![]() I have discovered that most USB dongles with a Qualcomm processor exposed a special diagnostic protocol, called Diag (or DM, or QCDM – for Qualcomm Diagnostic monitor).But I have also discovered that this proprietary protocol was also present inside Android phones (through a device called /dev/diag) and it allowed a couple good things, such as obtaining raw captures of network air traffic or, in older models, reading/writing at arbitrary offsets of the radio chip’s memory (!). Lately, I have been playing with a 3G dongle – a small USB device enabling to connect to the mobile Internet. This helps a wider audience understand these underlying technologies and experiment first hand with these networks. ![]() Please note that this article is written to simplify and abstract many complex technical aspects.
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