AT command interface works! The cause of the breakage was the same Nucleus API issue with NU_Create_Timer() which we encountered at the very beginning of this project with Riviera timers: the code in uartfax.c from TCS211 was passing 0 as the initial dummy value for the timer duration, and our FreeNucleus version doesn't like it. The fix is the same: pass 1 as the initial dummy value instead.

CC=	gcc
CFLAGS=	-O2 -I../include
PROG=	g23sh
OBJS=	init.o main.o pktsort.o sendsp.o usercmd.o
LIBS=	../libasync/libasync.a ../libg23/libg23.a
INSTBIN=/usr/local/bin

all:	${PROG}

${PROG}: ${OBJS} ${LIBS}
	${CC} ${CFLAGS} -o $@ ${OBJS} ${LIBS}

install:	${PROG}
	mkdir -p ${INSTBIN}
	install -c ${PROG} ${INSTBIN}

clean:
	rm -f *.o *.out *errs ${PROG}