See https://gitlab.alpinelinux.org/alpine/infra/infra/-/issues/10758

diff -upr lua-mqtt-publish-0.3.orig/mqtt/publish.lua lua-mqtt-publish-0.3/mqtt/publish.lua
--- lua-mqtt-publish-0.3.orig/mqtt/publish.lua	2022-06-12 12:09:12.127534562 +0200
+++ lua-mqtt-publish-0.3/mqtt/publish.lua	2022-06-12 12:15:41.038026395 +0200
@@ -1,6 +1,7 @@
 --- @module mosquitto.publish
 
 local mqtt = require("mosquitto")
+local signal = require("posix.signal")
 local publish = {}
 
 function publish.tls_set(cafile, capath, certfile, keyfile)
@@ -51,6 +52,9 @@ function publish.multiple(msgs, hostname
 		       keepalive or publish.keepalive)
 	client:loop_forever()
 	client:destroy()
+
+	-- Workaround for https://github.com/eclipse/mosquitto/issues/2564
+	signal.signal(signal.SIGPIPE, signal.SIG_DFL)
 end
 
 function publish.single(topic, payload, qos, retain, hostname, port, client_id,