This might possibly be a bug in the T-mobile portal.

On our application server we get some weird data that our nodes did not send:
44021bea1bea1000b272641128396c776d326d3d312e300d0565703d38363737323430333030383534363503623d55086c743d3836343030ff3c2f3e3b72743d226f6d612e6c776d326d222c3c2f312f303e2c3c2f332f303e2c3c2f342f303e2c3c2f31392f303e2c3c2f352f303e2c3c2f32302f303e

which converted to ASCII is:
Dêê²rd(9lwm2m=1.0
ep=867724030085465b=Ult=86400ÿ</>;rt=“oma.lwm2m”,</1/0>,</3/0>,</4/0>,</19/0>,</5/0>,</20/0>

Can T-mobile engineers check what is happening here ?