Mark,
master merge done. Hm... maybe I should have increased the
firmware version on this... as we've got new functionality, to
2.2.1?
Following your suggestion I changed the DebugCrash msg to a
more generic and extendable format including the version
information. Example entry:
MP-0 c32,0,6,6,*-OVM-DebugCrash,2013-01-02
18:33:48,0,2.1.1/RT2.5/V2,0,0000,20
Btw: I think the GPS logger could also become a standard
function. Besides producing nice tracks it's useful to test
different antennas and antenna positioning. Maybe the send
rate needs more configurability, it currently logs once per
minute or every 5 seconds if streaming is enabled.
Regards,
Michael
Am 02.01.2013 02:19, schrieb Mark
Webb-Johnson:
Michael,
Not too surprising, and I think your approach is good.
The main limiting factor we have is RAM, and doing any
sort of big buffering at the framework level will be hard.
I think it is better to limit at the module level (as you
have done).
It looks good for a master merge.
Regards, Mark
On 2 Jan, 2013, at 4:37 AM, Michael Balzer wrote:
Mark,
transparent chunk splitting seems to be non-trivial,
so I split my data transfers. Everything's working
fine again, so I'll merge into the master next if
you don't object.
Btw, AT+CIPSEND? gave me 1460 bytes, so that's
supposed to be the size limit we should keep in mind
until we find a better solution.
@Nikolay: please note, that's the total size that
can be sent within one net_msg_start() ...
net_msg_send(), the buffer size (net_scratchpad)
further limits a single MSG line to currently 199
bytes max.
Regards,
Michael
Am 31.12.2012 16:23,
schrieb Michael Balzer:
Mark,
I think I found my link dropping problem: scanning
a diag log I took, I found out CIPSEND will fail
with a plain "ERROR" if the data size exceeds
about 1500 bytes. I guess that's either the SIM908
buffer size or the max network packet size. I
thought the SIM908 would handle dividing data into
packets as needed. The SIM908 manual mentions the
max packet size depends on network status and
should be queried by "AT+CIPSEND?". After the
overrun net_state_activity() will not recognize
"ERROR" to terminate the pending msg, so will run
into the timeout and start a network re-init.
My battery status data exceeds 1500 bytes on first
run and later on if enough cells need updates.
I'll think about how to split up data packets into
multiple CIPSENDs. Would be nice if the net
functions take care of this transparently.
A secondary issue turned up from the diag log: the
SIM908 crashed in the middle of a CIPSEND command
while the module continued to run normally. The
module still thought it's in NET_STATE_READY, so
did not re-initalize the modem. The connection
could then be established on the next CIPSTART,
but the complete INIT stuff had not been done. So
it seems independant SIM908 resets need to be
handled as well, and they can occur anytime. I'll
see if I can solve that too.
Regards,
Michael
Am 30.12.2012 15:42, schrieb Michael Balzer:
I hesitate to merge into
the master because I currently have link /
connectivity problems, especially during
driving. I introduced a GPS logging to optimize
my antenna positions and managed to get some
really nice tracks three days ago, so I don't
think this is related to my changes... but I'm
not 100% sure. I tried different antenna
positions and another GSM network, but the
connection keeps dropping when moving the car,
and GPS position updates need minutes. Could be
weather conditions ...or some tricky race
condition bug?
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Michael Balzer * Paradestr. 8 * D-42107 Wuppertal
Fon 0202 / 272 2201 * Handy 0176 / 206 989 26