diff --git a/plugin.lua b/plugin.lua
index b34fda2..fb4304f 100644
--- a/plugin.lua
+++ b/plugin.lua
@@ -366,19 +366,4 @@ function register_oda_rds2(aid, data, file_related) end
 
 ---Unregisters an RDS 2 ODA, this stops the handler or AID being called/sent
 ---@param oda_id integer
-function unregister_oda_rds2(oda_id) end
-
----This function is defined externally
----Loads the file into RFT and initializes it if needed, note that this needs RDS2 mode 2
----@param aid integer for station logo use 0xFF7F
----@param path string filesystem path on the os
----@param id integer mostly use 0 here
----@param crc integer|boolean false for disabled, true for mode 7, and an integer for any of the modes
----@param once boolean true means that this file will be sent once and then unregistered
----@return boolean interrupted
-function send_rft_file(aid, path, id, crc, once) end
-
----Pauses or resumes the process of sending of the RFT file
----@param aid integer
----@param paused boolean
-function set_rft_paused(aid, paused) end
\ No newline at end of file
+function unregister_oda_rds2(oda_id) end
\ No newline at end of file
diff --git a/scripts/1-rft.lua b/scripts/1-rft.lua
index e94b16b..f2eb0df 100644
--- a/scripts/1-rft.lua
+++ b/scripts/1-rft.lua
@@ -1,82 +1,105 @@
-_Rft_oda_id = nil
-_Rft_file = ""
-_Rft_crc_data = ""
-_Rft_file_segment = 0
-_Rft_crc_segment = 0
-_Rft_toggle = false
-_Rft_last_id = -1
-_Rft_version = 0
-_Rft_crc = false
-_Rft_crc_full_file = 0
-_Rft_crc_mode = 0
-_Rft_crc_sent = false
-_Rft_aid = 0
-_Rft_send_once = false
-_Rft_paused = false
+---@class RftInstance
+---@field oda_id integer|nil The internal ODA registration ID
+---@field file_data string The raw binary content of the file
+---@field crc_data string Calculated CRC chunks for Variant 1 groups
+---@field file_segment integer Current segment index being sent
+---@field crc_segment integer Current CRC byte index being sent
+---@field toggle boolean The RDS2 toggle bit (flips when file content changes)
+---@field last_id integer The file ID used in the previous transmission
+---@field version integer The file version (0-7)
+---@field crc_enabled boolean Whether CRC protection is active
+---@field crc_full_file integer The CRC16 of the entire file (for mode 0)
+---@field crc_mode integer The RDS2 RFT CRC mode (0-5)
+---@field crc_sent_this_cycle boolean Internal flag to interleave CRCs with data
+---@field aid integer The Application Identification (e.g., 0xFF7F for Logo)
+---@field send_once boolean If true, unregisters after one full transmission
+---@field paused boolean If true, the ODA handler will return empty groups
+RftInstance = {}
+RftInstance.__index = RftInstance
 
-local function stop_rft()
-    if _Rft_oda_id ~= nil and _Rft_aid ~= 0 then
-        unregister_oda_rds2(_Rft_oda_id)
-        _Rft_oda_id = nil
-        _Rft_aid = 0
-    end
+--- Creates a new RFT Manager instance.
+---@return RftInstance
+function RftInstance.new()
+    local self = setmetatable({}, RftInstance)
 
-    _Rft_file = ""
-    _Rft_crc_data = ""
-    _Rft_file_segment = 0
-    _Rft_crc_segment = 0
-    _Rft_toggle = false
-    _Rft_last_id = -1
-    _Rft_version = 0
-    _Rft_crc = false
-    _Rft_crc_full_file = 0
-    _Rft_crc_mode = 0
-    _Rft_crc_sent = false
-    _Rft_paused = false
+    self.oda_id = nil
+    self.file_data = ""
+    self.crc_data = ""
+    self.file_segment = 0
+    self.crc_segment = 1
+    self.toggle = false
+    self.last_id = -1
+    self.version = 0
+    self.crc_enabled = false
+    self.crc_full_file = 0
+    self.crc_mode = 0
+    self.crc_sent_this_cycle = false
+    self.aid = 0
+    self.send_once = false
+    self.paused = false
+
+    return self
 end
 
-local function start_rft()
-    if _Rft_oda_id == nil and _Rft_aid ~= 0 then
-        _Rft_oda_id = register_oda_rds2(_Rft_aid, 0, true)
-        set_oda_handler_rds2(_Rft_oda_id, function (stream)
-            if #_Rft_file == 0 or _Rft_paused then return false, 0, 0, 0, 0 end
+function RftInstance:stop()
+    if self.oda_id ~= nil and self.aid ~= 0 then
+        unregister_oda_rds2(self.oda_id)
+        self.oda_id = nil
+    end
 
-            local total_segments = math.ceil(#_Rft_file / 5)
-            local seg = _Rft_file_segment
-            local base = seg * 5 + 1
+    self.file_data = ""
+    self.crc_data = ""
+    self.file_segment = 0
+    self.crc_segment = 1
+    self.paused = false
+end
 
-            if not _Rft_crc_sent and _Rft_crc and (seg % 16 == 0) and stream == 1 then
-                _Rft_crc_sent = true
-                local chunk_address = math.floor((_Rft_crc_segment - 1) / 2)
-                local c = (1 << 12) | (_Rft_crc_mode & 7) << 9 | (chunk_address & 0x1ff)
+--- Internal method to start the ODA handler logic.
+--- Processes RDS2 RFT Variants 0, 1 and Data Groups.
+---@private
+function RftInstance:start()
+    if self.oda_id == nil and self.aid ~= 0 then
+        self.oda_id = register_oda_rds2(self.aid, 0, true)
 
-                local high_byte = 0
-                local low_byte = 0
-                if _Rft_crc_mode ~= 0 then
-                    high_byte = string.byte(_Rft_crc_data, _Rft_crc_segment) or 0
-                    low_byte = string.byte(_Rft_crc_data, _Rft_crc_segment + 1) or 0
+        set_oda_handler_rds2(self.oda_id, function(stream)
+            if #self.file_data == 0 or self.paused then
+                return false, 0, 0, 0, 0
+            end
+
+            local total_segments = math.ceil(#self.file_data / 5)
+
+            if not self.crc_sent_this_cycle and self.crc_enabled and (self.file_segment % 16 == 0) and stream == 1 then
+                self.crc_sent_this_cycle = true
+                local chunk_address = math.floor((self.crc_segment - 1) / 2)
+                local c = (1 << 12) | (self.crc_mode & 7) << 9 | (chunk_address & 0x1ff)
+
+                local high_byte, low_byte
+                if self.crc_mode ~= 0 then
+                    high_byte = string.byte(self.crc_data, self.crc_segment) or 0
+                    low_byte = string.byte(self.crc_data, self.crc_segment + 1) or 0
                 else
-                    high_byte = _Rft_crc_full_file >> 8
-                    low_byte = _Rft_crc_full_file & 0xff
+                    high_byte = self.crc_full_file >> 8
+                    low_byte = self.crc_full_file & 0xff
                 end
 
-                _Rft_crc_segment = _Rft_crc_segment + 2
-                if _Rft_crc_segment > #_Rft_crc_data then _Rft_crc_segment = 1 end
+                self.crc_segment = self.crc_segment + 2
+                if self.crc_segment > #self.crc_data then self.crc_segment = 1 end
 
-                return true, (2 << 14), _Rft_aid, c, (high_byte << 8) | low_byte
-            else _Rft_crc_sent = false end
+                return true, (2 << 14), self.aid, c, (high_byte << 8) | low_byte
+            else self.crc_sent_this_cycle = false end
 
-            local function b(i) return string.byte(_Rft_file, base + i) or 0 end
+            local base = self.file_segment * 5 + 1
+            local function b(i) return string.byte(self.file_data, base + i) or 0 end
 
-            local word1 = (((_Rft_toggle and 1 or 0) << 7) | ((seg >> 8) & 0x7F))
-            local word2 = ((seg & 0xFF) << 8) | b(0)
+            local word1 = (((self.toggle and 1 or 0) << 7) | ((self.file_segment >> 8) & 0x7F))
+            local word2 = ((self.file_segment & 0xFF) << 8) | b(0)
             local word3 = (b(1) << 8) | b(2)
             local word4 = (b(3) << 8) | b(4)
 
-            _Rft_file_segment = seg + 1
-            if _Rft_file_segment >= total_segments then
-                _Rft_file_segment = 0
-                if _Rft_send_once then stop_rft() end
+            self.file_segment = self.file_segment + 1
+            if self.file_segment >= total_segments then
+                self.file_segment = 0
+                if self.send_once then self:stop() end
             end
 
             return true, (2 << 12) | word1, word2, word3, word4
@@ -84,99 +107,62 @@ local function start_rft()
     end
 end
 
----This function is defined externally
----Loads the file into RFT and initializes it if needed, note that this needs RDS2 mode 2
----@param aid integer for station logo use 0xFF7F
----@param path string filesystem path on the os
----@param id integer mostly use 0 here
----@param crc integer|boolean false for disabled, true for mode 7, and an integer for any of the modes
----@param once boolean true means that this file will be sent once and then unregistered
----@return boolean interrupted
-function send_rft_file(aid, path, id, crc, once)
-    local interrupted = (#_Rft_file ~= 0)
+--- Loads a file and begins RDS2 transmission.
+---@param aid integer Application ID (e.g. 0xFF7F for Station Logo)
+---@param path string System path to the file
+---@param id integer File ID (0-63). Use the same ID to update a file, different to trigger a reset.
+---@param crc integer|boolean CRC Mode (0: Full, 1-5: Chunks, true/7: Auto)
+---@param once boolean If true, file is sent once and the stream is closed
+---@return boolean interrupted Returns true if a previous file was already being sent
+function RftInstance:sendFile(aid, path, id, crc, once)
+    local interrupted = (#self.file_data ~= 0)
 
-    if _Rft_aid ~= aid then stop_rft() end
-    _Rft_aid = aid
+    if self.aid ~= aid then self:stop() end
+    self.aid = aid
 
     local file = io.open(path, "rb")
-    if not file then error("Could not open file") end
-    _Rft_file = file:read("*a")
+    if not file then error("Could not open file: " .. path) end
+    self.file_data = file:read("*a")
     file:close()
 
-    _Rft_send_once = once
+    self.send_once = once
 
-    if id == _Rft_last_id then
-        _Rft_toggle = not _Rft_toggle
-        _Rft_crc_sent = 0
-        _Rft_version = _Rft_version + 1
-        if _Rft_version > 7 then _Rft_version = 0 end
+    if id == self.last_id then
+        self.toggle = not self.toggle
+        self.version = (self.version + 1) % 8
     end
 
-    _Rft_crc_data = ""
-    _Rft_crc = (crc ~= false)
+    self.crc_data = ""
+    self.crc_enabled = (crc ~= false)
 
-    local chunk_size = 0
-    if crc and crc == 0 then
-        _Rft_crc_mode = 0
-        _Rft_crc_full_file = crc16(_Rft_file)
-    elseif crc and crc == 1 and #_Rft_file <= 40960 then
-        _Rft_crc_mode = 1
-        chunk_size = 5 * 16
-    elseif crc and crc == 2 and #_Rft_file < 40960 and #_Rft_file >= 81920 then
-        _Rft_crc_mode = 2
-        chunk_size = 5 * 32
-    elseif crc and crc == 3 and #_Rft_file > 81960 then
-        _Rft_crc_mode = 3
-        chunk_size = 5 * 64
-    elseif crc and crc == 4 and #_Rft_file > 81960 then
-        _Rft_crc_mode = 4
-        chunk_size = 5 * 128
-    elseif crc and crc == 5 and #_Rft_file > 81960 then
-        _Rft_crc_mode = 5
-        chunk_size = 5 * 256
-    elseif crc and (crc == 7 or crc == true) then
-        if #_Rft_file <= 40960 then
-            _Rft_crc_mode = 1
-            chunk_size = 5*16
-        elseif #_Rft_file > 40960 and #_Rft_file <= 81920 then
-            _Rft_crc_mode = 2
-            chunk_size = 5*32
-        elseif #_Rft_file > 81960 then
-            _Rft_crc_mode = 3
-            chunk_size = 5*64
-        end
+    local f_size = #self.file_data
+    if crc == 0 then
+        self.crc_mode = 0
+        self.crc_full_file = crc16(self.file_data)
+    elseif crc == true or crc == 7 then
+        if f_size <= 40960 then self.crc_mode = 1
+        elseif f_size > 40960 and f_size <= 81920 then self.crc_mode = 2
+        else self.crc_mode = 3 end
     else
-        _Rft_crc = false
+        self.crc_mode = crc and 1 or 0
     end
 
-    if _Rft_crc and chunk_size ~= 0 then
-        for i = 1, #_Rft_file, chunk_size do
-            local chunk = string.sub(_Rft_file, i, i + chunk_size - 1)
-            local crc_val = crc16(chunk)
-            _Rft_crc_data = _Rft_crc_data .. string.char(math.floor(crc_val / 256), crc_val % 256)
+    local chunk_multipliers = {16, 32, 64, 128, 256}
+    local multiplier = chunk_multipliers[self.crc_mode]
+    if self.crc_enabled and multiplier then
+        local chunk_size = 5 * multiplier
+        for i = 1, f_size, chunk_size do
+            local chunk = string.sub(self.file_data, i, i + chunk_size - 1)
+            local v = crc16(chunk)
+            self.crc_data = self.crc_data .. string.char(v >> 8, v & 0xff)
         end
     end
 
-    if #_Rft_file > 262143 then error("The file is too large", 2) end
-    if _Rft_oda_id == nil then start_rft() end
----@diagnostic disable-next-line: param-type-mismatch
-    set_oda_id_data_rds2(_Rft_oda_id, #_Rft_file | (id & 63) << 18 | (_Rft_version & 7) << 24 | (_Rft_crc and 1 or 0) << 27)
-    _Rft_last_id = id
+    if f_size > 262143 then error("File too large") end
+    if self.oda_id == nil then self:start() end
 
-    _Rft_paused = false
+    set_oda_id_data_rds2(self.oda_id, f_size | (id & 63) << 18 | (self.version & 7) << 24 | (self.crc_enabled and 1 or 0) << 27)
+    self.last_id = id
+    self.paused = false
     return interrupted
-end
-
----Pauses or resumes the process of sending of the RFT file
----@param aid integer
----@param paused boolean
-function set_rft_paused(aid, paused)
-    if aid ~= _Rft_aid then error("AID does not match", 2) end
-    _Rft_paused = paused
-end
-
-local _old_on_state_oda_rft = on_state
-function on_state()
-    stop_rft()
-    if type(_old_on_state_oda_rft) == "function" then _old_on_state_oda_rft() end
-end
+end
\ No newline at end of file