jmalima69 Update: I didn't succeed in programming these devices using the Arduino way of uploading sketches. Either there was a problem my USB-TTL adapter is not compatible with these devices, or there was a problem with the bootloader. Maybe there was no bootloader at all, but there was no mention of that in the product description. Finally I managed to program the device via ISP. Programming via ISP is not so difficult, if you have another Arduino (or an ISP programmer) and brings some advantages. But if you plan to buy these modules beware that you might have problems uploading sketches the usual way.
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