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Analyze cellular problems using Quectel modules

Analyze cellular problems using Quectel modules

Introduction Previously I have written about connectivity options for IoT devices and today I assume that a cellular technology (e.g. names like GSM, 3G, UMTS, LTE, 4G) has been chosen. Unless you are a big vendor you will end up using a module (instead of a chipset) and either you are curious what the module is doing behind its AT command interface or you are trying to understand a real problem. The following is going to help you or at least…

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Know your tools – mudflap

Know your tools – mudflap

I am currently implementing GSM ARFCN range encoding and I do this by writing the algorithm and a test application. Somehow my test application ended in a segmentation fault after all tests ran. The first thing I did was to use gdb on my application: $ gdb ./si_test (gdb) r … Program received signal SIGSEGV, Segmentation fault. 0x00000043 in ?? () (gdb) bt #0 0x00000043 in ?? () #1 0x00000036 in ?? () #2 0x00000040 in ?? () #3 0x00000046…

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