+ if {![info exists a(TYPE)]} {
+ set op {}
+ foreach k {ONLINE PRESENT} { append op [info exists a($k)] }
+ switch -exact $op {
+ 10 { set a(TYPE) Mains }
+ 01 { set a(TYPE) Battery }
+ default { error "no type and bad op $op" }
+ }
+ debug::debug " guessed type $a(TYPE) from ONLINE PRESENT $op"
+ }