function obc_dissector(buffer, pinfo, tree, TC_TM_PROTOCOL, offset, instance)
  
  local f_timestamp1 = ProtoField.uint64("TC_TM_PROTOCOL.timestamp_obc", "Timestamp", base.DEC)
  local f_fsm_state = ProtoField.uint8("TC_TM_PROTOCOL.fsm_state", "Fsm State", base.DEC)
  local f_num_resets = ProtoField.uint8("TC_TM_PROTOCOL.num_resets", "Num of resets", base.DEC)
  local f_io_error = ProtoField.uint16("TC_TM_PROTOCOL.io_error", "IO error", base.DEC)
  local f_sys_error = ProtoField.uint8("TC_TM_PROTOCOL.sys_error", "Sys error", base.DEC)
  local f_cpu_until = ProtoField.float("TC_TM_PROTOCOL.cpu_until", "Cpu Until", base.DEC)
  local f_iram_rem_heap = ProtoField.uint32("TC_TM_PROTOCOL.iram_rem_heap", "Iram rem heap", base.DEC)
  local f_eram_rem_heap = ProtoField.uint32("TC_TM_PROTOCOL.eram_rem_heap", "Eram rem heap", base.DEC)
  local f_uptime = ProtoField.uint32("TC_TM_PROTOCOL.uptime", "Uptime", base.DEC)
  local f_reset_cause = ProtoField.uint8("TC_TM_PROTOCOL.reset_cause", "Reset cause", base.DEC)
  local f_task_count = ProtoField.uint8("TC_TM_PROTOCOL.task_count", "Task Count", base.DEC)
  local ipc_fail_cntr = ProtoField.uint16("TC_TM_PROTOCOL.ipc_fail_cntr", "Ipc Fail Cntr", base.DEC)

  -- Add the fields to the protocol
TC_TM_PROTOCOL.fields = {
    f_timestamp1, f_fsm_state, f_num_resets,f_io_error, f_sys_error, f_cpu_until, f_iram_rem_heap,
    f_eram_rem_heap, f_uptime, f_reset_cause, f_task_count, f_ipc_fail_cntr
}

local subtree = tree:add(TC_TM_PROTOCOL, buffer(), "OBC")

for i=0, instance-1 do
  local subtree1 = subtree:add(TC_TM_PROTOCOL, buffer(), "Instance "..i)
   -- dissect timestamp 
   local data1
     --for i=0, 8 do
     --data1 = buffer(offset, 8):le_uint()
     subtree1:add(f_timestamp1, buffer(offset, 8):le_uint64())
     offset = offset + 8
     
     --dissect fsm_state
     --local data2 = buffer(offset,1):le_uint()
     subtree1:add(f_fsm_state, buffer(offset,1):le_uint())
     offset = offset + 1
     
     --dissect f_num_resets
     local data3 = buffer(offset,1):le_uint()
     subtree1:add(f_num_resets, data3)
      offset = offset + 1  
      
      --dissect io_error
     subtree1:add(f_io_error , buffer(offset, 2):le_uint())
     offset = offset + 2
     
     --dissect sys_error
     --local data2 = buffer(offset,1):le_uint()
     subtree1:add(f_sys_error, buffer(offset, 1):le_uint())
     offset = offset + 1
     
     
     --dissect f_cpu_until
     local cpu_value = buffer(offset, 4):le_float()
     
     local formatted_value = string.format("%.6f", cpu_value)
      subtree1:add(f_cpu_until, formatted_value)
     offset = offset + 4
   
     --dissect f_iram_rem_heap
      subtree1:add(f_iram_rem_heap, buffer(offset, 4):le_uint())
     offset = offset + 4
     
      --dissect f_eram_rem_heap
      subtree1:add(f_eram_rem_heap, buffer(offset, 4):le_uint())
     offset = offset + 4
     
     --dissect f_uptime
      subtree1:add(f_uptime, buffer(offset, 4):le_uint())
     offset = offset + 4
     
       --dissect f_reset_cause
      subtree1:add(f_reset_cause, buffer(offset, 1):le_uint())
     offset = offset + 1
     
     --dissect f_task_count
     local task_count = buffer(offset, 1):le_uint()
      subtree1:add(f_task_count, buffer(offset, 1):le_uint())
     offset = offset + 1
     
     
     for i=0, task_count - 1 do
       local fail = buffer(offset, 2):le_uint()
       if fail == 0 then
         i = i + 2
         offset = offset + 2
         
       else
         subtree1:add(f_ipc_fail_cntr, buffer(offset, 2):le_uint())
         offset = offset + 2
         i = i + 2
       end
     end
     
   end
     
     
end