diff --git a/supervisor/session/svsessions.lua b/supervisor/session/svsessions.lua
index 409753c..02bf70b 100644
--- a/supervisor/session/svsessions.lua
+++ b/supervisor/session/svsessions.lua
@@ -35,7 +35,7 @@ local self = {
 ---@param sessions table
 local function _iterate(sessions)
     for i = 1, #sessions do
-        local session = sessions[i]  ---@type plc_session_struct
+        local session = sessions[i]  ---@type plc_session_struct|rtu_session_struct
         if session.open then
             local ok = session.instance.iterate()
             if ok then
diff --git a/supervisor/startup.lua b/supervisor/startup.lua
index d23436d..307b8e6 100644
--- a/supervisor/startup.lua
+++ b/supervisor/startup.lua
@@ -13,7 +13,7 @@ local svsessions = require("supervisor.session.svsessions")
 local config = require("supervisor.config")
 local supervisor = require("supervisor.supervisor")
 
-local SUPERVISOR_VERSION = "alpha-v0.3.10"
+local SUPERVISOR_VERSION = "alpha-v0.4.0"
 
 local print = util.print
 local println = util.println
@@ -44,6 +44,9 @@ local superv_comms = supervisor.comms(SUPERVISOR_VERSION, config.NUM_REACTORS, m
 local MAIN_CLOCK = 0.15
 local loop_clock = util.new_clock(MAIN_CLOCK)
 
+-- start clock
+loop_clock.start()
+
 -- event loop
 while true do
 ---@diagnostic disable-next-line: undefined-field
diff --git a/supervisor/supervisor.lua b/supervisor/supervisor.lua
index 5236e0e..ba07d31 100644
--- a/supervisor/supervisor.lua
+++ b/supervisor/supervisor.lua
@@ -191,7 +191,7 @@ supervisor.comms = function (version, num_reactors, modem, dev_listen, coord_lis
                                     _send_plc_linking(next_seq_id, r_port, { RPLC_LINKING.COLLISION })
                                 else
                                     -- got an ID; assigned to a reactor successfully
-                                    println("connected to reactor " .. packet.data[1] .. " PLC (" .. packet.data[2] .. ") [port " .. r_port .. "]")
+                                    println("connected to reactor " .. packet.data[1] .. " PLC (" .. packet.data[2] .. ") [:" .. r_port .. "]")
                                     log.debug("PLC_LNK: allowed for device at " .. r_port)
                                     _send_plc_linking(next_seq_id, r_port, { RPLC_LINKING.ALLOW })
                                 end
@@ -215,7 +215,7 @@ supervisor.comms = function (version, num_reactors, modem, dev_listen, coord_lis
                     elseif packet.type == SCADA_MGMT_TYPES.RTU_ADVERT then
                         if packet.length >= 1 then
                             -- this is an RTU advertisement for a new session
-                            println("connected to RTU (" .. packet.data[1] .. ") [port " .. r_port .. "]")
+                            println("connected to RTU (" .. packet.data[1] .. ") [:" .. r_port .. "]")
 
                             svsessions.establish_rtu_session(l_port, r_port, packet.data)