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1RXS J180408.9--342058 is a low mass X-ray binary hosting a neutron star,which shows X-ray activity at very different mass-accretion regimes, from veryfaint to almost the Eddington luminosity. In this work, we present acomprehensive X-ray study of this source using data from the Neil Gehrels SwiftObservatory, NuSTAR and INTEGRAL/JEM-X. In order to follow the spectralevolution, we analysed the 2015 outburst using Swift data and three Nustarobservations. Besides the canonical hard and soft spectral states, weidentified the rarely observed intermediate state. This was witnessed by theappeareance of the accretion disk emission in the spectrum (at $kT_{\rm disk}$$\sim$0.7 keV) and the simultaneous cooling of the hot corona. In addition, wealso unveiled a hard tail above 30 keV in this state. In the hard state, athermal Comptonization model with two seed photons populations ($kT_{\rms,1}\sim 1.5$ keV and $kT_{\rm s,2}\sim 0.4$ keV, respectively) and a hotComptonising plasma, represents the physically best motivated scenario todescribe the data. We also estimated a reflection fraction below 20% in allstates, while no constraints on the inclination and only lower limits on theinner disk radius could be inferred. Finally, we studied a number of type-IX-ray bursts displayed from the source, one of them at the Eddington limit(observed with JEM-X). Their characteristics, combined with the clockedbehaviour observed during the intermediate state, point out H/He compositionfor the accreted material, which makes unlikely the helium dwarf nature for thecompanion.

New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts and much more