BUG? Multiple Tags - User Data Read only on first Tag about python-mercuryapi

[florianhumblot]

Hey, I'm wondering if it could have to do with the information stored in the user bank.

Could you change your read plan to:
set_read_plan(reader.get_antennas(), "GEN2", bank=["user", "epc", "tid"])

And also printing the tag's epc and tid data?

[rasidmusic]

Hey,
I've tried your code:

#!/usr/bin/env python3
from __future__ import print_function
import mercury
reader = mercury.Reader("tmr:///dev/ttyUSB0", baudrate=115200)

reader.set_region("EU3")
reader.set_read_plan(reader.get_antennas(), "GEN2", bank=["user", "epc", "tid"])
for tag in reader.read(timeout=450):
    print("EPC", tag.epc)
    print("Antenna", tag.antenna)
    print("Count", tag.read_count)
    print("RSSI", tag.rssi)
    print("user", tag.user_mem_data)
    print("tid", tag.tid_mem_data)

Result:

EPC b'E200001963020091231027DE'
Antenna 1
Count 6
RSSI -37
user bytearray(b'L18100117\r\n\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
tid bytearray(b'\xe2\x004\x12\x01<\xfd\x00\x0b\xbd&\x80\x10\x03\x0170\r_\xfb\xff\xff\xdcP')
EPC b'E2000017230C01961100AA8E'
Antenna 1
Count 5
RSSI -31
user None
tid None

So the TID of the second Tag is not read. It seems that xyz_mem_data is only read on the first detected tag...

[rasidmusic]

Tried also with adding
print("epc", tag.epc_mem_data)

Same result, shows only EPC of the first detected tag

[gotthardp]

Sorry, I cannot reproduce it. I tried your code with two tags with a single antenna, and the system correctly reads user data from both simultaneously.