HWP-PMX can fail to read value and crash

[ykyohei]

HWP-PMX agents can fail to read value and crash. This was observed when site network was unstable. This can be improved.

socs/socs/agents/hwp_pmx/drivers/PMX_ethernet.py

Line 105 in 91a4306

val = float(self.send_message('meas:volt?'))

2026-01-30T22:22:49+0000 main:0 CRASH: [Failure instance: Traceback: <class 'ValueError'>: could not convert string to float: '+1.16650E+01\n+2.80500E-01'
2026-01-30T22:22:19+0000 Failed to send command to PMX. Check network connection. Retrying in 30 seconds...