mbusd: add mbusd

Mbusd is open-source Modbus TCP to Modbus RTU (RS-232/485) gateway.

Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>

net/mbusd/files/mbusd.conf

@@ -0,0 +1,17 @@
+config mbusd
+	option enabled 0
+	option port 502
+	option loglevel 2
+
+	#option max_connections 32
+	#option timeout 60
+
+	option device '/dev/ttyUSB0'
+	option speed 19200
+	option databits 8
+	option parity 0
+	option stopbits 2
+	option rts 0
+
+	#option rtu_retries 3
+	#option rtu_wait 500

net/mbusd/files/mbusd.init

@@ -0,0 +1,68 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2019 OpenWrt.org
+
+START=90
+USE_PROCD=1
+NAME=mbusd
+
+
+mbusd_instance() {
+	[ "$2" = 0 ] || {
+		echo "Validation failed"
+		return 1
+	}
+	[ "$enabled" -gt 0 ] || return 1
+
+
+	[ "$parity" = 0 ] && parity=n || parity=y
+	[ "$rts" = 0 ] && rts=
+
+
+	procd_open_instance mbusd-$port
+	procd_set_param command /usr/bin/mbusd \
+		-d \
+		-L - \
+		-P $port \
+		-v $loglevel \
+		${max_connections:+-C $max_connections} \
+		${timeout:+-T $timeout} \
+		-p $device \
+		-s $speed \
+		-m ${databits}${parity}${stopbits} \
+		${rts:+-t} \
+		${rtu_retries:+-N $rtu_retries} \
+		${rtu_wait:+-W $rtu_wait}
+
+	procd_set_param stdout 1
+	procd_set_param stderr 1
+	procd_set_param respawn
+
+	procd_close_instance
+}
+
+validate_section_mbusd() {
+	uci_load_validate mbusd mbusd "$1" "$2" \
+		'enabled:bool:1' \
+		'port:port:502' \
+		'loglevel:uinteger:2' \
+		'max_connections:uinteger' \
+		'timeout:uinteger' \
+		'device:string' \
+		'speed:uinteger' \
+		'databits:uinteger' \
+		'parity:bool' \
+		'stopbits:uinteger' \
+		'rts:bool:0' \
+		'rtu_retries:uinteger' \
+		'rtu_wait:uinteger'
+}
+
+start_service() {
+	config_load "$NAME"
+	config_foreach validate_section_mbusd mbusd mbusd_instance
+}
+
+service_triggers() {
+	procd_add_reload_trigger "$NAME"
+	procd_add_validation validate_section_mbusd
+}