added nmea msg parsing

nmea/GSV.py

@@ -0,0 +1,48 @@
+from msg_container import MsgContainer
+from nmea.receiver import Nmea
+
+
+class Gsv(Nmea):
+	class Msg:
+		def __init__(self):
+			self.number_of_msg = None
+			self.seq_number = None
+			self.sat_vis = None
+			self.sat_id = []
+			self.elevation = []
+			self.azimuth = []
+			self.snr = []
+			self.checksum = None
+
+		def __repr__(self):
+			return f"sat_vis: {self.sat_vis}, sat_id: {self.sat_id}, elevation: {self.elevation}, azimuth: {self.azimuth}, snr: {self.snr}"
+
+	def __init__(self, name: str, tid: str):
+		Nmea.__init__(self, name, tid=tid, msg_type="GSV")
+		self.msg = None
+		self.data = Gsv.Msg()
+
+	def on_recv(self, msg: MsgContainer):
+		msg_data = msg.data.decode(encoding="utf-8")
+		data_list = msg_data.split(',')
+		self.msg = data_list[0]
+
+		data = self.data
+		data.number_of_msg = data_list[1]
+		data.seq_number = data_list[2]
+		data.sat_vis = data_list[3]
+
+		data_set_size = 4
+		num_sats_in_msg = int(len(data_list[3:-2])/4)
+		for n in range(num_sats_in_msg):
+			data.sat_id.append(data_list[data_set_size*n+4])
+			data.elevation.append(data_list[data_set_size*n+5])
+			data.azimuth.append(data_list[data_set_size*n+6])
+			data.snr.append(data_list[data_set_size*n+7])
+
+		data.checksum = data_list[data_set_size*(num_sats_in_msg-1)+8]
+
+		if self.data.number_of_msg == self.data.seq_number:
+			print(data)
+			self.data = Gsv.Msg()
+