For example, if you have 2000+ groups, then OFMP_GROUP to OFPG_ALL returns a big reply, and the message length overflows uint16_t, where we really need multiple messages.
Coverage remained the same when pulling ffc555b8a12bc9a2ab4cea6c34dedec9d31a5e70 on iHiroakiKawai:multi_multipart into d2e10de1b7fbf85eef40631b8f645756b516fb44 on trema:master.
For example, if you have 2000+ groups, then OFMP_GROUP to OFPG_ALL returns a big reply, and the message length overflows uint16_t, where we really need multiple messages.