Sigfox has announced that it has closed a $160m Series E round of funding, with new investors including Salesforce.com and oil giant Total. It’s big news for the LPWAN (low power wide area networks) specialist, as it continues its US network build-out and signs up more Sigfox Network Partners to expand its global footprint. So what’s next for the company? Wireless Watch’s sister service, Rethink IoT (RIoT – see www.rethink-iot.com to sign up), has had many discussions with Sigfox staffers, and the consensus is that an eventual IPO makes sense, and is more desirable than an all-out acquisition. Floating the company, either in Sigfox’ home country of France or the US, makes a lot of sense, but an acquisition is…