Gammu 1.37.4 / smsd hangs on CentOS 7?

Hi,

We've been running Gammu under CentOS 7 recently - but the sms daemon keeps 
'hanging'.

Symptoms are - it'll start, in the logs you can 'see' it chatting to our 
Huawei USB modem, and running 'gammu-smsd-inject' can be used to send 
messages.

After a 'random' amount of time (20 minutes? - maybe an hour or few) - the 
daemon stops 'noticing' there are SMS's to be sent.

In the logs - we can still see it conversing with the modem (getting signal 
strength info, network info etc.) 'dmesg' etc. confirm the modem isn't 
hanging, or disappearing (i.e. off the USB bus).

At this point 'kill' won't kill the daemon - you can 'kill -9' it - if you 
restart it, it fires up - chats to the modem, see's there's a message to 
send - and sends it. But then randomly 'hangs' again later.

We're running 'CentOS Linux release 7.2.1511' - and I compiled Gammu 1.37.4 
from source.

We're using a very simple conifg - with 'files' queues for in/out SMS'd etc 
(config is below).

Any suggestions? - It doesn't seem to 'crash' - it just stops noticing 
there's stuff to send (and at that point a regular SIGTERM won't quit it - 
only a SIGKILL.

I've found a few posts / articles about this - but nothing with any 
concrete fixes / relevant to the versions I'm running.

Thanks,

-Karl


gammu.cfg:

[gammu]
port = /dev/ttyUSB2
connection = at115200
synchronizetime = yes
logfile = /var/log/gammu-three.log
logformat = textall
debuglevel = 255

StatusFrequency = 0

[smsd]
Service = files
logfile = /var/log/gammu-three.log
debuglevel = 255
InboxPath = /var/spool/sms/inbox-three/
OutboxPath = /var/spool/sms/outbox-three/
SentSMSPath = /var/spool/sms/sent-three/
ErrorSMSPath = /var/spool/sms/error-three/
PhoneID = three
ReceiveFrequency = 15
Receive = true




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