fix valve readback

the ccu4 firmware does not report changes on valves upon the ?
command. fix it: poll explicitly

tcl/drivers/ccu4.tcl

@@ -385,12 +385,14 @@ proc stdConfig::ccu4 {{title CCU4} args} {
       } elseif {[string match valve* $a]} {
         set nvalve [string range $a 5 end]
         for {set ch 1} {$ch <= 12} {incr ch} {
-          node v$ch upd
+          node v$ch rd -int 10
+          prop read ccu4::readValve v$ch
           prop enum valve_off,valve_on,no_valve,timeout,timeout1,boost
           if {$ch > $nvalve} {
             prop visible false
           }
           node vc$ch out -int
+          prop write ccu4::writeValve v$ch
           prop enum valve_off,valve_on
           if {$ch > $nvalve} {
             prop visible false
@@ -404,6 +406,20 @@ proc stdConfig::ccu4 {{title CCU4} args} {
   return "CCU4"
 } 
 
+proc ccu4::readValve {valve} {
+  # for some strange reason, v... are not queried with '?'
+  # we have to do it here
+  sct send $valve
+  return ccu4::complete
+}
+
+proc ccu4::writeValve {valve} {
+  set res [ccu4::write]
+  # update readback value immediately
+  hupdate [sct parent]/$valve [sct target]
+  return $res
+}
+
 proc ccu4::completeStart {name} {
   set resval(cid) 0
   set resval(cir) ""