forked from Telos4/LoRa-Workshop
67 lines
1.6 KiB
Python
67 lines
1.6 KiB
Python
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#
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# fhdr: devaddr(4) fctrl(1) fcnt(2) fopts(0..N)
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#
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from .MalformedPacketException import MalformedPacketException
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from .MHDR import MHDR
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#from struct import unpack
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class FHDR:
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def read(self, mac_payload):
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if len(mac_payload) < 7:
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raise MalformedPacketException("Invalid fhdr")
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self.devaddr = mac_payload[:4]
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self.fctrl = mac_payload[4]
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self.fcnt = mac_payload[5:7]
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self.fopts = mac_payload[7:7 + (self.fctrl & 0xf)]
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def create(self, mtype, args):
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self.devaddr = [0x00, 0x00, 0x00, 0x00]
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self.fctrl = 0x00
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if 'fcnt' in args:
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self.fcnt = args['fcnt'].to_bytes(2, 'little')
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else:
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self.fcnt = [0x00, 0x00]
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self.fopts = []
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if mtype == MHDR.UNCONF_DATA_UP or mtype == MHDR.UNCONF_DATA_DOWN or\
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mtype == MHDR.CONF_DATA_UP or mtype == MHDR.CONF_DATA_DOWN:
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self.devaddr = list(reversed(args['devaddr']))
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def length(self):
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return 4 + 1 + 2 + (self.fctrl & 0xf)
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def to_raw(self):
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fhdr = []
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fhdr += self.devaddr
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fhdr += [self.fctrl]
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fhdr += self.fcnt
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if self.fopts:
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fhdr += self.fopts
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return fhdr
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def get_devaddr(self):
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return self.devaddr
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def set_devaddr(self, devaddr):
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self.devaddr = devaddr
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def get_fctrl(self):
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return self.fctrl
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def set_fctrl(self, fctrl):
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self.fctrl = fctrl
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def get_fcnt(self):
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return self.fcnt
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def set_fcnt(self, fcnt):
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self.fcnt = fcnt
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def get_fopts(self):
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return self.fopts
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def set_fopts(self, fopts):
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self.fopts = fopts
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