add gps

luci-app-gpoint-main/root/usr/share/gpoint/modems/sierra.lua

@@ -0,0 +1,40 @@
+common_path = '/usr/share/gpoint/lib/?.lua;'
+package.path = common_path .. package.path
+
+
+local nmea = require("nmea")
+local serial = require("serial")
+local nixio   = require("nixio.fs")
+
+local sierra = {}
+
+local SIERRA_BEGIN_GPS  = "$GPS_START"
+local SIERRA_END_GPS    = "$GPS_STOP"
+
+-- automatic activation of the NMEA port for data transmission
+function sierra.start(port)
+	local error, resp = true, {warning = {
+							   app = {true, "Port is unavailable. Check the modem connections!"},
+				               locator = {}, 
+				               server = {}
+				               }
+			                }
+	local fport = nixio.glob("/dev/tty[A-Z][A-Z]*")
+	for name in fport do
+		if string.find(name, port) then
+			error, resp = serial.write(port, SIERRA_BEGIN_GPS)
+		end
+	end
+	return error, resp
+end
+-- stop send data to NMEA port
+function sierra.stop(port)
+	error, resp = serial.write(port, SIERRA_END_GPS)
+	return error, resp
+end
+-- get GNSS data for application
+function sierra.getGNSSdata(port)
+	return nmea.getAllData(port)
+end
+	
+return sierra