+  {
+    if (open_sockets[i] == OS_SOCKET_INVALID_HANDLE) return i;
+  }
+  return 0;
+}
+
+OS_SOCKET_TYPE 
+open_sockets_get(Socket_Handle handle)
+{
+  assert(handle.value < open_sockets_len);
+  return open_sockets[handle.value];
+}
+
+Socket_Handle  
+open_sockets_put(OS_SOCKET_TYPE socket)
+{
+  Socket_Handle result = { .value = open_sockets_next_free() };
+  assert(result.value != 0);
+  open_sockets[result.value] = socket;
+  return result;
+}
+
+void           
+open_sockets_rem(Socket_Handle handle)
+{
+  assert(handle.value < open_sockets_len);
+  open_sockets[handle.value] = OS_SOCKET_INVALID_HANDLE;
+  if (handle.value + 1 == open_sockets_len) {
+    open_sockets_len -= 1;
+  }
+}
diff --git a/src_v2/user_space/user_space_incenter.cpp b/src_v2/user_space/user_space_incenter.cpp
index 876fbe5..3f28c9e 100644
--- a/src_v2/user_space/user_space_incenter.cpp
+++ b/src_v2/user_space/user_space_incenter.cpp
@@ -40,6 +40,8 @@ incenter_init(App_State* state)
   for (u32 i = 0; i < 40; i++)
   {
     Assembly_Strip* strip = assembly_add_strip(&state->assemblies, ah, 123);
+    strip->output_kind = OutputData_NetworkSACN;
+    strip->sacn_universe = i;
     
     r32 theta = random_series_next_unilateral(&rand) * r32_tau;
     r32 phi   = random_series_next_unilateral(&rand) * r32_tau;