International audienceSpin torque nano-oscillators are nanoscopic microwave frequency generators which excel due totheir large frequency tuning range and agility for amplitude and frequency modulation. Due to theircompactness, they are regarded as suitable candidates for applications in wireless communications,where cost-effective and complementary metal-oxide semiconductor-compatible standalone devicesare required. In this work, we study the ability of a magnetic-tunnel-junction based spin torquenano-oscillator to respond to a binary input sequence encoded in a square-shaped current pulse forits application as a frequency-shift-keying (FSK) based emitter. We demonstrate that below thelimit imposed by the spin torque nano-oscillator intrinsic relaxation frequency, an agile variationbetween discrete oscillator states is possible. For this kind of devices, we demonstrate FSK up to datarates of 400 Mbps, which is well suited for the application of such oscillators in wireless network