ELS61 modem not recognized by raspberry pi0WH | Thales IoT Developer Community
May 28, 2018 - 11:32am, 826 views
We are using the Gemalto ELS61 modem and we tested it with ca. 15 Raspberry Pi 0WH. 50% of them are working, the other 50% are not.
Also sometimes they are recognized, but after a while they are not recognized anymore.
We used the `dmesg` and the `lsusb` tool to debug the problem.
Once we have found a device that does not recognize the modem anymore, we tried the same usb port with a USB stick and this one is not recognized either.
Also, we swapped the SD cards of a RPI on which the modem got recognized with another RPi where it was not recognized, so we can rule out any software bugs.
- Could it be a power related problem? That e.g. we have blown a fuse?
- We have ordered the new batch from https://www.sertronics-shop.de with the headers already soldered. The soldering looks good, but was there maybe too much heat applied?
Did anyone encounter similar problems?