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[RM551E-GL in PCIe mode (as opposed to USB)][2]
Iamromulan has a good article on the topic in his wiki:
https://github.com/iamromulan/cellular-modem-wiki/blob/main/quectel/m.2_formfactor.md
RM551E-GL does work well in PCIe EP mode in Topton N100 mini PC connected to M.2 key M slot via M.2 key B adapter with SIM card.
Router runs under OpenWrt snapshot built with Quectel Connect Manager and drivers: https://github.com/FUjr/QModem
Challenging part is getting a host system to perform PCI scan when the modem is ready for it – about 3 seconds after powering up.
With N100 this was achieved by connecting a separate power source to the modem. Thus it turns on first and boots to a state ready for PERST# PCI signal before host is powered up.
Some syste