modemmanager: add missing ubus status backend via mmcli

The 'modemmanager' uses the 'dbus'. Status information can be retrieved
with the 'mmcli' command, this can also be output in json format.

This commit adds a new 'ubus' backend with which this information can
be easily accessed via ubus.

* ubus call modemmanager info
* ubus call modemmanager dump

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/modemmanager/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=modemmanager
 PKG_VERSION:=1.22.0
-PKG_RELEASE:=16
+PKG_RELEASE:=17
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://gitlab.freedesktop.org/mobile-broadband/ModemManager.git
@@ -43,6 +43,7 @@ define Package/modemmanager
 	+glib2 \
 	+dbus \
 	+ppp \
+	+lua-cjson \
 	+MODEMMANAGER_WITH_MBIM:libmbim \
 	+MODEMMANAGER_WITH_QMI:libqmi \
 	+MODEMMANAGER_WITH_QRTR:libqrtr-glib
@@ -95,6 +96,10 @@ define Package/modemmanager/install
 	$(INSTALL_BIN) ./files/usr/sbin/ModemManager-wrapper $(1)/usr/sbin
 	$(INSTALL_BIN) ./files/usr/sbin/ModemManager-monitor $(1)/usr/sbin
 
+	$(INSTALL_DIR) $(1)/usr/libexec/rpcd
+	$(INSTALL_BIN) ./files/usr/libexec/rpcd/modemmanager \
+		$(1)/usr/libexec/rpcd/
+
 	$(INSTALL_DIR) $(1)/usr/bin
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/mmcli $(1)/usr/bin
 

net/modemmanager/files/usr/libexec/rpcd/modemmanager

@@ -0,0 +1,216 @@
+#!/usr/bin/env lua
+
+local json = require "cjson"
+
+local status = {}
+local bearers = {}
+local sim = {}
+local signal = {}
+local location = {}
+
+local info = {}
+
+function mm_get_modem_bearer(index)
+
+	local command = string.format("/usr/bin/mmcli --bearer=%s --output-json 2>/dev/null", index)
+
+	local handle = io.popen(command)
+	local output = handle:read("*a")
+	handle:close()
+
+	local ok, status = pcall(function()
+		return json.decode(string.format(output))
+	end)
+
+	if not ok then
+		return
+	end
+
+	table.insert(bearers, status["bearer"])
+end
+
+function mm_get_modem_sim(index)
+
+	local command = string.format("/usr/bin/mmcli --sim=%s --output-json 2>/dev/null", index)
+
+	local handle = io.popen(command)
+	local output = handle:read("*a")
+	handle:close()
+
+	local ok, status = pcall(function()
+		return json.decode(string.format(output))
+	end)
+
+	if not ok then
+		return
+	end
+
+	sim = status["sim"]
+end
+
+function mm_get_modem_signal(modem)
+
+	local command = string.format("/usr/bin/mmcli --modem=%s --signal-get --output-json 2>/dev/null", modem)
+
+	local handle = io.popen(command)
+	local output = handle:read("*a")
+	handle:close()
+
+	local ok, status = pcall(function()
+		return json.decode(string.format(output))
+	end)
+
+	if ok == false then
+		return
+	end
+
+	signal = status["modem"]["signal"]
+end
+
+function mm_get_modem_location(modem)
+
+	local command = string.format("/usr/bin/mmcli --modem=%s --location-get --output-json 2>/dev/null", modem)
+
+	local handle = io.popen(command)
+	local output = handle:read("*a")
+	handle:close()
+
+	local ok, status = pcall(function()
+		return json.decode(string.format(output))
+	end)
+
+	if ok == false then
+		return
+	end
+
+	location = status["modem"]["location"]
+end
+
+function mm_get_modem_status(modem)
+
+	local command = string.format("/usr/bin/mmcli --modem=%s --output-json 2>/dev/null", modem)
+
+	local handle = io.popen(command)
+	local output = handle:read("*a")
+	handle:close()
+
+	local ok, mstatus = pcall(function()
+		return json.decode(string.format(output))
+	end)
+
+	if ok == false then
+		return
+	end
+
+	if mstatus["modem"]["generic"]["bearers"] ~= nil then
+		bearers = {}
+		for k, v in ipairs(mstatus["modem"]["generic"]["bearers"]) do
+			mm_get_modem_bearer(v)
+		end
+		if (next(bearers) ~= nil) then
+			mstatus["modem"]["generic"]["bearers"] = bearers
+		end
+	end
+
+	if mstatus["modem"]["generic"]["sim"] ~= "--" then
+		sim = {}
+		mm_get_modem_sim(mstatus["modem"]["generic"]["sim"])
+		if (next(sim) ~= nil) then
+			mstatus["modem"]["generic"]["sim"] = sim
+		end
+	else
+		mstatus["modem"]["generic"]["sim"] = {}
+	end
+
+	signal = {}
+	mm_get_modem_signal(modem)
+	if (next(signal) ~= nil) then
+		mstatus["modem"]["signal"] = signal
+	else
+		mstatus["modem"]["signal"] = {}
+	end
+
+	location = {}
+	mm_get_modem_location(modem)
+	if (next(location) ~= nil) then
+		mstatus["modem"]["location"] = location
+	else
+		mstatus["modem"]["location"] = {}
+	end
+
+	mstatus["modem"]["device"] = mstatus["modem"]["generic"]["device"]
+
+	table.insert(status["modem"], mstatus["modem"])
+end
+
+function aquire_data_modemmanager()
+
+	local command = string.format("/usr/bin/mmcli --list-modems --output-json 2>/dev/null")
+
+	local handle = io.popen(command)
+	local output = handle:read("*a")
+	handle:close()
+
+	local ok, modems = pcall(function()
+		return json.decode(output)
+	end)
+
+	if not ok then
+		return
+	end
+
+	entry_cache = {}
+	status = {}
+	status["modem"] = {}
+	for k, v in ipairs(modems["modem-list"]) do
+		mm_get_modem_status(modems["modem-list"][k])
+	end
+end
+
+function aquire_data_info()
+	aquire_data_modemmanager()
+
+	-- check if modemmanger is available and is using a modem
+	if status['modem'] == nil then
+		return
+	end
+
+	info['modem'] = {}
+
+	for k, v in ipairs(status['modem']) do
+		local element = {}
+
+		element['imei'] = status['modem'][k]['3gpp']['imei']
+		element['signal'] = status['modem'][k]['generic']['signal-quality']['value']
+		element['technology'] = status['modem'][k]['generic']['access-technologies'][1]
+		if status['modem'][k]['3gpp']['operator-name'] ~= '--' then
+			element['operator'] = status['modem'][k]['3gpp']['operator-name']
+		end
+		if status['modem'][k]['generic']['sim']['properties'] ~= nil then
+			element['iccid'] = status['modem'][k]['generic']['sim']['properties']['iccid']
+			element['imsi'] = status['modem'][k]['generic']['sim']['properties']['imsi']
+		end
+		element['device'] = status['modem'][k]['device']
+
+		table.insert(info['modem'], element)
+	end
+end
+
+function main(cmd, call)
+	if cmd == "list" then
+		print(json.encode({
+			dump = {},
+			info = {}
+		}))
+	elseif cmd == "call" then
+		if call == "dump" then
+			aquire_data_modemmanager()
+			print(json.encode(status))
+		elseif call == "info" then
+			aquire_data_info()
+			print(json.encode(info))
+		end
+	end
+end
+
+main(arg[1], arg[2])