diff --git a/plugin.lua b/plugin.lua
index d8f20ab..9719555 100644
--- a/plugin.lua
+++ b/plugin.lua
@@ -28,11 +28,18 @@ function dp.reset_rds() end
 ---@return nil
 function dp.force_save() end
 
+---Set the program which is actually being modulated. Setting this does not affect the writing program
 ---@param program_idx integer 0 to (max_programs - 1)
 function dp.set_program(program_idx) end
 ---@return integer
 function dp.get_program() end
 
+---Sets the program all of the set/get functions affect
+---@param program_idx integer 0 to (max_programs - 1)
+function dp.set_writing_program(program_idx) end
+---@return integer
+function dp.get_writing_program() end
+
 ---This function is called by the C core after we reset data, or have no data in general
 ---It should be defined by the user in the script.
 ---@return nil
diff --git a/scripts/99-data.lua b/scripts/99-data.lua
index fd89666..7e9cdae 100644
--- a/scripts/99-data.lua
+++ b/scripts/99-data.lua
@@ -1,4 +1,113 @@
+local mec_handlers = {}
+
+local function dsn_helper(dsn, write)
+    if dsn == 0 then write()
+    elseif dsn == 254 then
+        local start = dp.get_writing_program()
+        for i = 1, dp.max_programs do
+            local p = i - 1
+            if p ~= start then
+                dp.set_writing_program(p)
+                write()
+            end
+        end
+    elseif dsn == 255 then
+        for i = 1, dp.max_programs do
+            dp.set_writing_program(i - 1)
+            write()
+        end
+    else
+        dp.set_writing_program(dsn - 1)
+        write()
+    end
+end
+
+mec_handlers[1] = function (data)
+    -- PI
+    local dsn = string.byte(data, 2)
+    local psn = string.byte(data, 3)
+    local pi_msb = string.byte(data, 4)
+    local pi_lsb = string.byte(data, 5)
+
+    dsn_helper(dsn, function ()
+        rds.set_pi((pi_msb << 8) | pi_lsb)
+    end)
+end
+mec_handlers[2] = function (data)
+    -- PS
+    local dsn = string.byte(data, 2)
+    local psn = string.byte(data, 3)
+    local ps = string.sub(data, 4, 11)
+    dsn_helper(dsn, function ()
+        rds.set_ps(ps)
+    end)
+end
+mec_handlers[3] = function (data)
+    -- TP/TA
+    local dsn = string.byte(data, 2)
+    local psn = string.byte(data, 3)
+    local data = string.byte(data, 4)
+    dsn_helper(dsn, function ()
+        rds.set_ta((data & 1) ~= 0)
+        rds.set_ta((data & 2) ~= 0)
+    end)
+end
+
+---@param data string
+local function undo_byte_stuff(data)
+    local output = {}
+    local i = 1
+    while i <= #data do
+        local d0 = string.byte(data, i)
+        if d0 == 0xFD then
+            local d1 = string.byte(data, i + 1)
+            output[#output + 1] = string.char(0xFD + d1)
+            i = i + 2
+        else
+            output[#output + 1] = string.char(d0)
+            i = i + 1
+        end
+    end
+    return table.concat(output)
+end
+
+---@param packet string
+local function parse_uecp(packet)
+    local end_i = string.find(packet, "\xff", 1, true)
+    if not end_i then return end
+
+    local unstuffed = undo_byte_stuff(string.sub(packet, 2, end_i - 1))
+
+    local addr1 = string.byte(unstuffed, 1)
+    local addr2 = string.byte(unstuffed, 2)
+    local site_addr = (addr1 << 2) | (addr2 >> 6)
+    local encoder_addr = addr2 & 0x3F
+    local sequence_count = string.byte(unstuffed, 3)
+    local mfl = string.byte(unstuffed, 4)
+
+    local data = string.sub(unstuffed, 5, 4 + mfl)
+
+    if mfl ~= #data then return end
+
+    local crc_calculated = dp.crc16(string.sub(unstuffed, 1, 4 + mfl))
+    local crc_hi = string.byte(unstuffed, 4 + mfl + 1)
+    local crc_lo = string.byte(unstuffed, 4 + mfl + 2)
+    local crc_stored = (crc_hi << 8) | crc_lo
+
+    if crc_calculated ~= crc_stored then return end
+
+    local mec = string.byte(data, 1)
+    local handler = mec_handlers[mec]
+    if handler then 
+        handler(data)
+        dp.set_writing_program(dp.get_program())
+    end
+end
+
 function data_handle(data)
+    -- UECP
+    if string.byte(data, 1) == 0xfe then return parse_uecp(data) end
+
     if string.sub(data, 1, 4):lower() == "lua=" then
         local chunk, err = load("return " .. string.sub(data, 5), "udp_chunk")  -- skip "lua="
         if not chunk then return string.format("-\r\n%s\r\n", err) end
@@ -212,11 +321,6 @@ function data_handle(data)
         if not pty then return "-\r\n" end
         rds.set_pty(pty)
         return "+\r\n"
-    elseif cmd == "slcd" then
-        local slc_data = tonumber(value, 16)
-        if not slc_data then return "-\r\n" end
-        rds.set_slc_data(slc_data)
-        return "+\r\n"
     elseif cmd == "ct" then
         local ct = tonumber(value)
         if not ct then return "-\r\n" end
@@ -303,6 +407,7 @@ function data_handle(data)
         if not program then return "-\r\n" end
         if program < 1 or program > dp.max_programs then return "-\r\n" end
         dp.set_program(program-1)
+        dp.set_writing_program(program-1)
         rds.set_ta(false)
         return "+\r\n"
     elseif cmd == "dttmout" then
diff --git a/src/lua_api.c b/src/lua_api.c
index 3c6498f..d713790 100644
--- a/src/lua_api.c
+++ b/src/lua_api.c
@@ -6,24 +6,25 @@ static int in_set_defaults = 0;
 extern lua_State *L;
 extern RDSEncoder* enc;
 extern uint8_t unload_refs[33];
+static int writing_program = 0;
 
 int lua_get_userdata(lua_State *localL) {
-    lua_pushlstring(localL, (const char*)&enc->data[enc->program].lua_data, LUA_USER_DATA);
+    lua_pushlstring(localL, (const char*)&enc->data[writing_program].lua_data, LUA_USER_DATA);
     return 1;
 }
 int lua_get_userdata_offset(lua_State *localL) {
     uint16_t offset = luaL_checkinteger(localL, 1);
     uint16_t size = luaL_checkinteger(localL, 2);
     if((offset+size) > LUA_USER_DATA) return luaL_error(localL, "data exceeds limit");
-    lua_pushlstring(localL, (const char*)&enc->data[enc->program].lua_data[offset], size);
+    lua_pushlstring(localL, (const char*)&enc->data[writing_program].lua_data[offset], size);
     return 1;
 }
 int lua_set_userdata(lua_State *localL) {
     size_t len;
     const char *data = luaL_checklstring(localL, 1, &len);
     if(len > LUA_USER_DATA) return luaL_error(localL, "data exceeds limit");
-    memset(enc->data[enc->program].lua_data, 0, LUA_USER_DATA);
-    memcpy(enc->data[enc->program].lua_data, data, len);
+    memset(enc->data[writing_program].lua_data, 0, LUA_USER_DATA);
+    memcpy(enc->data[writing_program].lua_data, data, len);
 
     return 0;
 }
@@ -34,8 +35,8 @@ int lua_set_userdata_offset(lua_State *localL) {
     size_t len;
     const char *data = luaL_checklstring(localL, 3, &len);
     if(len > size || (offset + size) > LUA_USER_DATA) return luaL_error(localL, "data exceeds limit");
-    memset(enc->data[enc->program].lua_data + offset, 0, size);
-    memcpy(enc->data[enc->program].lua_data + offset, data, len);
+    memset(enc->data[writing_program].lua_data + offset, 0, size);
+    memcpy(enc->data[writing_program].lua_data + offset, data, len);
 
     return 0;
 }
@@ -55,7 +56,7 @@ int lua_set_rds_program_defaults(lua_State *localL) {
     in_set_defaults = 1;
     for (int i = 1; i < *unload_refs; i++) luaL_unref(L, LUA_REGISTRYINDEX, unload_refs[i]);
     unload_refs[0] = 1;
-    set_rds_defaults(enc, enc->program);
+    set_rds_defaults(enc, writing_program);
     lua_call_tfunction_nolock("on_init");
     lua_call_tfunction_nolock("on_state");
     in_set_defaults = 0;
@@ -77,24 +78,24 @@ int lua_reset_rds(lua_State *localL) {
 #define BOOL_SETTER(name) \
 int lua_set_rds_##name(lua_State *localL) { \
     if (!lua_isboolean(localL, 1)) return luaL_error(localL, "boolean expected, got %s", luaL_typename(localL, 1)); \
-	enc->data[enc->program].name = lua_toboolean(localL, 1); \
+	enc->data[writing_program].name = lua_toboolean(localL, 1); \
     return 0; \
 }
 #define INT_SETTER(name) \
 int lua_set_rds_##name(lua_State *localL) { \
-	enc->data[enc->program].name = luaL_checkinteger(localL, 1); \
+	enc->data[writing_program].name = luaL_checkinteger(localL, 1); \
     return 0; \
 }
 #define STR_SETTER(name, function) \
 int lua_set_rds_##name(lua_State *localL) { \
 	const char* str = luaL_checklstring(localL, 1, NULL); \
-    function(enc, convert_to_rdscharset(str)); \
+    function(enc, convert_to_rdscharset(str), writing_program); \
     return 0; \
 }
 #define STR_RAW_SETTER(name, function) \
 int lua_set_rds_##name(lua_State *localL) { \
 	const char* str = luaL_checklstring(localL, 1, NULL); \
-    function(enc, str); \
+    function(enc, str, writing_program); \
     return 0; \
 }
 #define AF_SETTER(name, af_field, af_struct, add_func) \
@@ -103,7 +104,7 @@ int lua_set_rds_##name(lua_State *localL) { \
     \
     int n = lua_rawlen(localL, 1); \
     if (n == 0) { \
-        memset(&(enc->data[enc->program].af_field), 0, sizeof(af_struct)); \
+        memset(&(enc->data[writing_program].af_field), 0, sizeof(af_struct)); \
         return 0; \
     } \
     if(n > 25) return luaL_error(localL, "table length over 25"); \
@@ -117,24 +118,24 @@ int lua_set_rds_##name(lua_State *localL) { \
         else return luaL_error(localL, "number expected, got %s", luaL_typename(localL, -1)); \
         lua_pop(localL, 1); \
     } \
-	memcpy(&(enc->data[enc->program].af_field), &new_af, sizeof(new_af)); \
+	memcpy(&(enc->data[writing_program].af_field), &new_af, sizeof(new_af)); \
     \
     return 0; \
 }
 
 #define INT_GETTER(name) \
 int lua_get_rds_##name(lua_State *localL) { \
-    lua_pushinteger(localL, enc->data[enc->program].name); \
+    lua_pushinteger(localL, enc->data[writing_program].name); \
     return 1; \
 }
 #define BOOL_GETTER(name) \
 int lua_get_rds_##name(lua_State *localL) { \
-    lua_pushboolean(localL, enc->data[enc->program].name); \
+    lua_pushboolean(localL, enc->data[writing_program].name); \
     return 1; \
 }
 #define STR_RAW_GETTER(name, length) \
 int lua_get_rds_##name(lua_State *localL) { \
-    lua_pushlstring(localL, enc->data[enc->program].name, length); \
+    lua_pushlstring(localL, enc->data[writing_program].name, length); \
     return 1; \
 }
 INT_SETTER(pi)
@@ -195,12 +196,12 @@ int lua_get_rds_streams(lua_State *localL) {
 
 int lua_set_rds_link(lua_State *localL) {
     if (!lua_isboolean(localL, 1)) return luaL_error(localL, "boolean expected, got %s", luaL_typename(localL, 1));
-	enc->state[enc->program].eon_linkage = lua_toboolean(localL, 1);
+	enc->state[writing_program].eon_linkage = lua_toboolean(localL, 1);
     return 0;
 }
 
 int lua_get_rds_link(lua_State *localL) {
-    lua_pushboolean(localL, enc->state[enc->program].eon_linkage);
+    lua_pushboolean(localL, enc->state[writing_program].eon_linkage);
     return 1;
 }
 
@@ -214,6 +215,7 @@ int lua_set_rds_program(lua_State *localL) {
     enc->data[enc->program].ta = 0;
 	enc->data[(uint8_t)program].ta = 0;
 	enc->program = (uint8_t)program;
+    writing_program = program;
     return 0;
 }
 
@@ -222,34 +224,48 @@ int lua_get_rds_program(lua_State *localL) {
     return 1;
 }
 
+int lua_set_rds_writing_program(lua_State *localL) {
+    int program = luaL_checkinteger(localL, 1);
+    if(program >= PROGRAMS) program = (PROGRAMS-1);
+	if(program < 0) program = 0;
+
+    writing_program = program;
+    return 0;
+}
+
+int lua_get_rds_writing_program(lua_State *localL) {
+    lua_pushinteger(localL, writing_program);
+    return 1;
+}
+
 int lua_set_rds_rt_switching_period(lua_State *localL) {
-	enc->data[enc->program].rt_switching_period = luaL_checkinteger(localL, 1);
-	enc->state[enc->program].rt_switching_period_state = enc->data[enc->program].rt_switching_period;
+	enc->data[writing_program].rt_switching_period = luaL_checkinteger(localL, 1);
+	enc->state[writing_program].rt_switching_period_state = enc->data[writing_program].rt_switching_period;
     return 0;
 }
 INT_GETTER(rt_switching_period)
 
 int lua_set_rds_rt_text_timeout(lua_State *localL) {
-	enc->data[enc->program].rt_text_timeout = luaL_checkinteger(localL, 1);
-	enc->state[enc->program].rt_text_timeout_state = enc->data[enc->program].rt_text_timeout;
+	enc->data[writing_program].rt_text_timeout = luaL_checkinteger(localL, 1);
+	enc->state[writing_program].rt_text_timeout_state = enc->data[writing_program].rt_text_timeout;
     return 0;
 }
 INT_GETTER(rt_text_timeout)
 
 int lua_put_rds_custom_group(lua_State *localL) {
-	enc->state[enc->program].custom_group[0] = 1;
-	enc->state[enc->program].custom_group[1] = luaL_checkinteger(localL, 1);
-	enc->state[enc->program].custom_group[2] = luaL_checkinteger(localL, 2);
-	enc->state[enc->program].custom_group[3] = luaL_checkinteger(localL, 3);
+	enc->state[writing_program].custom_group[0] = 1;
+	enc->state[writing_program].custom_group[1] = luaL_checkinteger(localL, 1);
+	enc->state[writing_program].custom_group[2] = luaL_checkinteger(localL, 2);
+	enc->state[writing_program].custom_group[3] = luaL_checkinteger(localL, 3);
     return 0;
 }
 
 int lua_put_rds2_custom_group(lua_State *localL) {
-	enc->state[enc->program].custom_group2[0] = 1;
-	enc->state[enc->program].custom_group2[1] = luaL_checkinteger(localL, 1);
-	enc->state[enc->program].custom_group2[2] = luaL_checkinteger(localL, 2);
-	enc->state[enc->program].custom_group2[3] = luaL_checkinteger(localL, 3);
-	enc->state[enc->program].custom_group2[4] = luaL_checkinteger(localL, 4);
+	enc->state[writing_program].custom_group2[0] = 1;
+	enc->state[writing_program].custom_group2[1] = luaL_checkinteger(localL, 1);
+	enc->state[writing_program].custom_group2[2] = luaL_checkinteger(localL, 2);
+	enc->state[writing_program].custom_group2[3] = luaL_checkinteger(localL, 3);
+	enc->state[writing_program].custom_group2[4] = luaL_checkinteger(localL, 4);
     return 0;
 }
 
@@ -268,8 +284,8 @@ STR_RAW_GETTER(grp_sqc_rds2, 32)
 
 int lua_set_rds_grp_sqc(lua_State *localL) {
 	const char* str = luaL_checklstring(localL, 1, NULL);
-    if(_strnlen(str, 2) < 1) set_rds_grpseq(enc, DEFAULT_GRPSQC);
-    else set_rds_grpseq(enc, str);
+    if(_strnlen(str, 2) < 1) set_rds_grpseq(enc, DEFAULT_GRPSQC, writing_program);
+    else set_rds_grpseq(enc, str, writing_program);
     return 0;
 }
 
@@ -284,16 +300,16 @@ int lua_set_rds_eon(lua_State *localL) {
     if (!lua_isboolean(localL, 4)) return luaL_error(localL, "boolean expected, got %s", luaL_typename(localL, 4));
     if (!lua_isboolean(localL, 5)) return luaL_error(localL, "boolean expected, got %s", luaL_typename(localL, 5));
     luaL_checktype(localL, 8, LUA_TTABLE);
-    enc->data[enc->program].eon[eon].enabled = lua_toboolean(localL, 2);
-    enc->data[enc->program].eon[eon].pi = luaL_checkinteger(localL, 3);
-    enc->data[enc->program].eon[eon].tp = lua_toboolean(localL, 4);
-    enc->data[enc->program].eon[eon].ta = lua_toboolean(localL, 5);
-    enc->data[enc->program].eon[eon].pty = luaL_checkinteger(localL, 6);
-	_strncpy(enc->data[enc->program].eon[eon].ps, luaL_checklstring(localL, 7, NULL), 8);
+    enc->data[writing_program].eon[eon].enabled = lua_toboolean(localL, 2);
+    enc->data[writing_program].eon[eon].pi = luaL_checkinteger(localL, 3);
+    enc->data[writing_program].eon[eon].tp = lua_toboolean(localL, 4);
+    enc->data[writing_program].eon[eon].ta = lua_toboolean(localL, 5);
+    enc->data[writing_program].eon[eon].pty = luaL_checkinteger(localL, 6);
+	_strncpy(enc->data[writing_program].eon[eon].ps, luaL_checklstring(localL, 7, NULL), 8);
 
     int n = lua_rawlen(localL, 8);
     if (n == 0) {
-        memset(&(enc->data[enc->program].eon[eon].af), 0, sizeof(RDSAFs));
+        memset(&(enc->data[writing_program].eon[eon].af), 0, sizeof(RDSAFs));
         return 0;
     }
     if(n > 25) return luaL_error(localL, "table length over 25");
@@ -307,23 +323,23 @@ int lua_set_rds_eon(lua_State *localL) {
         else return luaL_error(localL, "number expected, got %s", luaL_typename(localL, -1));
         lua_pop(localL, 1);
     }
-	memcpy(&(enc->data[enc->program].eon[eon].af), &new_af, sizeof(new_af));
+	memcpy(&(enc->data[writing_program].eon[eon].af), &new_af, sizeof(new_af));
 
-    enc->data[enc->program].eon[eon].data = luaL_checkinteger(localL, 9);
+    enc->data[writing_program].eon[eon].data = luaL_checkinteger(localL, 9);
     return 0;
 }
 
 int lua_get_rds_eon(lua_State *localL) {
     int eon = luaL_checkinteger(localL, 1);
     if(eon >= EONs) return luaL_error(localL, "eon index exceeded");
-    lua_pushboolean(localL, enc->data[enc->program].eon[eon].enabled);
-    lua_pushinteger(localL, enc->data[enc->program].eon[eon].pi);
-    lua_pushboolean(localL, enc->data[enc->program].eon[eon].tp);
-    lua_pushboolean(localL, enc->data[enc->program].eon[eon].ta);
-    lua_pushinteger(localL, enc->data[enc->program].eon[eon].pty);
-    lua_pushlstring(localL, enc->data[enc->program].eon[eon].ps, 8);
+    lua_pushboolean(localL, enc->data[writing_program].eon[eon].enabled);
+    lua_pushinteger(localL, enc->data[writing_program].eon[eon].pi);
+    lua_pushboolean(localL, enc->data[writing_program].eon[eon].tp);
+    lua_pushboolean(localL, enc->data[writing_program].eon[eon].ta);
+    lua_pushinteger(localL, enc->data[writing_program].eon[eon].pty);
+    lua_pushlstring(localL, enc->data[writing_program].eon[eon].ps, 8);
     lua_createtable(localL, 0, 0); // don't have decoding for AF, so just return empty table
-    lua_pushinteger(localL, enc->data[enc->program].eon[eon].data);
+    lua_pushinteger(localL, enc->data[writing_program].eon[eon].data);
     return 8;
 }
 
@@ -353,11 +369,11 @@ int lua_set_rds_udg(lua_State *localL) {
     }
 
     if(xy) {
-        memcpy(&(enc->data[enc->program].udg2), blocks, n * sizeof(uint16_t[3]));
-		enc->data[enc->program].udg2_len = n;
+        memcpy(&(enc->data[writing_program].udg2), blocks, n * sizeof(uint16_t[3]));
+		enc->data[writing_program].udg2_len = n;
     } else {
-        memcpy(&(enc->data[enc->program].udg1), blocks, n * sizeof(uint16_t[3]));
-		enc->data[enc->program].udg1_len = n;
+        memcpy(&(enc->data[writing_program].udg1), blocks, n * sizeof(uint16_t[3]));
+		enc->data[writing_program].udg1_len = n;
     }
 
     return 0;
@@ -389,11 +405,11 @@ int lua_set_rds_udg2(lua_State *localL) {
     }
 
     if(xy) {
-        memcpy(&(enc->data[enc->program].udg2_rds2), blocks, n * sizeof(uint16_t[4]));
-		enc->data[enc->program].udg2_len_rds2 = n;
+        memcpy(&(enc->data[writing_program].udg2_rds2), blocks, n * sizeof(uint16_t[4]));
+		enc->data[writing_program].udg2_len_rds2 = n;
     } else {
-        memcpy(&(enc->data[enc->program].udg1_rds2), blocks, n * sizeof(uint16_t[4]));
-		enc->data[enc->program].udg1_len_rds2 = n;
+        memcpy(&(enc->data[writing_program].udg1_rds2), blocks, n * sizeof(uint16_t[4]));
+		enc->data[writing_program].udg1_len_rds2 = n;
     }
 
     return 0;
diff --git a/src/lua_api.h b/src/lua_api.h
index f9039b5..28f00e9 100644
--- a/src/lua_api.h
+++ b/src/lua_api.h
@@ -68,6 +68,9 @@ int lua_get_rds_link(lua_State *localL);
 int lua_set_rds_program(lua_State *localL);
 int lua_get_rds_program(lua_State *localL);
 
+int lua_set_rds_writing_program(lua_State *localL);
+int lua_get_rds_writing_program(lua_State *localL);
+
 int lua_set_rds_rt_switching_period(lua_State *localL);
 int lua_get_rds_rt_switching_period(lua_State *localL);
 
diff --git a/src/lua_rds.c b/src/lua_rds.c
index 61b3bdd..f670a64 100644
--- a/src/lua_rds.c
+++ b/src/lua_rds.c
@@ -56,6 +56,8 @@ void init_lua(RDSEncoder* _enc) {
     lua_setfield(L, -2, "max_programs");
     lua_registertotable(L, "set_program", lua_set_rds_program);
     lua_registertotable(L, "get_program", lua_get_rds_program);
+    lua_registertotable(L, "set_writing_program", lua_set_rds_writing_program);
+    lua_registertotable(L, "get_writing_program", lua_get_rds_writing_program);
     lua_setglobal(L, "dp");
 
     lua_newtable(L);
@@ -163,16 +165,23 @@ void init_lua(RDSEncoder* _enc) {
     }
 }
 
-void run_lua(char *str, char *cmd_output, size_t* out_len) {
+void run_lua(char *str, size_t str_len, char *cmd_output, size_t *out_len) {
     pthread_mutex_lock(&lua_mutex);
+
     lua_getglobal(L, "data_handle");
 
     if (lua_isfunction(L, -1)) {
-        lua_pushstring(L, str);
+        lua_pushlstring(L, str, str_len);
+
         if (lua_pcall(L, 1, 1, 0) == LUA_OK) {
-            if (lua_isstring(L, -1) && cmd_output) _strncpy(cmd_output, lua_tolstring(L, -1, out_len), 254);
+            if (lua_isstring(L, -1) && cmd_output) {
+                const char *lua_str = lua_tolstring(L, -1, out_len);
+                if (*out_len > 254) *out_len = 254;
+                memcpy(cmd_output, lua_str, *out_len);
+            }
         } else fprintf(stderr, "Lua error: %s at 'data_handle'\n", lua_tostring(L, -1));
-    } else if (lua_isstring(L, -1) && cmd_output) _strncpy(cmd_output, lua_tolstring(L, -1, out_len), 254);
+    } else fprintf(stderr, "'data_handle' is not a function\n");
+
     lua_pop(L, 1);
     pthread_mutex_unlock(&lua_mutex);
 }
diff --git a/src/lua_rds.h b/src/lua_rds.h
index e271a3b..0ce1006 100644
--- a/src/lua_rds.h
+++ b/src/lua_rds.h
@@ -6,7 +6,7 @@
 #include <lauxlib.h>
 
 void init_lua(RDSEncoder* _enc);
-void run_lua(char *str, char *cmd_output, size_t* out_len);
+void run_lua(char *str, size_t str_len, char *cmd_output, size_t* out_len);
 int lua_group(RDSGroup* group, const char grp);
 int lua_rds2_group(RDSGroup* group, int stream);
 void lua_call_function_nolock(const char* function);
diff --git a/src/rds.c b/src/rds.c
index c824fac..de8fb2a 100644
--- a/src/rds.c
+++ b/src/rds.c
@@ -329,14 +329,14 @@ void reset_rds_state(RDSEncoder* enc, uint8_t program) {
 
 	tempCoder.state[program].rt_ab = 1;
 	tempCoder.state[program].ptyn_ab = 1;
-	set_rds_rt1(&tempCoder, enc->data[program].rt1);
-	set_rds_rt2(&tempCoder, enc->data[program].rt2);
-	set_rds_ps(&tempCoder, enc->data[program].ps);
-	set_rds_tps(&tempCoder, enc->data[program].tps);
-	set_rds_ptyn(&tempCoder, enc->data[program].ptyn);
-	set_rds_lps(&tempCoder, enc->data[program].lps);
-	set_rds_grpseq(&tempCoder, enc->data[program].grp_sqc);
-	set_rds_grpseq2(&tempCoder, enc->data[program].grp_sqc_rds2);
+	set_rds_rt1(&tempCoder, enc->data[program].rt1, program);
+	set_rds_rt2(&tempCoder, enc->data[program].rt2, program);
+	set_rds_ps(&tempCoder, enc->data[program].ps), program;
+	set_rds_tps(&tempCoder, enc->data[program].tps, program);
+	set_rds_lps(&tempCoder, enc->data[program].lps, program);
+	set_rds_ptyn(&tempCoder, enc->data[program].ptyn, program);
+	set_rds_grpseq(&tempCoder, enc->data[program].grp_sqc, program);
+	set_rds_grpseq2(&tempCoder, enc->data[program].grp_sqc_rds2, program);
 
 	struct tm *utc;
 	time_t now;
diff --git a/src/rds.h b/src/rds.h
index bab4681..baa759c 100644
--- a/src/rds.h
+++ b/src/rds.h
@@ -195,12 +195,12 @@ void add_checkwords(RDSGroup *group, uint8_t *bits);
 void get_rds_group(RDSEncoder* enc, RDSGroup *group, uint8_t stream);
 void get_rds_bits(RDSEncoder* enc, uint8_t *bits, uint8_t stream);
 
-void set_rds_rt1(RDSEncoder* enc, const char *rt1);
-void set_rds_rt2(RDSEncoder* enc, const char *rt2);
-void set_rds_default_rt(RDSEncoder* enc, const char *rt);
-void set_rds_ps(RDSEncoder* enc, const char *ps);
-void set_rds_tps(RDSEncoder* enc, const char *tps);
-void set_rds_lps(RDSEncoder* enc, const char *lps);
-void set_rds_ptyn(RDSEncoder *enc, const char *ptyn);
-void set_rds_grpseq(RDSEncoder* enc, const char *grpseq);
-void set_rds_grpseq2(RDSEncoder* enc, const char *grpseq2);
\ No newline at end of file
+void set_rds_rt1(RDSEncoder* enc, const char *rt1, uint8_t program);
+void set_rds_rt2(RDSEncoder* enc, const char *rt2, uint8_t program);
+void set_rds_default_rt(RDSEncoder* enc, const char *rt, uint8_t program);
+void set_rds_ps(RDSEncoder* enc, const char *ps, uint8_t program);
+void set_rds_tps(RDSEncoder* enc, const char *tps, uint8_t program);
+void set_rds_lps(RDSEncoder* enc, const char *lps, uint8_t program);
+void set_rds_ptyn(RDSEncoder *enc, const char *ptyn, uint8_t program);
+void set_rds_grpseq(RDSEncoder* enc, const char *grpseq, uint8_t program);
+void set_rds_grpseq2(RDSEncoder* enc, const char *grpseq2, uint8_t program);
\ No newline at end of file
diff --git a/src/rds_setters.c b/src/rds_setters.c
index 23cb26f..17a3308 100644
--- a/src/rds_setters.c
+++ b/src/rds_setters.c
@@ -1,148 +1,148 @@
 #include "rds.h"
 
-void set_rds_rt1(RDSEncoder* enc, const char *rt1) {
+void set_rds_rt1(RDSEncoder* enc, const char *rt1, uint8_t program) {
 	uint8_t i = 0, len = 0;
 
-	enc->state[enc->program].rt_text_timeout_state = enc->data[enc->program].rt_text_timeout;
+	enc->state[program].rt_text_timeout_state = enc->data[program].rt_text_timeout;
 
-	enc->state[enc->program].rt_update = 1;
+	enc->state[program].rt_update = 1;
 
-	memset(enc->data[enc->program].rt1, ' ', RT_LENGTH);
-	while (*rt1 != 0 && len < RT_LENGTH) enc->data[enc->program].rt1[len++] = *rt1++;
+	memset(enc->data[program].rt1, ' ', RT_LENGTH);
+	while (*rt1 != 0 && len < RT_LENGTH) enc->data[program].rt1[len++] = *rt1++;
 
-	while (len > 0 && enc->data[enc->program].rt1[len - 1] == ' ') len--;
+	while (len > 0 && enc->data[program].rt1[len - 1] == ' ') len--;
 
 	if (len < RT_LENGTH) {
-		enc->state[enc->program].rt_segments = 0;
-		enc->data[enc->program].rt1[len++] = '\r';
+		enc->state[program].rt_segments = 0;
+		enc->data[program].rt1[len++] = '\r';
 		while (i < len) {
 			i += 4;
-			enc->state[enc->program].rt_segments++;
+			enc->state[program].rt_segments++;
 		}
-	} else enc->state[enc->program].rt_segments = 16;
-	if(enc->state[enc->program].rt_segments > 16) enc->state[enc->program].rt_segments = 16; //make sure
+	} else enc->state[program].rt_segments = 16;
+	if(enc->state[program].rt_segments > 16) enc->state[program].rt_segments = 16; //make sure
 }
 
-void set_rds_default_rt(RDSEncoder* enc, const char *rt) {
+void set_rds_default_rt(RDSEncoder* enc, const char *rt, uint8_t program) {
 	uint8_t i = 0, len = 0;
 
-	memset(enc->data[enc->program].default_rt, ' ', RT_LENGTH);
-	while (*rt != 0 && len < RT_LENGTH) enc->data[enc->program].default_rt[len++] = *rt++;
+	memset(enc->data[program].default_rt, ' ', RT_LENGTH);
+	while (*rt != 0 && len < RT_LENGTH) enc->data[program].default_rt[len++] = *rt++;
 
-	while (len > 0 && enc->data[enc->program].default_rt[len - 1] == ' ') len--;
+	while (len > 0 && enc->data[program].default_rt[len - 1] == ' ') len--;
 
 	if (len < RT_LENGTH) {
-		enc->state[enc->program].default_rt_segments = 0;
-		enc->data[enc->program].default_rt[len++] = '\r';
+		enc->state[program].default_rt_segments = 0;
+		enc->data[program].default_rt[len++] = '\r';
 		while (i < len) {
 			i += 4;
-			enc->state[enc->program].default_rt_segments++;
+			enc->state[program].default_rt_segments++;
 		}
-	} else enc->state[enc->program].default_rt_segments = 16;
-	if(enc->state[enc->program].default_rt_segments > 16) enc->state[enc->program].default_rt_segments = 16; //make sure
+	} else enc->state[program].default_rt_segments = 16;
+	if(enc->state[program].default_rt_segments > 16) enc->state[program].default_rt_segments = 16; //make sure
 }
 
-void set_rds_rt2(RDSEncoder* enc, const char *rt2) {
+void set_rds_rt2(RDSEncoder* enc, const char *rt2, uint8_t program) {
 	uint8_t i = 0, len = 0;
 
-	enc->state[enc->program].rt2_update = 1;
+	enc->state[program].rt2_update = 1;
 
-	memset(enc->data[enc->program].rt2, ' ', RT_LENGTH);
-	while (*rt2 != 0 && len < RT_LENGTH) enc->data[enc->program].rt2[len++] = *rt2++;
+	memset(enc->data[program].rt2, ' ', RT_LENGTH);
+	while (*rt2 != 0 && len < RT_LENGTH) enc->data[program].rt2[len++] = *rt2++;
 
-	while (len > 0 && enc->data[enc->program].rt2[len - 1] == ' ') len--;
+	while (len > 0 && enc->data[program].rt2[len - 1] == ' ') len--;
 
 	if (len < RT_LENGTH) {
-		enc->state[enc->program].rt2_segments = 0;
-		enc->data[enc->program].rt2[len++] = '\r';
+		enc->state[program].rt2_segments = 0;
+		enc->data[program].rt2[len++] = '\r';
 		while (i < len) {
 			i += 4;
-			enc->state[enc->program].rt2_segments++;
+			enc->state[program].rt2_segments++;
 		}
-	} else enc->state[enc->program].rt2_segments = 16;
-	if(enc->state[enc->program].rt2_segments > 16) enc->state[enc->program].rt2_segments = 16; //make sure
+	} else enc->state[program].rt2_segments = 16;
+	if(enc->state[program].rt2_segments > 16) enc->state[program].rt2_segments = 16; //make sure
 }
 
-void set_rds_ps(RDSEncoder* enc, const char *ps) {
+void set_rds_ps(RDSEncoder* enc, const char *ps, uint8_t program) {
 	uint8_t len = 0;
 
-	enc->state[enc->program].ps_update = 1;
-	memset(enc->data[enc->program].ps, ' ', PS_LENGTH);
-	while (*ps != 0 && len < PS_LENGTH) enc->data[enc->program].ps[len++] = *ps++;
+	enc->state[program].ps_update = 1;
+	memset(enc->data[program].ps, ' ', PS_LENGTH);
+	while (*ps != 0 && len < PS_LENGTH) enc->data[program].ps[len++] = *ps++;
 }
 
-void set_rds_tps(RDSEncoder* enc, const char *tps) {
+void set_rds_tps(RDSEncoder* enc, const char *tps, uint8_t program) {
 	uint8_t len = 0;
 
-	enc->state[enc->program].tps_update = 1;
+	enc->state[program].tps_update = 1;
 	if(tps[0] == '\0') {
-		memset(enc->data[enc->program].tps, 0, PS_LENGTH);
+		memset(enc->data[program].tps, 0, PS_LENGTH);
 		return;
 	}
 
-	memset(enc->data[enc->program].tps, ' ', PS_LENGTH);
-	while (*tps != 0 && len < PS_LENGTH) enc->data[enc->program].tps[len++] = *tps++;
+	memset(enc->data[program].tps, ' ', PS_LENGTH);
+	while (*tps != 0 && len < PS_LENGTH) enc->data[program].tps[len++] = *tps++;
 }
 
-void set_rds_lps(RDSEncoder* enc, const char *lps) {
+void set_rds_lps(RDSEncoder* enc, const char *lps, uint8_t program) {
 	uint8_t i = 0, len = 0;
 
-	enc->state[enc->program].lps_update = 1;
+	enc->state[program].lps_update = 1;
 	if(lps[0] == '\0') {
-		memset(enc->data[enc->program].lps, 0, LPS_LENGTH);
+		memset(enc->data[program].lps, 0, LPS_LENGTH);
 		return;
 	}
-	memset(enc->data[enc->program].lps, ' ', LPS_LENGTH);
-	while (*lps != 0 && len < LPS_LENGTH) enc->data[enc->program].lps[len++] = *lps++;
+	memset(enc->data[program].lps, ' ', LPS_LENGTH);
+	while (*lps != 0 && len < LPS_LENGTH) enc->data[program].lps[len++] = *lps++;
 
 	if (len < LPS_LENGTH) {
-		enc->state[enc->program].lps_segments = 0;
-		enc->data[enc->program].lps[len++] = '\r';
+		enc->state[program].lps_segments = 0;
+		enc->data[program].lps[len++] = '\r';
 		while (i < len) {
 			i += 4;
-			enc->state[enc->program].lps_segments++;
+			enc->state[program].lps_segments++;
 		}
-	} else enc->state[enc->program].lps_segments = 8;
-	if(enc->state[enc->program].lps_segments > 8) enc->state[enc->program].lps_segments = 8; //make sure
+	} else enc->state[program].lps_segments = 8;
+	if(enc->state[program].lps_segments > 8) enc->state[program].lps_segments = 8; //make sure
 }
 
-void set_rds_ptyn(RDSEncoder* enc, const char *ptyn) {
+void set_rds_ptyn(RDSEncoder* enc, const char *ptyn, uint8_t program) {
 	uint8_t len = 0;
 
-	enc->state[enc->program].ptyn_update = 1;
+	enc->state[program].ptyn_update = 1;
 
 	if(ptyn[0] == '\0') {
-		memset(enc->data[enc->program].ptyn, 0, PTYN_LENGTH);
+		memset(enc->data[program].ptyn, 0, PTYN_LENGTH);
 		return;
 	}
 
-	memset(enc->data[enc->program].ptyn, ' ', PTYN_LENGTH);
-	while (*ptyn != 0 && len < PTYN_LENGTH) enc->data[enc->program].ptyn[len++] = *ptyn++;
+	memset(enc->data[program].ptyn, ' ', PTYN_LENGTH);
+	while (*ptyn != 0 && len < PTYN_LENGTH) enc->data[program].ptyn[len++] = *ptyn++;
 }
 
-void set_rds_grpseq(RDSEncoder* enc, const char *grpseq) {
+void set_rds_grpseq(RDSEncoder* enc, const char *grpseq, uint8_t program) {
 	uint8_t len = 0;
 
 	if(grpseq[0] == '\0') {
 		while (DEFAULT_GRPSQC[len] != 0 && len < 32) {
-			enc->data[enc->program].grp_sqc[len] = DEFAULT_GRPSQC[len];
+			enc->data[program].grp_sqc[len] = DEFAULT_GRPSQC[len];
 			len++;
 		}
 		return;
 	}
 
-	memset(enc->data[enc->program].grp_sqc, 0, 32);
-	while (*grpseq != 0 && len < 32) enc->data[enc->program].grp_sqc[len++] = *grpseq++;
+	memset(enc->data[program].grp_sqc, 0, 32);
+	while (*grpseq != 0 && len < 32) enc->data[program].grp_sqc[len++] = *grpseq++;
 }
-void set_rds_grpseq2(RDSEncoder* enc, const char *grpseq2) {
+void set_rds_grpseq2(RDSEncoder* enc, const char *grpseq2, uint8_t program) {
 	uint8_t len = 0;
 
 	if(grpseq2[0] == '\0') {
-		memset(enc->data[enc->program].grp_sqc_rds2, 0, 32);
-		memcpy(enc->data[enc->program].grp_sqc_rds2, enc->data[enc->program].grp_sqc, 32);
+		memset(enc->data[program].grp_sqc_rds2, 0, 32);
+		memcpy(enc->data[program].grp_sqc_rds2, enc->data[program].grp_sqc, 32);
 		return;
 	}
 
-	memset(enc->data[enc->program].grp_sqc_rds2, 0, 32);
-	while (*grpseq2 != 0 && len < 32) enc->data[enc->program].grp_sqc_rds2[len++] = *grpseq2++;
+	memset(enc->data[program].grp_sqc_rds2, 0, 32);
+	while (*grpseq2 != 0 && len < 32) enc->data[program].grp_sqc_rds2[len++] = *grpseq2++;
 }
\ No newline at end of file
diff --git a/src/udp_server.c b/src/udp_server.c
index dfda0d5..2c81e10 100644
--- a/src/udp_server.c
+++ b/src/udp_server.c
@@ -44,22 +44,46 @@ void poll_udp_server() {
 	ssize_t bytes_read = recvfrom(sockfd, buf, BUF_SIZE - 1, 0, (struct sockaddr *)&client_addr, &client_len);
     if (bytes_read <= 0) return;
 
-    buf[bytes_read] = '\0';
+    size_t start = 0;
+
+    for (ssize_t i = 0; i < bytes_read; i++) {
+        if (buf[i] == '\n' || (unsigned char)buf[i] == 0xFF) {
+            size_t len = i - start;
+
+            if (len > 0 && len < BUF_SIZE) {
+                memset(cmd_buf, 0, BUF_SIZE);
+                memcpy(cmd_buf, buf + start, len);
+                memset(cmd_output, 0, BUF_SIZE);
+
+                size_t out_len = 0;
+                run_lua(cmd_buf, len, cmd_output, &out_len);
+
+                if (out_len > 0 &&
+                    sendto(sockfd, cmd_output, out_len, 0,
+                        (struct sockaddr *)&client_addr, client_len) == -1) {
+                    perror("sendto");
+                }
+            }
+
+            start = i + 1;
+        }
+    }
+
+    if (start < bytes_read) {
+        size_t len = bytes_read - start;
 
-    char *token = strtok(buf, "\r\n");
-    while (token != NULL) {
-        size_t len = strlen(token);
         if (len > 0 && len < BUF_SIZE) {
-            memset(cmd_buf, 0, BUF_SIZE);
-            strncpy(cmd_buf, token, BUF_SIZE - 1);
-
-            memset(cmd_output, 0, BUF_SIZE);
+            memcpy(cmd_buf, buf + start, len);
 
             size_t out_len = 0;
-            run_lua(cmd_buf, cmd_output, &out_len);
-            if (out_len > 0 && sendto(sockfd, cmd_output, out_len, 0, (struct sockaddr *)&client_addr, client_len) == -1) perror("sendto"); // no walrus
+            run_lua(cmd_buf, len, cmd_output, &out_len);
+
+            if (out_len > 0 &&
+                sendto(sockfd, cmd_output, out_len, 0,
+                    (struct sockaddr *)&client_addr, client_len) == -1) {
+                perror("sendto");
+            }
         }
-        token = strtok(NULL, "\r\n");
     }
 }
 
diff --git a/standards/R22_039_1_part10.pdf b/standards/R22_039_1_part10.pdf
new file mode 100644
index 0000000..7b7f602
Binary files /dev/null and b/standards/R22_039_1_part10.pdf differ