  We study a class of meromorphic connections $\nabla(Z)$ on $\mathbb{P}^1$,
parametrised by the central charge $Z$ of a stability condition, with values in
a Lie algebra of formal vector fields on a torus. Their definition is motivated
by the work of Gaiotto, Moore and Neitzke on wall-crossing and
three-dimensional field theories. Our main results concern two limits of the
families $\nabla(Z)$ as we rescale the central charge $Z \mapsto RZ$. In the $R
\to 0$ "conformal limit" we recover a version of the connections introduced by
Bridgeland and Toledano Laredo (and so the Joyce holomorphic generating
functions for enumerative invariants), although with a different construction
yielding new explicit formulae. In the $R \to \infty$ "large complex structure"
limit the connections $\nabla(Z)$ make contact with the
Gross-Pandharipande-Siebert approach to wall-crossing based on tropical
geometry. Their flat sections display tropical behaviour, and also encode
certain tropical/relative Gromov-Witten invariants.
