121 lines
5.0 KiB
Python
121 lines
5.0 KiB
Python
"""
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NMEA2000-Gerät
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- auf dem Bus erkannte Geräte
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- für das eigene Gerät steht initUid() zur Verfügung
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"""
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import time
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import struct
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from . import lookup
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class Device():
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def __init__(self, address):
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# WIP: Felder können sich noch ändern!
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self.address = address # Kann sich zur Laufzeit ändern
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self.lastseen = time.time()
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self.lastpinfo = None # Wann letztes Mal Productinfo erhalten?
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self.lastcinfo = None # Wann letztes Mal Configurationinfo erhalten?
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self.has_cinfo = True # Weitere Abfragen können verhindert werden
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# Device info
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self.NAME = 0 # Wird über Address-Claim gefüllt
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self.uniqueid = None # Z.B. aus der Geräteseriennummer abgeleitet
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self.manufacturercode = 2046 # Open Boat Projects
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self.instance = 0 # default 0
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self.instlower = 0 # 3bit, ISO ECU Instance
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self.instupper = 0 # 5bit, ISO Function Instance
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self.sysinstance = 0 # used with bridged networks, default 0
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self.industrygroup = None
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self.devicefunction = None
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self.deviceclass = None
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# Product info
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self.product = None # Product name
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self.productcode = None # Product code
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self.serial = None
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self.modelvers = None # Hardware Version
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self.softvers = None # Current Software Version
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self.n2kvers = None # NMEA2000 Network Message Database Version
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self.certlevel = None # NMEA2000 Certification Level
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self.loadequiv = None # NMEA2000 LEN
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# Configuration info
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self.instdesc1 = None
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self.instdesc2 = None
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self.manufinfo = None
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# Additional data
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self.customname = None # User defined device name
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def _ISOtime(self, epoch):
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if not epoch:
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return "n/a"
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return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(epoch))
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def initUid(self):
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# Initialize unique id from raspi cpu id and return 21bit value
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with open("/sys/firmware/devicetree/base/serial-number", "r") as f:
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hexid = f.read().rstrip('\x00')
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return int(hexid, 16) & 0x001FFFFF # 21bit mask
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def getNAME(self):
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"""
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NAME is unique on bus
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"""
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data = bytearray()
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data.extend(struct.pack('<I', (self.uniqueid & 0x001fffff) | (self.manufacturercode << 21)))
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data.append((self.instlower & 0x07) | ((self.instupper & 0x1f) << 3))
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data.append(self.devicefunction)
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data.append((self.deviceclass & 0x7f) << 1)
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data.append(0x80 | ((self.industrygroup & 0x07) << 4) | (self.sysinstance & 0x0f))
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return data
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def __str__(self):
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intNAME = int.from_bytes(self.getNAME())
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out = f"Device: {self.address} : '{self.product}'\n"
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out += " NAME: {} ({})\n".format(self.getNAME(), intNAME)
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out += " last seen: {}\n".format(self._ISOtime(self.lastseen))
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out += " Device info\n"
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out += f" Unique ID: {self.uniqueid}\n"
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out += f" Instance: {self.instance} ({self.instupper}/{self.instlower})\n"
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out += f" System instance: {self.sysinstance}\n"
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try:
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devfnname = lookup.devicefunction[self.deviceclass][self.devicefunction]
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except KeyError:
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devfnname = "*key error*"
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out += f" Device function: {devfnname} ({self.devicefunction})\n"
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try:
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devclassname = lookup.deviceclass[self.deviceclass]
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except KeyError:
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devclassname = "*key error*"
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out += f" Device class: {devclassname} ({self.deviceclass})\n"
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try:
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igrpname = lookup.industrygroup[self.industrygroup]
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except KeyError:
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igrpname = "*key error*"
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out += f" Industry group: {igrpname} ({self.industrygroup})\n"
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try:
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manufname = lookup.manufacturer[self.manufacturercode]
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except KeyError:
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manufname = "*key error*"
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out += f" Manufacturer code: {manufname} ({self.manufacturercode})\n"
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out += " Product info at {}\n".format(self._ISOtime(self.lastpinfo))
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out += f" Product Code: {self.productcode}\n"
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out += f" Product: {self.product}\n"
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out += f" Serial: {self.serial}\n"
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out += f" Model Version: {self.modelvers}\n"
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out += f" Software Version: {self.softvers}\n"
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out += f" NMEA2000 Version: {self.n2kvers}\n"
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out += f" Cert-Level: {lookup.certlevel[self.certlevel]} ({self.certlevel})\n"
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out += f" LEN: {self.loadequiv}\n"
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out += " Configuration info at {}\n".format(self._ISOtime(self.lastcinfo))
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if self.has_cinfo:
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out += f" Installation description 1: {self.instdesc1}\n"
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out += f" Installation description 2: {self.instdesc2}\n"
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out += f" Manufacturer info: {self.manufinfo}\n"
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else:
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out += " not available\n"
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return out
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