原创 WISMO228 Replant Problem List

WISMO228 Replant Problem List:

From Q24plus design to Wismo228, it is not so easy to do replant. There are some different issues between these two modules.

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1. The most bug we experieced is:
TWO UDP SENDING PACKETS HAVE >5MS GUARD TIME.
e.g: If we send packetA followed packetB, The two packet MUST have >  5ms guard time, or the server will get packetA+packetB(One packet).

The udp sending rule:
| sending packetA(enchar 0x03) | >5ms | sending packetB(enchar 0x03) |
Anyway, 5ms is a large time in mcu world.

Q24plus's udp packet guard time is zero.

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2. The wismo program send "+++" to server as network packet.
Sometime, we must send serval "+++" to gsm phase from gprs phase, that's ok. Q24plus have same problem.
But Q24plus willnot send the string "+++" to server as udp packet.

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3. The phase trax between gprs/gsm MUST have gurad time:
We experiece the wismo system crash with WIPDATA cmd. It isnot clear to explain the whole step becasue we have the urgent time_to_market time. We felt that it seemed that it must take about 1~2s(?) to make wismo happy.
Q24plus have perfect show with gprs<->gsm phase.
At the other side, it seemed that the CMDG cmd will need gurad time... We cannot sure...

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4. voice comparesure with q24plus:
It item isnot bug. But it is the trouble for our replant job from q24plus. The 2.2k groug res is very import! Or we cannot make MIC work well.
The spk voice is too weak than q24plus.

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5. The ON/OFF voltage:
The zero level is ON for wismo, different with q24plus also.

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6. Donot touch CSMS with server 1.
Default server mode0 is main flow style for wismo. To set server mode as 1, we found the wismo will autoset CNMI! In most case, it set cnmi with 2,0,0,0,0, that means... we cannot receive anything.

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7. Donot touch WM(?)ECHO.
Error ECHO setting will make mic deaf.

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8. Conclusion:
Wismo228 is not so mature product, specaily comparing with his brother q24plus. Perhaps it isnot unfair to compare the two. Bacause wismo is newer in moudle market with more low price.
Anyway, we wish the Sierra will provide wismo more strong, more safe functions, Ha` Of course, more alluring price... Right?

Allen
GV-TECH
2010.04.12