add gps

luci-app-gpoint-main/root/usr/share/gpoint/lib/serial.lua

@@ -0,0 +1,73 @@
+-------------------------------------------------------------------
+-- Wrapper for working with a modem via serial port
+-------------------------------------------------------------------
+-- Copyright 2021-2022 Vladislav Kadulin <spanky@yandex.ru>
+-- Licensed to the GNU General Public License v3.0
+
+local rs232 = require("luars232")
+
+local serial = {}
+
+local function configSerial(port)
+	assert(port:set_baud_rate(rs232.RS232_BAUD_115200)  == rs232.RS232_ERR_NOERROR)
+	assert(port:set_parity(rs232.RS232_PARITY_NONE)     == rs232.RS232_ERR_NOERROR)
+	assert(port:set_data_bits(rs232.RS232_DATA_8)       == rs232.RS232_ERR_NOERROR)
+	assert(port:set_stop_bits(rs232.RS232_STOP_1)       == rs232.RS232_ERR_NOERROR)
+	assert(port:set_flow_control(rs232.RS232_FLOW_OFF)	== rs232.RS232_ERR_NOERROR)
+end
+
+-- write data from modem (AT PORT)
+function serial.write(serial_port, command)
+	local err, port = rs232.open(serial_port)
+	if err ~= rs232.RS232_ERR_NOERROR then
+		err = {true, "Error opening AT port"}
+		assert(port:close() == rs232.RS232_ERR_NOERROR)
+		return err
+	end
+	configSerial(port)
+
+	local err, len_written = port:write(command  .. "\r\n")
+	if err ~= rs232.RS232_ERR_NOERROR then
+		err = {true, "Error writing AT port"}
+		assert(port:close() == rs232.RS232_ERR_NOERROR)
+		return err
+	end
+
+	err = {false, "OK"}
+	assert(port:close() == rs232.RS232_ERR_NOERROR)
+	return err
+end
+
+-- read data from modem (GNSS PORT)
+function serial.read(serial_port)
+	local err, port = rs232.open(serial_port)
+	if err ~= rs232.RS232_ERR_NOERROR then
+		err = {true, "Error opening GNSS port"}
+		assert(port:close() == rs232.RS232_ERR_NOERROR)
+		return err, ''
+	end
+	configSerial(port)
+
+	local READ_LEN = 1024  -- Read byte form GNSS port
+	local TIMEOUT  = 1000  -- Timeout reading in miliseconds
+
+	local serialData, err, read_data = {}, "", ""
+	while READ_LEN > 0 do
+		err, read_data = port:read(1, TIMEOUT)
+		if err ~= rs232.RS232_ERR_NOERROR then
+			err = {true, "Error reading GNSS port. Updating data or searching for satellites..."}
+			assert(port:close() == rs232.RS232_ERR_NOERROR)
+			return err, ""
+		end
+		if read_data ~= nil then
+			table.insert(serialData, read_data)
+			READ_LEN = READ_LEN - 1
+		end
+	end
+	assert(port:close() == rs232.RS232_ERR_NOERROR)
+
+	err = {false, "OK"}
+	return err, table.concat(serialData)
+end
+
+return serial