Add DataFrameFactory with the different frame types

modem/data_frame_factory.py

@@ -0,0 +1,67 @@
+from modem_frametypes import FRAME_TYPE as FR_TYPE
+import helpers
+
+class DataFrameFactory:
+
+    def __init__(self, modem_config, modem_state, **data):
+        self.modem_config = modem_config
+        self.modem_state = modem_state
+        self.data = data
+
+        self.myfullcall = f"{modem_config['STATION']['mycall']}-{modem_config['STATION']['myssid']}"
+
+    def build(self):
+        build_method = getattr(self, self.type.name)
+        return build_method()
+
+    def build_ping(self):
+        ping_frame = bytearray(self.length_sig0_frame)
+        ping_frame[:1] = bytes(self.type.value)
+        ping_frame[1:4] = helpers.get_crc_24(self.data['dxcallsign'])
+        ping_frame[4:7] = helpers.get_crc_24(self.myfullcall)
+        ping_frame[7:13] = helpers.callsign_to_bytes(self.myfullcall)
+        return ping_frame
+    
+    def build_cq(self):
+        cq_frame = bytearray(self.length_sig0_frame)
+        cq_frame[:1] = bytes([FR_TYPE.CQ.value])
+        cq_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign)
+        cq_frame[7:11] = helpers.encode_grid(self.mygrid)
+        return cq_frame
+
+    def build_fec_is_writing(self):
+        fec_frame = bytearray(14)
+        fec_frame[:1] = bytes([FR_TYPE.IS_WRITING.value])
+        fec_frame[1:7] = helpers.callsign_to_bytes(mycallsign)
+        return fec_frame
+
+    def build_qrv(self):
+        qrv_frame = bytearray(self.length_sig0_frame)
+        qrv_frame[:1] = bytes([FR_TYPE.QRV.value])
+        qrv_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign)
+        qrv_frame[7:11] = helpers.encode_grid(self.mygrid)
+        qrv_frame[11:12] = helpers.snr_to_bytes(snr)
+        return qrv_frame
+
+    def build_beacon(self):
+        beacon_frame = bytearray(self.length_sig0_frame)
+        beacon_frame[:1] = bytes([FR_TYPE.BEACON.value])
+        beacon_frame[1:7] = helpers.callsign_to_bytes(self.mycallsign)
+        beacon_frame[7:11] = helpers.encode_grid(self.mygrid)
+        return beacon_frame
+    
+    def build_fec_wakeup(self):
+        mode_int_wakeup = codec2.freedv_get_mode_value_by_name("sig0")
+        payload_per_wakeup_frame = modem.get_bytes_per_frame(mode_int_wakeup) - 2
+        fec_wakeup_frame = bytearray(payload_per_wakeup_frame)
+        fec_wakeup_frame[:1] = bytes([FR_TYPE.FEC_WAKEUP.value])
+        fec_wakeup_frame[1:7] = helpers.callsign_to_bytes(mycallsign)
+        fec_wakeup_frame[7:8] = bytes([mode_int])
+        fec_wakeup_frame[8:9] = bytes([1]) # n payload bursts
+        return fec_wakeup_frame
+
+    def build_fec(self):
+        fec_frame = bytearray(payload_per_frame)
+        fec_frame[:1] = bytes([FR_TYPE.FEC.value])
+        fec_frame[1:payload_per_frame] = bytes(payload[:fec_payload_length])
+        return fec_frame